feat(decky): self-update without the store + Gaming-Mode launch polish, and ship the Steam Deck docs

Plugin self-update (no Decky store): CI publishes a per-channel manifest.json
({version, immutable per-version artifact, sha256}) beside the zip and bakes
update.json {channel, manifest} into the plugin. main.py `check_update` reads the
installed version from package.json (the value Decky reports — not plugin.json),
fetches the channel manifest, and the frontend shows an "Update to vX" button that
drives Decky Loader's own install RPC (root downloads + SHA-256-verifies + hot-reloads).
CI now stamps a plain-numeric semver (0.3.<run> canary / X.Y.Z stable) into
package.json — a -ciN suffix would mis-order under compare-versions.

Linux client: `--fullscreen` (plus SteamDeck/gamescope env fallback) enters GTK
fullscreen on stream start so Gaming-Mode chrome is hidden; native-mode resolution
falls back to the display's first monitor when the window isn't mapped yet (was
dropping to the 1080p floor — wrong on the Deck's 1280×800); add a confirmed
"Remove saved host" action (KnownHosts::remove_by_fp).

Docs: new docs/steam-deck.md (Decky install/pair/stream/self-update/troubleshooting),
wired into meta.json nav, and cross-linked from clients/install-client/channels. This
is the page docs.punktfunk.unom.io/docs/steam-deck — the website's download link
pointed at it before it existed; committing it makes that link resolve.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

.gitea/workflows/decky.yml

@@ -11,12 +11,18 @@
 #   punktfunk.zip
 #     punktfunk/                  <- single top-level dir == plugin.json "name"
 #       plugin.json   [required]
-#       package.json  [required]
+#       package.json  [required; CI stamps "version" — Decky reads the installed version here]
 #       main.py       [required: python backend]
 #       dist/index.js [required: rollup output]
+#       update.json   [CI-baked {channel, manifest}: where the plugin's self-update check polls]
 #       README.md     (recommended)
 #       LICENSE       [required by the plugin store]
 #
+# SELF-UPDATE (no Decky store): alongside the zip we also publish a tiny per-channel
+# `manifest.json` ({version, artifact=<immutable per-version zip URL>, sha256}). The installed
+# plugin polls it (main.py check_update), and the frontend drives Decky's own install RPC to
+# apply a newer build. See clients/decky/README.md "Updating".
+#
 # REGISTRY_TOKEN: repo Actions secret, a PAT with write:package scope (shared with deb/rpm/docker).
 name: decky
 
@@ -56,20 +62,26 @@ jobs:
           pnpm install --frozen-lockfile
           pnpm run build          # rollup -> clients/decky/dist/index.js
 
-      - name: Version + channel
-        # Tag vX.Y.Z -> X.Y.Z (stable `latest/` alias + Gitea Release); main push -> 0.3.0-ciN.g<sha>
-        # (`canary/` alias). Used for the registry version path + the zip name (the plugin.json
-        # version is the source of truth Decky reads after install — bump it in the release commit).
+      - name: Version + channel + stamp
+        # Tag vX.Y.Z -> X.Y.Z (stable `latest/` alias + Gitea Release); main push -> 0.3.<run>
+        # (`canary/` alias). Decky reads a plugin's INSTALLED version from package.json (NOT
+        # plugin.json), and the plugin's own update check (clients/decky/main.py check_update)
+        # compares against it — so the build version is STAMPED into package.json here (mirrored
+        # into plugin.json for store parity). Canary is a PLAIN numeric semver, never a
+        # `-ci<N>` prerelease: compare-versions orders prerelease identifiers lexically
+        # (ci10 < ci9), which would break update detection; the run number is monotonic.
         working-directory: ${{ gitea.workspace }}
         run: |
-          SHORT=$(echo "$GITHUB_SHA" | cut -c1-8)
           case "$GITHUB_REF" in
             refs/tags/v*) V="${GITHUB_REF_NAME#v}"; ALIAS=latest ;;
-            *)            V="0.3.0-ci${GITHUB_RUN_NUMBER}.g${SHORT}"; ALIAS=canary ;;
+            *)            V="0.3.${GITHUB_RUN_NUMBER}"; ALIAS=canary ;;
           esac
+          BASE="https://$REGISTRY/api/packages/$OWNER/generic/$PACKAGE"
           echo "VERSION=$V" >> "$GITHUB_ENV"
           echo "ALIAS=$ALIAS" >> "$GITHUB_ENV"
+          echo "BASE=$BASE" >> "$GITHUB_ENV"
           echo "decky version $V -> alias '$ALIAS'"
+          VERSION="$V" node -e 'const fs=require("fs");for(const f of ["clients/decky/package.json","clients/decky/plugin.json"]){const j=JSON.parse(fs.readFileSync(f,"utf8"));j.version=process.env.VERSION;fs.writeFileSync(f,JSON.stringify(j,null,2)+"\n");}'
 
       - name: Assemble store-layout zip
         working-directory: ${{ gitea.workspace }}
@@ -89,9 +101,20 @@ jobs:
           chmod 0755 "$DEST/bin/punktfunkrun.sh"
           # Store requires a LICENSE in the plugin root; the project is MIT OR Apache-2.0.
           cp LICENSE-MIT                 "$DEST/LICENSE"
+          # Self-update channel pointer the backend reads (main.py check_update). It points at
+          # THIS channel's manifest.json (published below); that manifest in turn points at the
+          # immutable per-version zip, so its sha256 stays valid across future alias re-uploads.
+          printf '{"channel":"%s","manifest":"%s/%s/manifest.json"}\n' "$ALIAS" "$BASE" "$ALIAS" > "$DEST/update.json"
           ( cd "$STAGE" && zip -r "$RUNNER_TEMP/punktfunk.zip" "$PLUGIN" )
           ls -lh "$RUNNER_TEMP/punktfunk.zip"
           unzip -l "$RUNNER_TEMP/punktfunk.zip"
+          # The update manifest the plugin polls: the immutable per-version artifact + its
+          # sha256 (Decky's installer verifies the download against this hash, aborting on
+          # mismatch — so it MUST be the per-version URL, never the mutable alias).
+          SHA=$(sha256sum "$RUNNER_TEMP/punktfunk.zip" | cut -d' ' -f1)
+          printf '{"version":"%s","artifact":"%s/%s/punktfunk.zip","sha256":"%s"}\n' \
+            "$VERSION" "$BASE" "$VERSION" "$SHA" > "$RUNNER_TEMP/manifest.json"
+          cat "$RUNNER_TEMP/manifest.json"
 
