feat(client/linux): the app icon reaches About — and the launcher, which never had it either

Adding the icon to the About dialog turned out to be one line and a missing install: the
icon existed, but only the flatpak ever shipped it. The deb, rpm, arch and nix entries all
carried `Icon=video-display` — a stock monitor glyph — so on every non-flatpak install the
launcher, the taskbar and the window switcher have been showing a generic icon this whole
time. About would have shown the same nothing.

So the icon moves out of `packaging/flatpak/` into `packaging/linux/icons/hicolor/` beside
the tray icons, which is where a shared asset belongs, and all five packagings install it
to the same hicolor path. The desktop entry names the app's own icon, and `AboutDialog`
names the app id — one identity resolved through the icon theme rather than a path anyone
has to keep in step.

A `PUNKTFUNK_SHOT_SCENE=about` scene comes along so the dialog is capturable like every
other surface; that is how the icon above was verified to actually resolve rather than
silently falling back.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

clients/linux/src/cli.rs

@@ -531,6 +531,9 @@ pub fn run_shot(ctx: &ShotCtx, scene: &str) {
                 "00aabbccddeeff112233445566778899a0b1c2d3e4f5061728394a5b6c7d8e9f",
             )));
         }
+        "about" | "08-about" => {
+            crate::ui_settings::show_about(&ctx.window);
+        }
         "settings" | "03-settings" => {
             // Mock devices so the shot shows the probe-dependent pickers populated.
             let dev = |name: &str, description: &str| pf_client_core::audio::AudioDevice {

clients/linux/src/ui_settings.rs

@@ -707,6 +707,10 @@ const THIRD_PARTY_NOTICES: &str = include_str!("../../../THIRD-PARTY-NOTICES.txt
 pub fn show_about(parent: &impl IsA<gtk::Widget>) {
     let about = adw::AboutDialog::builder()
         .application_name("Punktfunk")
+        // The app's own icon, by the id the desktop entry and the icon theme both use. It
+        // resolves from the installed hicolor icon; an uninstalled dev run simply shows the
+        // generic fallback rather than nothing.
+        .application_icon(crate::app::APP_ID)
         .developer_name("unom")
         .version(env!("CARGO_PKG_VERSION"))
         .website("https://git.unom.io/unom/punktfunk")

packaging/arch/PKGBUILD

@@ -253,6 +253,9 @@ package_punktfunk-client() {
   install -Dm0755 "$T/punktfunk-session" "$pkgdir/usr/bin/punktfunk-session"
   # The headless CLI (design/client-architecture-split.md §4).
   install -Dm0755 "$T/punktfunk" "$pkgdir/usr/bin/punktfunk"
+  # The app icon the desktop entry (and the About dialog) name.
+  install -Dm0644 "$R/packaging/linux/icons/hicolor/scalable/apps/io.unom.Punktfunk.svg" \
+    "$pkgdir/usr/share/icons/hicolor/scalable/apps/io.unom.Punktfunk.svg"
   install -Dm0644 "$R/packaging/linux/io.unom.Punktfunk.desktop" \
     "$pkgdir/usr/share/applications/io.unom.Punktfunk.desktop"
   # DualSense hidraw access (full pad fidelity through SDL's HIDAPI driver).

packaging/debian/build-client-deb.sh

@@ -55,6 +55,10 @@ install -Dm0755 "$SESSION_BIN"                           "$STAGE/usr/bin/punktfu
 install -Dm0755 "$CLI_BIN"                               "$STAGE/usr/bin/punktfunk"
 install -Dm0644 packaging/linux/io.unom.Punktfunk.desktop \
                 "$STAGE/usr/share/applications/io.unom.Punktfunk.desktop"
+# The app icon the desktop entry (and the About dialog) name. Without it the launcher falls
+# back to a generic monitor glyph, which is what shipped until now.
+install -Dm0644 packaging/linux/icons/hicolor/scalable/apps/io.unom.Punktfunk.svg \
+                "$STAGE/usr/share/icons/hicolor/scalable/apps/io.unom.Punktfunk.svg"
 # DualSense hidraw access (full pad fidelity through SDL's HIDAPI driver).
 install -Dm0644 scripts/70-punktfunk-client.rules \
                 "$STAGE/usr/lib/udev/rules.d/70-punktfunk-client.rules"

