feat(decky): native-touch controller layout + restructured shortcuts + artwork

Ship a Steam Input controller layout (controller_config/punktfunk.vdf) whose
always-on `ts_n` command enables native touchscreen delivery on the Deck, and
have the backend auto-install it (apply_controller_config: copy to
controller_base/templates + upsert the per-account configset entry, chown to the
user, back up first). This is what makes the Deck touchscreen reach the client
as native touch under gamescope without disabling Steam Input (impossible on the
Deck) — no manual controller setup.

Two shortcuts sharing the "Punktfunk" name (so one config key covers both): a
hidden stateful stream entry and a visible stateless entry that launches straight
into the gamepad UI. Both get full artwork (grid/gridwide/hero/logo/icon,
replaced with exported PNGs). Drop the art-generation script.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

clients/decky/bin/punktfunkrun.sh

@@ -12,7 +12,7 @@
 # Per-session parameters arrive as environment variables, set as the shortcut's Steam launch
 # options by the plugin (SteamClient.Apps.SetAppLaunchOptions), so ONE generic shortcut serves
 # every host (and every pinned game):
-#   PF_HOST   host[:port] to connect to            (required)
+#   PF_HOST   host[:port] to connect to            (required for streaming; optional for browse)
 #   PF_LAUNCH library id to launch on connect       (optional, e.g. steam:570 — pinned games)
 #   PF_BROWSE non-empty = open the gamepad library  (optional; --browse instead of --connect)
 #   PF_MGMT   management-API port for --browse       (optional; client defaults to 47990)
@@ -36,24 +36,31 @@ set -u
 APPID="${PF_APPID:-io.unom.Punktfunk}"
 FLATPAK="${PF_FLATPAK:-flatpak}"
 
-if [ -z "${PF_HOST:-}" ]; then
-    echo "punktfunkrun: PF_HOST is not set (the plugin sets it as a launch option)" >&2
-    exit 2
-fi
-
 # exec so the flatpak client IS the game process — when it exits, Steam ends the "game" and
 # Gaming Mode reclaims focus automatically (no manual refocus needed).
 # --fullscreen: present the stream chrome-less and fullscreen (the client also auto-detects the
 # Deck/gamescope env, and ignores the flag harmlessly on older builds that predate it).
 if [ -n "${PF_BROWSE:-}" ]; then
-    # The gamepad library launcher: browse the host's games on-screen, A streams one,
-    # session end returns to the launcher, B quits back to Gaming Mode.
+    # The gamepad UI. BARE `--browse` (no PF_HOST) opens the console home — the self-contained
+    # host picker + pairing + settings, gamepad-navigable — which is what the stateless, visible
+    # library shortcut launches. `--browse <host>` opens straight into that host's library (the
+    # per-host "open on screen" action). A streams a game, session end returns here, B quits.
+    if [ -z "${PF_HOST:-}" ]; then
+        echo "punktfunkrun: gamepad UI $APPID --browse (console home)" >&2
+        exec "$FLATPAK" run --arch=x86_64 "$APPID" --browse --fullscreen
+    fi
     echo "punktfunkrun: library $APPID --browse $PF_HOST" >&2
     if [ -n "${PF_MGMT:-}" ]; then
         exec "$FLATPAK" run --arch=x86_64 "$APPID" --browse "$PF_HOST" --mgmt "$PF_MGMT" --fullscreen
     fi
     exec "$FLATPAK" run --arch=x86_64 "$APPID" --browse "$PF_HOST" --fullscreen
 fi
+
+# Streaming modes need a host (browse above is the only host-less path).
+if [ -z "${PF_HOST:-}" ]; then
+    echo "punktfunkrun: PF_HOST is not set (the plugin sets it as a launch option)" >&2
+    exit 2
+fi
 if [ -n "${PF_LAUNCH:-}" ]; then
     # A pinned game: the id rides the session Hello and the host launches that title.
     echo "punktfunkrun: streaming $APPID --connect $PF_HOST --launch $PF_LAUNCH" >&2