       - name: Publish to the Gitea generic registry
         working-directory: ${{ gitea.workspace }}
@@ -99,18 +122,26 @@ jobs:
           TOKEN: ${{ secrets.REGISTRY_TOKEN }}
         run: |
           BASE="https://$REGISTRY/api/packages/$OWNER/generic/$PACKAGE"
-          # 1) Immutable, versioned URL.
+          # 1) Immutable, versioned URL + its update manifest (the manifest's `artifact` points
+          #    here, so the published sha256 keeps matching what Decky later downloads).
           curl -fsS --user "enricobuehler:$TOKEN" --upload-file "$RUNNER_TEMP/punktfunk.zip" \
             "$BASE/$VERSION/punktfunk.zip"
+          curl -fsS --user "enricobuehler:$TOKEN" --upload-file "$RUNNER_TEMP/manifest.json" \
+            "$BASE/$VERSION/manifest.json"
           echo "published $BASE/$VERSION/punktfunk.zip"
-          # 2) Channel alias (stable release -> latest/, canary main build -> canary/) — the link
-          #    to paste into Decky's "install from URL". The generic registry rejects re-uploading
-          #    an existing version/file (409), so delete the prior alias first (ignore 404 on run #1).
-          curl -fsS -o /dev/null --user "enricobuehler:$TOKEN" -X DELETE \
-            "$BASE/$ALIAS/punktfunk.zip" || true
+          # 2) Channel alias (stable release -> latest/, canary main build -> canary/) — the
+          #    zip is the "install from URL" link; manifest.json is what the installed plugin
+          #    polls for updates. The generic registry rejects re-uploading an existing
+          #    version/file (409), so delete the prior alias copies first (ignore 404 on run #1).
+          for f in punktfunk.zip manifest.json; do
+            curl -fsS -o /dev/null --user "enricobuehler:$TOKEN" -X DELETE "$BASE/$ALIAS/$f" || true
+          done
           curl -fsS --user "enricobuehler:$TOKEN" --upload-file "$RUNNER_TEMP/punktfunk.zip" \
             "$BASE/$ALIAS/punktfunk.zip"
+          curl -fsS --user "enricobuehler:$TOKEN" --upload-file "$RUNNER_TEMP/manifest.json" \
+            "$BASE/$ALIAS/manifest.json"
           echo "install-from-URL link: $BASE/$ALIAS/punktfunk.zip"
+          echo "update manifest:       $BASE/$ALIAS/manifest.json"
 
       - name: Attach zip to the Gitea release (stable tags only)
         if: startsWith(gitea.ref, 'refs/tags/v')

clients/decky/README.md

@@ -45,8 +45,9 @@ Gaming Mode automatically.
 | `src/steam.ts` | Steam-shortcut launch (`AddShortcut` / `SetAppLaunchOptions` / `RunGame`) — the focus-correct stream start. |
 | `src/backend.ts` | Typed `callable` bridges to `main.py`. |
 | `bin/punktfunkrun.sh` | The launch wrapper the Steam shortcut targets (so the window is focusable). |
-| `main.py` | Backend: `discover` / `pair` / `runner_info` / `get_settings` / `set_settings` / `kill_stream`. |
+| `main.py` | Backend: `discover` / `pair` / `runner_info` / `get_settings` / `set_settings` / `kill_stream` / `check_update`. |
 | `plugin.json` | Decky plugin manifest. |
+| `update.json` | CI-baked `{channel, manifest}` — where `check_update()` polls (absent on dev builds). |
 | `decky.pyi` | Type stub for the injected `decky` module (vendored from the template). |
 
 ### Discovery (`discover()`)
@@ -140,6 +141,40 @@ shows up in the Quick Access Menu.
 > [`../../packaging/flatpak/README.md`](../../packaging/flatpak/README.md)) — install that on
 > the Deck too, or the panel's Connect surfaces a `client-not-found` error.
 
+## Updating (self-update, no store)
+
+The plugin updates itself without the official Decky store. CI (`decky.yml`) publishes a tiny
+per-channel `manifest.json` next to the zip in the Gitea registry:
+
+```json
+{"version":"0.3.123","artifact":".../punktfunk-decky/0.3.123/punktfunk.zip","sha256":"…"}
+```
+
+and bakes an `update.json` (`{channel, manifest}`) into the plugin so it knows which channel it was
+installed from. The backend `check_update()` reads the **installed** version from `package.json` —
+the value Decky itself reports (it does **not** read `plugin.json`) — fetches the channel manifest,
+and compares. When a newer build exists the frontend shows an **Update to vX** button that drives
+Decky Loader's own install RPC:
+
+```ts
+window.DeckyBackend.callable("utilities/install_plugin")(artifact, "punktfunk", version, hash, /*UPDATE=*/2)
+```
+
+The loader (root) downloads the immutable per-version zip, **SHA-256-verifies** it against `hash`,
+replaces `~/homebrew/plugins/punktfunk`, and hot-reloads — the unprivileged backend never writes the
+root-owned plugins dir itself. `window.DeckyBackend` / `utilities/install_plugin` are loader
+internals (not `@decky/api`), so every access is guarded; missing them, the button falls back to a
+toast pointing at **Install Plugin from URL**.
+
+> CI stamps a **plain numeric** semver per channel (`0.3.<run>` canary, `X.Y.Z` stable) into
+> `package.json`. Decky's `compare-versions` orders pre-release identifiers lexically (so `ci10 < ci9`)
+> — a `-ciN` suffix would mis-detect updates.
+
+**Optional — native Updates tab:** Decky's store is single-source (a custom store URL *replaces* the
+official catalog), so punktfunk doesn't ship one by default. A user who wants the native update badge
+can point Decky → Settings → **Custom store** at a punktfunk-only store JSON — not recommended if you
+use other plugins, since it hides the official catalog.
+
 ## Limitations / next steps
 
 - **Needs on-Deck validation in Gaming Mode**: the Steam-shortcut launch (`AddShortcut` /

clients/decky/bin/punktfunkrun.sh

@@ -31,4 +31,6 @@ fi
 echo "punktfunkrun: streaming $APPID --connect $PF_HOST" >&2
 # exec so the flatpak client IS the game process — when it exits, Steam ends the "game" and
 # Gaming Mode reclaims focus automatically (no manual refocus needed).
-exec "$FLATPAK" run --arch=x86_64 "$APPID" --connect "$PF_HOST"
+# --fullscreen: present the stream chrome-less and fullscreen (the client also auto-detects the
+# Deck/gamescope env, and ignores the flag harmlessly on older builds that predate it).
+exec "$FLATPAK" run --arch=x86_64 "$APPID" --connect "$PF_HOST" --fullscreen

clients/decky/main.py

@@ -17,6 +17,8 @@ The backend's jobs are the things Steam can't do:
 * **get_settings() / set_settings()** — read/write the flatpak client's stream settings JSON
   (resolution / bitrate / gamepad), so the Deck UI configures the stream the client reads.
 * **kill_stream()** — force-stop a wedged stream (``flatpak kill``).
+* **check_update()** — poll the registry's per-channel ``manifest.json`` and report whether a
+  newer build is available (the frontend then drives Decky's own install RPC to apply it).
 