packaging/flatpak/io.unom.Punktfunk.yml

@@ -235,7 +235,9 @@ modules:
       - install -Dm0644 packaging/flatpak/io.unom.Punktfunk.metainfo.xml
           ${FLATPAK_DEST}/share/metainfo/io.unom.Punktfunk.metainfo.xml
       # Scalable icon named for the app id (GNOME runtime renders SVG via librsvg).
-      - install -Dm0644 packaging/flatpak/io.unom.Punktfunk.svg
+      # One icon source for every Linux packaging (it used to live under packaging/flatpak,
+      # which is why the deb/rpm/arch entries shipped a stock `video-display` instead).
+      - install -Dm0644 packaging/linux/icons/hicolor/scalable/apps/io.unom.Punktfunk.svg
           ${FLATPAK_DEST}/share/icons/hicolor/scalable/apps/io.unom.Punktfunk.svg
     sources:
       # The repo checkout. For a Flathub/published build, replace with a pinned git source:

packaging/linux/io.unom.Punktfunk.desktop

@@ -3,7 +3,7 @@ Type=Application
 Name=Punktfunk
 Comment=Stream a remote punktfunk host
 Exec=punktfunk-client %u
-Icon=video-display
+Icon=io.unom.Punktfunk
 Terminal=false
 Categories=Network;Game;
 Keywords=streaming;remote;game;moonlight;

packaging/nix/packages.nix

@@ -258,6 +258,10 @@ in
         # hidraw access for the seated user's DualSense (SDL HIDAPI full-fidelity path).
         install -Dm0644 scripts/70-punktfunk-client.rules "$out/lib/udev/rules.d/70-punktfunk-client.rules"
 
+        # The app icon the desktop entry (and the About dialog) name.
+        install -Dm0644 packaging/linux/icons/hicolor/scalable/apps/io.unom.Punktfunk.svg \
+          "$out/share/icons/hicolor/scalable/apps/io.unom.Punktfunk.svg"
+
         # Desktop launcher — point Exec at the store binary (wrapped below).
         install -Dm0644 packaging/linux/io.unom.Punktfunk.desktop \
           "$out/share/applications/io.unom.Punktfunk.desktop"

packaging/rpm/punktfunk.spec

@@ -331,6 +331,10 @@ install -Dm0755 target/release/punktfunk-session %{buildroot}%{_bindir}/punktfun
 install -Dm0755 target/release/punktfunk %{buildroot}%{_bindir}/punktfunk
 install -Dm0644 packaging/linux/io.unom.Punktfunk.desktop \
                 %{buildroot}%{_datadir}/applications/io.unom.Punktfunk.desktop
+# The app icon the desktop entry (and the About dialog) name. Without it the launcher falls
+# back to a generic monitor glyph, which is what shipped until now.
+install -Dm0644 packaging/linux/icons/hicolor/scalable/apps/io.unom.Punktfunk.svg \
+                %{buildroot}%{_datadir}/icons/hicolor/scalable/apps/io.unom.Punktfunk.svg
 # DualSense hidraw access (full pad fidelity through SDL's HIDAPI driver).
 install -Dm0644 scripts/70-punktfunk-client.rules \
                 %{buildroot}%{_udevrulesdir}/70-punktfunk-client.rules
@@ -447,6 +451,7 @@ install -Dm0644 scripts/punktfunk-scripting.service %{buildroot}%{_userunitdir}/
 %{_bindir}/punktfunk-client
 %{_bindir}/punktfunk-session
 %{_datadir}/applications/io.unom.Punktfunk.desktop
+%{_datadir}/icons/hicolor/scalable/apps/io.unom.Punktfunk.svg
 %{_udevrulesdir}/70-punktfunk-client.rules
 %{_prefix}/lib/sysctl.d/99-punktfunk-client-net.conf