* feat(ui): add floating glowing dictation overlay
Show a bottom-center non-focus overlay while recognition is LISTENING
or PROCESSING so users get a clear visual cue beyond the tray icon.
Optional GtkLayerShell on Wayland; plain always-on-top GTK fallback
elsewhere. Configurable via ui.show_overlay (default on) and Settings.
* fix(test): isolate dictation overlay tests from GTK pollution
Overlay unit tests no longer construct real GTK windows or import
tray_indicator, which was loading gi.repository early and breaking
later tests that mock GI (single-instance and suspend GLib checks).
* docs: add dictation overlay screenshots
Capture the floating glowing orb in listening (green) and processing
(amber) states for the PR and README screenshots section.
* test(ui): raise dictation overlay coverage for Codecov patch gate
Exercise GTK init, draw/animation, positioning, layer-shell fallbacks,
tray overlay wiring, settings toggle, and config edge cases so patch
coverage on the floating overlay clears the 80% Codecov target.
* test(tray): call overlay helpers via unbound methods
Avoid instance-level MagicMock shadowing of set_overlay_enabled under
some import/mock orderings (seen on CI Python 3.10).
* test(tray): inject explicit config mock for overlay helpers
Assign a MagicMock config_manager on the instance so assertions do not
depend on the constructor patch (which can leave a real ConfigManager
under some Python versions / import orders).
* refactor(ui): ponytail pass on dictation overlay
Drop the hand-drawn mic glyph, simplify the Cairo clear/pulse path,
reuse ConfigManager get_bool/set, tighten tray overlay helpers, and
delete string-grep structural tests that proved nothing.
* fix(ui): pin overlay to bottom strip and stop stealing focus
Use a full-width bottom strip (layer-shell left/right/bottom anchors, or
resize+move fallback) so the orb is bottom-center on Wayland. Map the
window once and toggle opacity instead of hide/show so compositors do not
re-activate it and yank focus out of the editor (which broke IBus inject).
* fix(appimage): seed GtkLayerShell typelib for dictation overlay
* fix(ui): address greptile findings on dictation overlay
* fix(appimage): keep layer-shell typelib optional for direct builds