 The TXT-record keys parsed (``proto`` / ``fp`` / ``pair`` / ``id``) are defined by the host
 advert in ``crates/punktfunk-host/src/discovery.rs``.
@@ -26,7 +28,10 @@ import asyncio
 import json
 import os
 import shutil
+import ssl
 import stat
+import time
+import urllib.request
 from pathlib import Path
 
 import decky
@@ -37,22 +42,99 @@ APP_ID = "io.unom.Punktfunk"
 # Service type advertised by punktfunk/1 hosts (matches NATIVE_SERVICE in the Rust host).
 SERVICE_TYPE = "_punktfunk._udp"
 
-# The flatpak client persists identity / known-hosts / settings under HOME/.config/punktfunk;
-# inside the flatpak sandbox HOME is ~/.var/app/<APP_ID>, so the real on-disk location is this.
-# The backend writes settings here so the (sandboxed) client reads them.
+# The flatpak client persists identity / known-hosts / settings under HOME/.config/punktfunk.
+# The sandbox HOME resolves to the REAL user home (== DECKY_USER_HOME), NOT the per-app
+# ~/.var/app/<APP_ID> dir — verified on-device (`flatpak run … sh -c 'echo $HOME'` prints
+# /home/deck, and the manifest's `--filesystem=~/.config/punktfunk` grants exactly that path;
+# we also pass HOME=DECKY_USER_HOME into `flatpak run`, see _flatpak_env). Pointing here is what
+# lets plugin settings actually reach the client AND lets us read the client's known-hosts to
+# tell whether THIS device is already paired with a given host.
 def _client_config_dir() -> Path:
-    return Path(decky.DECKY_USER_HOME) / ".var" / "app" / APP_ID / ".config" / "punktfunk"
+    return Path(decky.DECKY_USER_HOME) / ".config" / "punktfunk"
 
 
 def _settings_path() -> Path:
     return _client_config_dir() / "client-gtk-settings.json"
 
 
+def _paired_fingerprints() -> set[str]:
+    """Host cert fingerprints (lowercase hex) this client has PIN-paired, from the client's
+    known-hosts store. Keyed by fingerprint so it survives a host changing IP address."""
+    try:
+        data = json.loads((_client_config_dir() / "client-known-hosts.json").read_text())
+    except (OSError, json.JSONDecodeError):
+        return set()
+    hosts = data.get("hosts", []) if isinstance(data, dict) else []
+    return {
+        h["fp_hex"].lower()
+        for h in hosts
+        if isinstance(h, dict) and h.get("paired") and isinstance(h.get("fp_hex"), str)
+    }
+
+
 def _runner_path() -> str:
     """Absolute path to the launch wrapper shipped with the plugin (bin/punktfunkrun.sh)."""
     return str(Path(decky.DECKY_PLUGIN_DIR) / "bin" / "punktfunkrun.sh")
 
 
+# ----------------------------------------------------------------------------------------
+# Self-update check (no Decky store). The plugin is distributed via "Install Plugin from
+# URL" pointing at our Gitea generic registry, so the official store never sees it and
+# can't offer updates. Instead the backend polls a tiny per-channel ``manifest.json`` the
+# CI publishes next to the zip, compares it to the installed version, and the frontend
+# offers a one-tap update that drives Decky's own (root, privileged) install RPC. The
+# channel + manifest URL are baked into ``update.json`` by CI (.gitea/workflows/decky.yml);
+# a dev/sideload build has no ``update.json`` and update checks are simply disabled.
+_UPDATE_TTL_S = 1800.0  # cache a successful check for 30 min (the QAM remounts often)
+_update_cache: dict = {"at": 0.0, "data": None}
+
+
+def _update_config() -> dict:
+    """The CI-baked ``{channel, manifest}`` next to the plugin (absent on dev builds)."""
+    try:
+        return json.loads((Path(decky.DECKY_PLUGIN_DIR) / "update.json").read_text())
+    except (OSError, json.JSONDecodeError):
+        return {}
+
+
+def _installed_version() -> str:
+    """The version Decky itself reports for this plugin — it reads ``package.json`` (NOT
+    plugin.json), so the CI stamps the build version there."""
+    try:
+        pkg = json.loads((Path(decky.DECKY_PLUGIN_DIR) / "package.json").read_text())
+        return str(pkg.get("version", "0.0.0"))
+    except (OSError, json.JSONDecodeError):
+        return "0.0.0"
+
+
+def _semver_tuple(v: str) -> tuple[int, int, int]:
+    """A tolerant (major, minor, patch) tuple for ``>`` comparison. We control the version
+    format (plain numeric ``X.Y.Z`` on both channels), so leading-int-per-component is
+    enough; any pre-release suffix is dropped before comparing."""
+    parts: list[int] = []
+    for comp in str(v).split("-", 1)[0].split(".")[:3]:
+        digits = ""
+        for ch in comp:
+            if ch.isdigit():
+                digits += ch
+            else:
+                break
+        parts.append(int(digits) if digits else 0)
+    while len(parts) < 3:
+        parts.append(0)
+    return (parts[0], parts[1], parts[2])
+
+
+def _fetch_json(url: str, timeout: float = 8.0) -> dict:
+    """Blocking HTTPS GET of a small JSON document (run in an executor)."""
+    req = urllib.request.Request(
+        url, headers={"Accept": "application/json", "User-Agent": "punktfunk-decky"}
+    )
+    ctx = ssl.create_default_context()
+    with urllib.request.urlopen(req, timeout=timeout, context=ctx) as resp:
+        return json.loads(resp.read().decode("utf-8", errors="replace"))
+
+
 def _flatpak() -> str | None:
     return shutil.which("flatpak") or (
         "/usr/bin/flatpak" if Path("/usr/bin/flatpak").exists() else None
@@ -179,6 +261,13 @@ class Plugin:
         if stderr:
             decky.logger.debug("avahi-browse stderr: %s", stderr.decode(errors="replace"))
         hosts = _parse_avahi_browse(stdout.decode(errors="replace"))
+        # Mark which hosts THIS device has already paired (by cert fingerprint), so the UI can
+        # show "Stream" instead of "Pair" — the mDNS `pair` field is the host's policy, not our
+        # per-device pairing state.
+        paired = _paired_fingerprints()
+        for h in hosts:
+            fp = h.get("fp") or ""
+            h["paired"] = bool(fp) and fp.lower() in paired
         decky.logger.info("discovered %d punktfunk host(s)", len(hosts))
         return hosts
 
@@ -279,6 +368,54 @@ class Plugin:
             return {"ok": False}
         return {"ok": True}
 
+    async def check_update(self, force: bool = False) -> dict:
+        """Is a newer build available in our registry? Compares the installed version
+        (``package.json``) against the per-channel ``manifest.json`` the CI publishes, and
+        returns everything the frontend needs to drive Decky's install RPC. Non-fatal: any
+        failure (no channel baked in, network down) returns ``update_available: False``.
+        """
+        current = _installed_version()
+        cfg = _update_config()
+        result = {
+            "current": current,
+            "latest": current,
+            "artifact": "",
+            "hash": "",
+            "channel": str(cfg.get("channel", "")),
+            "update_available": False,
+        }
+
+        manifest_url = cfg.get("manifest")
+        if not manifest_url:
+            result["error"] = "update-channel-unknown"  # dev / sideloaded build
+            return result
+
+        now = time.monotonic()
+        cached = _update_cache["data"]
+        if not force and cached and (now - _update_cache["at"]) < _UPDATE_TTL_S:
+            return cached
+
+        try:
+            loop = asyncio.get_running_loop()
+            manifest = await loop.run_in_executor(None, _fetch_json, manifest_url)
+        except Exception as exc:  # noqa: BLE001
+            decky.logger.warning("update check failed: %s", exc)
+            result["error"] = "fetch-failed"
+            return result  # transient — don't cache, retry next open
+
+        latest = str(manifest.get("version", current))
+        result["latest"] = latest
+        result["artifact"] = str(manifest.get("artifact", ""))
+        result["hash"] = str(manifest.get("sha256", ""))
+        result["update_available"] = bool(result["artifact"]) and (
+            _semver_tuple(latest) > _semver_tuple(current)
+        )
+        if result["update_available"]:
+            decky.logger.info("update available: %s -> %s (%s)", current, latest, result["channel"])
+        _update_cache["at"] = now
+        _update_cache["data"] = result
+        return result
+
     # ---- Decky lifecycle ----
 
     async def _main(self):

clients/decky/src/backend.ts

@@ -5,8 +5,9 @@ export interface Host {
   name: string;
   host: string;
   port: number;
-  pair: string; // "required" | "optional"
+  pair: string; // "required" | "optional" — the HOST's policy
   fp: string;
+  paired: boolean; // whether THIS device has already PIN-paired this host (by fingerprint)
 }
 
 export interface PairResult {
@@ -32,6 +33,16 @@ export interface StreamSettings {
   mic_enabled: boolean;
 }
 
