fix(appimage): smoke-test fixes for tray, labels, and packaging (#602)

* fix(ui): AppImage smoke fixes for tray icons, labels, and identity

Replace placeholder mic tray SVGs with opaque branded icons, show
whisper.cpp instead of Whisper_cpp, set GLib/AppIndicator identity to
Vocalinux (not main.py), and give About dialog buttons enough padding
so labels are not clipped under Adwaita.

* fix(packaging): harden AppImage build for Wayland and tray deps

Pin the build interpreter, install onnxruntime into the bundle, set
desktop Exec=AppRun + StartupWMClass, prune typelibs to an allowlist
after linuxdeploy, and stop forcing GDK_BACKEND=x11 on Wayland
(VOCALINUX_FORCE_X11=1 remains as an escape hatch). CI AppImage jobs
also pull Ayatana AppIndicator and librsvg SVG loader packages.

* fix(packaging): bundle full stdlib from base_prefix in AppImage

When build.sh runs under a venv, sys.prefix only has site-packages, so
the AppImage was missing encodings and crashed on start. Copy the
interpreter and stdlib from sys.base_prefix, force pip
--ignore-installed into AppDir, set Gdk program class to Vocalinux, and
tone down the muted tray slash so small StatusNotifier icons stay slate.

* fix(tray): use absolute icon paths so stale hicolor icons lose

XFCE StatusNotifier resolves IconName through the system theme and can
ignore IconThemePath. A leftover ~/.local/share/icons placeholder
(vocalinux-microphone-off.svg filled #e74c3c) was winning over the
AppImage's bundled icons. Outside Flatpak, pass absolute SVG paths to
set_icon_full / new_with_path instead of bare theme names.

.github/workflows/release.yml

@@ -42,7 +42,10 @@ jobs:
             gobject-introspection \
             gir1.2-gtk-3.0 \
             gir1.2-appindicator3-0.1 \
-            gir1.2-ibus-1.0
+            gir1.2-ayatanaappindicator3-0.1 \
+            gir1.2-ibus-1.0 \
+            gir1.2-rsvg-2.0 \
+            librsvg2-common
 
       - name: Install build dependencies
         run: |
@@ -163,7 +166,10 @@ jobs:
             gobject-introspection \
             gir1.2-gtk-3.0 \
             gir1.2-appindicator3-0.1 \
-            gir1.2-ibus-1.0
+            gir1.2-ayatanaappindicator3-0.1 \
+            gir1.2-ibus-1.0 \
+            gir1.2-rsvg-2.0 \
+            librsvg2-common
 
       - name: Install build dependencies
         run: |