+export interface UpdateInfo {
+  current: string; // installed version (package.json)
+  latest: string; // newest version in our registry for this channel
+  artifact: string; // immutable zip URL Decky should install
+  hash: string; // sha256 of that zip (Decky verifies it)
+  channel: string; // "latest" (stable) | "canary"
+  update_available: boolean;
+  error?: string; // "update-channel-unknown" (dev build) | "fetch-failed"
+}
+
 export const discover = callable<[], Host[]>("discover");
 export const pair = callable<
   [host: string, port: number, pin: string, name: string],
@@ -43,3 +54,4 @@ export const setSettings = callable<[settings: StreamSettings], { ok: boolean }>
   "set_settings",
 );
 export const killStream = callable<[], { ok: boolean }>("kill_stream");
+export const checkUpdate = callable<[force: boolean], UpdateInfo>("check_update");

clients/decky/src/index.tsx

@@ -10,12 +10,22 @@ import {
   PanelSectionRow,
   SliderField,
   Spinner,
+  Tabs,
   ToggleField,
   showModal,
   staticClasses,
 } from "@decky/ui";
 import { definePlugin, routerHook, toaster } from "@decky/api";
-import { FC, useCallback, useEffect, useState } from "react";
+import {
+  Component,
+  CSSProperties,
+  ErrorInfo,
+  FC,
+  ReactNode,
+  useCallback,
+  useEffect,
+  useState,
+} from "react";
 import {
   FaTv,
   FaSyncAlt,
@@ -23,19 +33,130 @@ import {
   FaLockOpen,
   FaPlay,
   FaArrowLeft,
+  FaDownload,
 } from "react-icons/fa";
 import {
   discover,
   getSettings,
   pair,
   setSettings,
+  checkUpdate,
   Host,
   StreamSettings,
+  UpdateInfo,
 } from "./backend";
 import { launchStream } from "./steam";
 
 const ROUTE = "/punktfunk";
 
+// Decky Loader exposes its already-authenticated WSRouter as a global. This is NOT part of
+// @decky/api (it's a loader internal), so we treat it as optional and guard every use — on a
+// loader without it we fall back to manual "Install Plugin from URL". We use it to drive
+// Decky's own privileged install path (the root loader does the download + SHA-256 verify +
+// extract + hot-reload), which is the only way a plugin can update itself: ~/homebrew/plugins
+// is root-owned, so our unprivileged backend can't swap its own files.
+declare global {
+  interface Window {
+    DeckyBackend?: {
+      callable: (route: string) => (...args: unknown[]) => Promise<unknown>;
+    };
+  }
+}
+
+// PluginInstallType.UPDATE in decky-loader's browser.py (INSTALL=0/REINSTALL=1/UPDATE=2/…).
+const INSTALL_TYPE_UPDATE = 2;
+
+// ----------------------------------------------------------------------------------------
+// Error boundary — contains ANY render failure in our UI so a single bad render can never take
+// down the whole Quick Access "Decky" section (Decky's tab-level boundary shows the generic
+// "Something went wrong while displaying this content" for the entire tab when one plugin
+// throws). The realistic trigger is a future Steam client update that makes a @decky/ui
+// component resolve to `undefined` (React then throws "Element type is invalid"). The fallback
+// is built from ONLY plain DOM elements + inline styles, so it cannot itself depend on a
+// (possibly broken) Steam-internal component — it is guaranteed to render.
+// ----------------------------------------------------------------------------------------
+class PluginErrorBoundary extends Component<
+  { children: ReactNode },
+  { error: Error | null }
+> {
+  state: { error: Error | null } = { error: null };
+
+  static getDerivedStateFromError(error: Error) {
+    return { error };
+  }
+
+  componentDidCatch(error: Error, info: ErrorInfo) {
+    // Surface it for diagnosis, but never rethrow — containment is the whole point.
+    // eslint-disable-next-line no-console
+    console.error("[punktfunk] contained UI render error:", error, info?.componentStack);
+  }
+
+  render() {
+    const { error } = this.state;
+    if (!error) return this.props.children;
+    return (
+      <div style={{ padding: "1em", lineHeight: 1.45 }}>
+        <div style={{ fontWeight: "bold", marginBottom: "0.4em" }}>
+          punktfunk couldn’t draw this view
+        </div>
+        <div style={{ opacity: 0.8, marginBottom: "0.6em" }}>
+          The plugin hit a display error — your Steam Deck is fine. Reload punktfunk from
+          Decky&apos;s plugin list, or update the plugin.
+        </div>
+        <div
+          style={{
+            opacity: 0.55,
+            fontFamily: "monospace",
+            fontSize: "0.8em",
+            wordBreak: "break-word",
+          }}
+        >
+          {String(error?.message ?? error)}
+        </div>
+      </div>
+    );
+  }
+}
+
+// Checks our registry for a newer build on mount (the backend caches + is non-fatal offline).
+function useUpdate() {
+  const [info, setInfo] = useState<UpdateInfo | null>(null);
+  useEffect(() => {
+    void checkUpdate(false)
+      .then(setInfo)
+      .catch(() => {});
+  }, []);
+  return info;
+}
+
+async function applyUpdate(info: UpdateInfo) {
+  try {
+    const backend = window.DeckyBackend;
+    if (backend?.callable) {
+      // Fire-and-forget: the loader reinstalls + reloads THIS plugin, tearing the panel down
+      // before any result could arrive — so never await it. Decky shows its own confirm prompt.
+      void backend.callable("utilities/install_plugin")(
+        info.artifact,
+        "punktfunk",
+        info.latest,
+        info.hash,
+        INSTALL_TYPE_UPDATE,
+      );
+      toaster.toast({
+        title: "punktfunk",
+        body: `Updating to v${info.latest}… confirm the Decky prompt.`,
+      });
+      return;
+    }
+  } catch {
+    // fall through to the manual path
+  }
+  toaster.toast({
+    title: "punktfunk",
+    body: "Update from Decky → Developer → Install Plugin from URL.",
+  });
+}
+
 // ----------------------------------------------------------------------------------------
 // Discovery hook — shared by the QAM panel and the full page.
 // ----------------------------------------------------------------------------------------
@@ -255,20 +376,24 @@ const SettingsSection: FC = () => {
 // One host row on the full page.
 // ----------------------------------------------------------------------------------------
 const HostRow: FC<{ host: Host }> = ({ host }) => {
-  const pairRequired = host.pair === "required";
+  // The host's policy is `pair=required`, but if THIS device is already paired we don't need to
+  // pair again — show it as trusted and go straight to Stream.
+  const needsPair = host.pair === "required" && !host.paired;
   return (
     <Field
       label={
         <span style={{ display: "inline-flex", alignItems: "center", gap: "0.4em" }}>
-          {pairRequired ? <FaLock /> : <FaLockOpen />}
+          {needsPair ? <FaLock /> : <FaLockOpen />}
           {host.name}
         </span>
       }
-      description={`${host.host}:${host.port}${pairRequired ? " · pairing required" : ""}`}
+      description={`${host.host}:${host.port}${
+        needsPair ? " · pairing required" : host.paired ? " · paired" : ""
+      }`}
       childrenContainerWidth="max"
     >
       <Focusable style={{ display: "flex", gap: "0.5em" }}>
-        {pairRequired && (
+        {needsPair && (
           <DialogButton
             style={{ minWidth: "5em" }}
             onClick={() =>
@@ -288,52 +413,129 @@ const HostRow: FC<{ host: Host }> = ({ host }) => {
 };
 
 // ----------------------------------------------------------------------------------------
-// The fullscreen page (registered as the /punktfunk route).
+// The fullscreen page (registered as the /punktfunk route) — a tabbed Hosts / Settings view.
 // ----------------------------------------------------------------------------------------
+
+// Bottom inset so the last control clears Gaming Mode's footer hint bar. Routed pages render
+// *under* that bar otherwise — that's why the last Stream-settings row was getting hidden. The
+// value is generous on purpose (and harmless where the tab area already insets); tune to taste.
+const SAFE_BOTTOM = "80px";
+
+// Each tab is its own scroll area so long content is always reachable above the footer.
+const tabScroll: CSSProperties = {
+  height: "100%",
+  overflowY: "auto",
+  padding: "0.5em 2.5em",
+  paddingBottom: SAFE_BOTTOM,
+  boxSizing: "border-box",
+};
+
+const HostsTab: FC<{
+  hosts: Host[];
+  scanning: boolean;
+  refresh: () => void;
+}> = ({ hosts, scanning, refresh }) => (
+  <div style={tabScroll}>
+    <Field
+      label="Discover"
+      description={
+        scanning
+          ? "Scanning the LAN…"
+          : `${hosts.length} host${hosts.length === 1 ? "" : "s"} on your network`
+      }
+      childrenContainerWidth="max"
+      bottomSeparator={hosts.length ? "standard" : "none"}
+    >
+      <DialogButton style={{ minWidth: "8em" }} disabled={scanning} onClick={refresh}>
+        {scanning ? (
+          <Spinner style={{ height: "1em", marginRight: "0.5em" }} />
+        ) : (
+          <FaSyncAlt style={{ marginRight: "0.5em" }} />
+        )}
+        {scanning ? "Scanning…" : "Refresh"}
+      </DialogButton>
+    </Field>
+
+    {hosts.length === 0 && !scanning && (
+      <Field
+        focusable={false}
+        description="No punktfunk hosts found. Make sure a host is running on the same network."
+      >
+        No hosts found
+      </Field>
+    )}
+    {hosts.map((h) => (
+      <HostRow key={h.fp || `${h.host}:${h.port}`} host={h} />
+    ))}
+  </div>
+);
+
+const SettingsTab: FC = () => (
+  <div style={tabScroll}>
+    <SettingsSection />
+  </div>
+);
+
 const PunktfunkPage: FC = () => {
   const { hosts, scanning, refresh } = useHosts();
+  const update = useUpdate();
+  const [tab, setTab] = useState("hosts");
 
   return (
     <div
       style={{
         marginTop: "40px",
         height: "calc(100% - 40px)",
-        overflowY: "auto",
-        padding: "0 2.5em 2.5em",
+        display: "flex",
+        flexDirection: "column",
       }}
     >
-      <Focusable style={{ display: "flex", alignItems: "center", gap: "1em", marginBottom: "1em" }}>
+      <Focusable
+        style={{
+          display: "flex",
+          alignItems: "center",
+          gap: "1em",
+          padding: "0 2.5em",
+          marginBottom: "0.4em",
+          flexShrink: 0,
+        }}
+      >
         <DialogButton
-          style={{ width: "3em", minWidth: "3em" }}
+          style={{ width: "3em", minWidth: "3em", padding: 0 }}
           onClick={() => Navigation.NavigateBack()}
         >
           <FaArrowLeft />
         </DialogButton>
-        <div className={staticClasses.Title} style={{ flex: 1 }}>
+        <div className={staticClasses?.Title} style={{ flex: 1, margin: 0 }}>
           punktfunk
         </div>
-        <DialogButton style={{ width: "10em" }} disabled={scanning} onClick={refresh}>
-          {scanning ? (
-            <Spinner style={{ height: "1em", marginRight: "0.5em" }} />
-          ) : (
-            <FaSyncAlt style={{ marginRight: "0.5em" }} />
-          )}
-          {scanning ? "Scanning…" : "Refresh"}
-        </DialogButton>
+        {update?.update_available && (
+          <DialogButton style={{ minWidth: "9em" }} onClick={() => applyUpdate(update)}>
+            <FaDownload style={{ marginRight: "0.4em" }} />
+            Update v{update.latest}
+          </DialogButton>
+        )}
       </Focusable>
 
-      <div style={{ fontSize: "1.1em", fontWeight: "bold", margin: "0.5em 0" }}>Hosts</div>
-      {hosts.length === 0 && !scanning && (
-        <Field focusable={false}>No hosts discovered on the LAN.</Field>
-      )}
-      {hosts.map((h) => (
-        <HostRow key={h.fp || `${h.host}:${h.port}`} host={h} />
-      ))}
-
-      <div style={{ fontSize: "1.1em", fontWeight: "bold", margin: "1.5em 0 0.5em" }}>
-        Stream settings
+      <div style={{ flex: 1, minHeight: 0 }}>
+        <Tabs
+          activeTab={tab}
+          onShowTab={(id: string) => setTab(id)}
+          autoFocusContents
+          tabs={[
+            {
+              id: "hosts",
+              title: "Hosts",
+              content: <HostsTab hosts={hosts} scanning={scanning} refresh={refresh} />,
+            },
+            {
+              id: "settings",
+              title: "Settings",
+              content: <SettingsTab />,
+            },
+          ]}
+        />
       </div>
-      <SettingsSection />
     </div>
   );
 };
@@ -343,9 +545,25 @@ const PunktfunkPage: FC = () => {
 // ----------------------------------------------------------------------------------------
 const QamPanel: FC = () => {
   const { hosts, scanning, refresh } = useHosts();
+  const update = useUpdate();
 
   return (
     <>
+      {update?.update_available && (
+        <PanelSection title="Update">
+          <PanelSectionRow>
+            <ButtonItem
+              layout="below"
+              onClick={() => applyUpdate(update)}
+              label={`v${update.current} → v${update.latest}`}
+            >
+              <FaDownload style={{ marginRight: "0.5em" }} />
+              Update punktfunk
+            </ButtonItem>
+          </PanelSectionRow>
+        </PanelSection>
+      )}
+
       <PanelSection title="punktfunk">
         <PanelSectionRow>
           <ButtonItem
@@ -378,25 +596,25 @@ const QamPanel: FC = () => {
           </PanelSectionRow>
         )}
         {hosts.map((h) => {
-          const pairRequired = h.pair === "required";
+          const needsPair = h.pair === "required" && !h.paired;
           return (
             <PanelSectionRow key={h.fp || `${h.host}:${h.port}`}>
               <ButtonItem
                 layout="below"
                 onClick={() =>
-                  pairRequired
+                  needsPair
                     ? showModal(<PairModal host={h} onPaired={() => startStream(h)} />)
                     : startStream(h)
                 }
                 label={
                   <span style={{ display: "inline-flex", alignItems: "center", gap: "0.4em" }}>
-                    {pairRequired ? <FaLock /> : <FaLockOpen />}
+                    {needsPair ? <FaLock /> : <FaLockOpen />}
                     {h.name}
                   </span>
                 }
-                description={`${h.host}:${h.port}`}
+                description={`${h.host}:${h.port}${h.paired ? " · paired" : ""}`}
               >
-                {pairRequired ? "Pair & Stream" : "Stream"}
+                {needsPair ? "Pair & Stream" : "Stream"}
               </ButtonItem>
             </PanelSectionRow>
           );
@@ -406,12 +624,25 @@ const QamPanel: FC = () => {
   );
 };
 
+// Full page behind the boundary — registered as the /punktfunk route.
+const PunktfunkRoute: FC = () => (
+  <PluginErrorBoundary>
+    <PunktfunkPage />
+  </PluginErrorBoundary>
+);
+
 export default definePlugin(() => {
-  routerHook.addRoute(ROUTE, PunktfunkPage, { exact: true });
+  routerHook.addRoute(ROUTE, PunktfunkRoute, { exact: true });
   return {
     name: "punktfunk",
-    titleView: <div className={staticClasses.Title}>punktfunk</div>,
-    content: <QamPanel />,
+    // `staticClasses?.Title` is guarded so a future client that drops the export can't throw
+    // at plugin-load time (an error boundary only catches render-time, not load-time, errors).
+    titleView: <div className={staticClasses?.Title}>punktfunk</div>,
+    content: (
+      <PluginErrorBoundary>
+        <QamPanel />
+      </PluginErrorBoundary>
+    ),
     icon: <FaTv />,
     onDismount() {
       routerHook.removeRoute(ROUTE);

clients/decky/src/steam.ts

@@ -24,12 +24,31 @@ declare const SteamClient: {
     SetShortcutExe(appId: number, exe: string): void;
     SetShortcutStartDir(appId: number, dir: string): void;
     SetAppLaunchOptions(appId: number, options: string): void;
-    SetAppHidden(appId: number, hidden: boolean): void;
     RunGame(gameId: string, _unused: string, _i: number, _j: number): void;
     TerminateApp(gameId: string, _b: boolean): void;
   };
 };
 
+// Steam removed `SteamClient.Apps.SetAppHidden`. Hiding a non-Steam shortcut now goes through
+// `collectionStore.SetAppsAsHidden([appId], true)` — but that looks the app up in appStore, which
+// only registers a freshly-created shortcut a moment later (calling it immediately throws on a
+// null overview). So hiding is BEST-EFFORT + DEFERRED and must NEVER block the launch.
+declare const collectionStore:
+  | { SetAppsAsHidden?: (appIds: number[], hidden: boolean) => void }
+  | undefined;
+
+function hideShortcut(appId: number): void {
+  const attempt = () => {
+    try {
+      collectionStore?.SetAppsAsHidden?.([appId], true);
+    } catch {
+      /* overview not registered yet, or the API changed — cosmetic, ignore */
+    }
+  };
+  attempt(); // succeeds immediately for an already-registered (reused) shortcut
+  setTimeout(attempt, 2500); // fresh shortcut: retry once its app overview lands
+}
+
 const SHORTCUT_NAME = "punktfunk";
 
 // The 64-bit "gameid" RunGame wants, derived from a 32-bit non-Steam shortcut appId: the
@@ -88,7 +107,8 @@ async function ensureShortcut(): Promise<number> {
   );
   SteamClient.Apps.SetShortcutName(appId, SHORTCUT_NAME);
   // Hide it from the library — it's an implementation detail, launched programmatically.
-  SteamClient.Apps.SetAppHidden(appId, true);
+  // Best-effort + deferred (see hideShortcut); never let it block the launch.
+  hideShortcut(appId);
   rememberAppId(appId);
   return appId;
 }

clients/linux/src/app.rs

@@ -22,6 +22,8 @@ struct App {
     gamepad: crate::gamepad::GamepadService,
     /// One session at a time — ignore connects while one is starting/running.
     busy: std::cell::Cell<bool>,
+    /// Steam Deck / Gaming-Mode launch: fullscreen the window (chrome-less) when a stream starts.
+    fullscreen: bool,
 }
 
 impl App {
@@ -56,6 +58,20 @@ fn arg_value(flag: &str) -> Option<String> {
         .filter(|v| !v.starts_with("--"))
 }
 
+/// True if argv contains `flag` (a valueless switch).
+fn arg_flag(flag: &str) -> bool {
+    std::env::args().any(|a| a == flag)
+}
+
+/// Run the stream fullscreen with no window chrome — the Steam Deck / Gaming-Mode launch path.
+/// The Decky wrapper passes `--fullscreen`; we also honor the Deck/gamescope env as a fallback
+/// so a manual launch under Gaming Mode does the right thing too.
+fn fullscreen_mode() -> bool {
+    arg_flag("--fullscreen")
+        || std::env::var_os("SteamDeck").is_some()
+        || std::env::var_os("GAMESCOPE_WAYLAND_DISPLAY").is_some()
+}
+
 /// Run the SPAKE2 PIN ceremony without a GTK window and persist the verified host to the
 /// known-hosts store as paired, so a later `--connect` connects silently. Same identity
 /// store the streaming path uses (same binary), so pairing here makes the stream work.
@@ -161,6 +177,7 @@ fn build_ui(gtk_app: &adw::Application) {
         identity,
         gamepad: crate::gamepad::GamepadService::start(),
         busy: std::cell::Cell::new(false),
+        fullscreen: fullscreen_mode(),
     });
 
     let hosts_page = crate::ui_hosts::new(
@@ -443,11 +460,19 @@ fn resolve_mode(app: &App) -> punktfunk_core::config::Mode {
         refresh_hz: s.refresh_hz,
     };
     if mode.width == 0 || mode.refresh_hz == 0 {
+        // Prefer the monitor the window is on; fall back to the display's first monitor. On a
+        // `--connect` launch the window may not be mapped yet when this runs, and without the
+        // fallback we'd drop to the 1920×1080 floor below — wrong on the Deck (1280×800).
         let monitor = app
             .window
             .surface()
             .zip(gdk::Display::default())
-            .and_then(|(surf, d)| d.monitor_at_surface(&surf));
+            .and_then(|(surf, d)| d.monitor_at_surface(&surf))
+            .or_else(|| {
+                gdk::Display::default()
+                    .and_then(|d| d.monitors().item(0))
+                    .and_then(|o| o.downcast::<gdk::Monitor>().ok())
+            });
         if let Some(m) = monitor {
             let geo = m.geometry();
             let scale = m.scale_factor().max(1);
@@ -540,6 +565,12 @@ fn start_session(app: Rc<App>, req: ConnectRequest, pin: Option<[u8; 32]>) {
                         &title,
                     );
                     app.nav.push(&p.page);
+                    // Steam Deck / Gaming Mode: gamescope fullscreens the window but GTK doesn't
+                    // know it, so its header bar stays drawn. Enter GTK fullscreen explicitly —
+                    // the stream page's `connect_fullscreened_notify` then hides all chrome.
+                    if app.fullscreen {
+                        app.window.fullscreen();
+                    }
                     page = Some(p);
                 }
                 SessionEvent::Stats(s) => {

clients/linux/src/trust.rs

@@ -90,6 +90,14 @@ impl KnownHosts {
         self.hosts.iter().find(|h| h.addr == addr && h.port == port)
     }
 
+    /// Forget the entry with this fingerprint. Returns true if one was removed (the user
+    /// will have to pair/trust again to reconnect).
+    pub fn remove_by_fp(&mut self, fp_hex: &str) -> bool {
+        let before = self.hosts.len();
+        self.hosts.retain(|h| h.fp_hex != fp_hex);
+        self.hosts.len() != before
+    }
+
     /// Insert or refresh an entry, keyed by fingerprint. `paired` only ever upgrades
     /// (a later TOFU connect must not demote a PIN-paired host).
     pub fn upsert(&mut self, entry: KnownHost) {

clients/linux/src/ui_hosts.rs

@@ -181,6 +181,52 @@ pub fn new(
                     // pinned connect; TOFU eligibility is irrelevant.
                     pair_optional: false,
                 };
+                // Forget this host (drops the pinned fingerprint — a later connect re-pairs).
+                // Confirmed first, since it's destructive and a misclick on the Deck is easy.
+                let remove_btn = gtk::Button::from_icon_name("user-trash-symbolic");
+                remove_btn.set_tooltip_text(Some("Remove saved host"));
+                remove_btn.set_valign(gtk::Align::Center);
+                remove_btn.add_css_class("flat");
+                {
+                    let fp = k.fp_hex.clone();
+                    let name = k.name.clone();
+                    let saved_list = saved_list.clone();
+                    let saved_label = saved_label.clone();
+                    let row = row.clone();
+                    remove_btn.connect_clicked(move |_| {
+                        let dialog = adw::AlertDialog::new(
+                            Some("Remove saved host?"),
+                            Some(&format!(
+                                "Forget “{name}”? You'll need to pair (or trust) it again to reconnect."
+                            )),
+                        );
+                        dialog.add_responses(&[("cancel", "Cancel"), ("remove", "Remove")]);
+                        dialog.set_response_appearance(
+                            "remove",
+                            adw::ResponseAppearance::Destructive,
+                        );
+                        dialog.set_default_response(Some("cancel"));
+                        dialog.set_close_response("cancel");
+                        {
+                            // Scoped clones for the response handler so `row` survives for present().
+                            let fp = fp.clone();
+                            let saved_list = saved_list.clone();
+                            let saved_label = saved_label.clone();
+                            let row = row.clone();
+                            dialog.connect_response(Some("remove"), move |_, _| {
+                                let mut known = KnownHosts::load();
+                                known.remove_by_fp(&fp);
+                                let _ = known.save();
+                                saved_list.remove(&row);
+                                let empty = known.hosts.is_empty();
+                                saved_list.set_visible(!empty);
+                                saved_label.set_visible(!empty);
+                            });
+                        }
+                        dialog.present(Some(&row));
+                    });
+                }
+                row.add_suffix(&remove_btn);
                 let speed_btn = gtk::Button::from_icon_name("network-transmit-receive-symbolic");
                 speed_btn.set_tooltip_text(Some("Test network speed"));
                 speed_btn.set_valign(gtk::Align::Center);

docs-site/content/docs/channels.md

@@ -44,9 +44,10 @@ one-line edit of `/etc/apt/sources.list.d/punktfunk.list` (`stable` ↔ `canary`
 
 1. Make sure `main` is green.
 2. (Optional) bump any user-facing version that isn't derived from the tag — the Android
-   `versionName` fallback (`clients/android/app/build.gradle.kts`) and the Decky `plugin.json`
-   `version` are cosmetic self-reported strings; everything else (binaries via
-   `PUNKTFUNK_BUILD_VERSION`, MSIX, apt/rpm, the `.dmg`) derives from the tag automatically.
+   `versionName` fallback (`clients/android/app/build.gradle.kts`) is a cosmetic self-reported
+   string; everything else (binaries via `PUNKTFUNK_BUILD_VERSION`, MSIX, apt/rpm, the `.dmg`, and
+   the **Decky** plugin version — CI stamps it into `package.json`, where it drives the plugin's own
+   [self-update check](/docs/steam-deck#updating)) derives from the tag automatically.
 3. Tag and push — **one** tag releases every platform:
    ```sh
    git tag v0.2.0

docs-site/content/docs/clients.md

@@ -44,7 +44,7 @@ It ships as a real package, not just a source build — full steps in
 
 - **Any Flatpak distro (recommended)** — `flatpak install https://flatpak.unom.io/io.unom.Punktfunk.flatpakref`
   from the hosted [`flatpak.unom.io`](/docs/install-client#linux-desktop-flatpak) repo, then
-  `flatpak update`; this is also what the Decky plugin launches.
+  `flatpak update`; this is also what the [Decky plugin](/docs/steam-deck) launches.
 - **Ubuntu / Debian** — `apt install punktfunk-client` from the punktfunk apt registry.
 - **Fedora / Bazzite** — `rpm-ostree install punktfunk-client` from the Gitea RPM registry.
 - **Arch / SteamOS** — the `punktfunk-client` split package from the `PKGBUILD`.
@@ -108,7 +108,8 @@ punktfunk-probe --connect <host>:9777 --pin <fp>  # connect to one
 | You're streaming to… | Use |
 |---|---|
 | A Mac, iPhone, iPad, or Apple TV | The **Apple app** |
-| A Linux desktop or laptop, or a Steam Deck | **`punktfunk-client`** (GTK4) |
+| A Linux desktop or laptop | **`punktfunk-client`** (GTK4) |
+| A **Steam Deck** | The **[Decky plugin](/docs/steam-deck)** in Gaming Mode, or the GTK4 client in Desktop Mode |
 | An Android phone or TV | The **Android app** |
 | Windows | The native **`punktfunk-client`** (signed MSIX) or **Moonlight** |
 | A browser, a smart TV, or any other device | **Moonlight** |

docs-site/content/docs/install-client.md

@@ -16,7 +16,7 @@ Whichever client you install, the first connection needs a one-time [pairing](/d
 | Device | Install |
 |--------|---------|
 | **Linux** desktop / laptop | [Flatpak](#linux-desktop-flatpak) (any distro) or native apt/rpm/Arch packages |
-| **Steam Deck** | [Flatpak in Desktop Mode](#steam-deck) (or the Decky plugin) |
+| **Steam Deck** | [Decky plugin](/docs/steam-deck) for Gaming Mode, or [Flatpak in Desktop Mode](#steam-deck) |
 | **Windows** | [Signed MSIX](#windows) from the package registry |
 | **macOS** | [Notarized `.dmg`](#macos) from the releases page |
 | **iPhone / iPad / Apple TV** | [TestFlight beta](#ios-ipados-apple-tv) |
@@ -57,16 +57,23 @@ punktfunk-client --connect <host>:9777
 
 ## Steam Deck
 
-In **Desktop Mode**, install the Flatpak exactly as [above](#linux-desktop-flatpak) — it carries
-its own libadwaita + SDL3 and survives SteamOS updates:
+Most Deck users want **Gaming Mode**: install the **[Decky plugin](/docs/steam-deck)** and a
+**punktfunk** panel lands in the Quick Access Menu, so you can discover hosts, pair with a PIN, and
+stream **without dropping to the desktop**. Follow the **[Steam Deck (Decky) guide](/docs/steam-deck)**
+— it walks through Decky Loader, the plugin, and the one-time client install.
+
+> The plugin doesn't decode video itself — it launches the Flatpak client below. The Decky guide
+> covers installing both, so start there: a Flatpak on its own won't add the Gaming Mode panel.
+
+For **Desktop Mode** (or to add the client to Game Mode as a non-Steam app yourself), install the
+Flatpak exactly as [above](#linux-desktop-flatpak) — it carries its own libadwaita + SDL3 and
+survives SteamOS updates:
 
 ```sh
 flatpak install --user https://flatpak.unom.io/io.unom.Punktfunk.flatpakref
 ```
 
-Add it to Game Mode as a non-Steam app, or use the **Decky plugin**, which launches this same
-Flatpak (`flatpak run io.unom.Punktfunk --connect …`). See
-[packaging/flatpak](https://git.unom.io/unom/punktfunk/src/branch/main/packaging/flatpak/README.md).
+See [packaging/flatpak](https://git.unom.io/unom/punktfunk/src/branch/main/packaging/flatpak/README.md).
 
 ## Windows
 

docs-site/content/docs/meta.json

@@ -17,6 +17,7 @@
     "---Connecting---",
     "clients",
     "install-client",
+    "steam-deck",
     "moonlight",
     "pairing",
     "---Configuration---",

docs-site/content/docs/steam-deck.md

@@ -0,0 +1,100 @@
+---
+title: Steam Deck (Decky)
+description: Install the punktfunk Decky plugin to discover, pair, and stream from the Steam Deck's Gaming Mode — no drop to Desktop.
+---
+
+The **Decky plugin** adds a **punktfunk** panel to the Steam Deck's Quick Access Menu (the `…`
+button), so you can find a host, pair, and start streaming **without leaving Gaming Mode**. It's the
+couch-friendly front end for the Steam Deck — built from real Steam UI, gamepad-navigable end to end.
+
+Under the hood the plugin doesn't decode video itself: it discovers hosts, runs the PIN pairing, and
+**launches the regular [Linux client](/docs/clients#linux-desktop-client-gtk4)** (the
+`io.unom.Punktfunk` Flatpak) the way gamescope needs so it fullscreens correctly. So the Deck has two
+ways to stream, and they share one client + one paired identity:
+
+- **Gaming Mode** → the **Decky plugin** (this page).
+- **Desktop Mode** → run the [Flatpak](/docs/install-client#steam-deck) directly, like any Linux app.
+
+## Before you start
+
+You need three things on the Deck:
+
+1. **Decky Loader** — the plugin loader. Install it from [decky.xyz](https://decky.xyz/) if you
+   haven't already.
+2. **The punktfunk client Flatpak** — the plugin launches it, so install it once in **Desktop Mode**:
+
+   ```sh
+   flatpak install --user https://flatpak.unom.io/io.unom.Punktfunk.flatpakref
+   ```
+
+   (Full options: [Install a Client → Steam Deck](/docs/install-client#steam-deck). Without it, the
+   panel's **Stream** button reports `client-not-found`.)
+3. **A punktfunk host** running on your LAN — see [Install the Host](/docs/install). The Deck finds
+   it automatically over mDNS, so nothing to configure here.
+
+## Install the plugin
+
+The plugin is published as a ready-to-install zip on every build. You don't need the Decky CLI or a
+developer toolchain — just paste a URL into Decky:
+
+1. On the Deck, open the **Quick Access Menu** (`…`) → the **plug** icon (Decky) → the **gear**
+   (Settings) → enable **Developer Mode**.
+2. Open the new **Developer** tab and choose **Install Plugin from URL**.
+3. Paste the **stable** link and confirm:
+
+   ```
+   https://git.unom.io/api/packages/unom/generic/punktfunk-decky/latest/punktfunk.zip
+   ```
+
+The **punktfunk** panel appears in the Quick Access Menu right away — no Deck restart needed.
+
+> **Channels.** The link above is the **stable** channel (moves on `vX.Y.Z` releases). For the latest
+> `main` build use the **canary** zip — `…/generic/punktfunk-decky/canary/punktfunk.zip` — or pin an
+> exact version with `…/punktfunk-decky/<version>/punktfunk.zip`. See [Release Channels](/docs/channels).
+
+## Use it
+
+Open the **punktfunk** panel from the Quick Access Menu, or **Open punktfunk** for the full-screen
+page (host list + stream settings).
+
+- **Discover** — hosts on your network appear automatically (mDNS). Tap **Refresh** to rescan. A
+  lock icon means the host requires [pairing](/docs/pairing).
+- **Pair** — for a locked host, [arm pairing on the host](/docs/pairing) (its console or web
+  console shows a 4-digit PIN), then enter that PIN on the Deck's keypad. Pairing persists, so the
+  next connection is silent.
+- **Stream** — pick a host and the stream launches fullscreen in Gaming Mode (as a hidden Steam
+  shortcut, so gamescope focuses it).
+- **Settings** — resolution, refresh, bitrate, gamepad type, and mic, written to the client the
+  plugin launches. Leave **Resolution** / **Refresh** on *Native* to get the Deck's own mode.
+
+To **leave a stream**: the in-client controller chord **L1 + R1 + Start + Select**, or close the
+"game" from the Steam overlay. Exiting the client ends the Steam game and drops you back to Gaming
+Mode.
+
+## Updating
+
+The plugin **checks for updates itself** — no Decky store needed. When a newer build is available it
+shows an **Update to vX** button (in the Quick Access Menu panel and on the full page). Tap it,
+confirm Decky's prompt, and the plugin downloads, verifies, replaces itself, and reloads — without
+leaving Gaming Mode.
+
+The check follows the [channel](/docs/channels) you installed from: a plugin installed from the
+**stable** link tracks stable releases; one installed from the **canary** link tracks `main` builds.
+
+> If the **Update** button never appears (an older Decky Loader, or no network), update manually:
+> Decky → **Developer** → **Install Plugin from URL**, and paste the same channel link again. Decky
+> replaces the installed copy in place.
+
+## Troubleshooting
+
+| Symptom | Fix |
+|---|---|
+| **Stream** shows `client-not-found` | Install the client Flatpak in Desktop Mode (see [Before you start](#before-you-start)). |
+| No hosts listed | Make sure the host is running and on the **same LAN**; the Deck needs `avahi` (shipped on SteamOS). Tap **Refresh**. |
+| Pairing fails / "not armed" | The PIN is shown only after you **arm pairing on the host**. Arm it, then enter the PIN within the window. |
+| Stream launches but doesn't focus | Start it from the panel (not by launching the Flatpak by hand) so Steam/gamescope focuses it. |
+
+The plugin source lives in
+[`clients/decky`](https://git.unom.io/unom/punktfunk/src/branch/main/clients/decky/README.md).
+</content>
+</invoke>