* feat(settings): replace tab navigation with searchable sidebar and topic pages
- Sidebar (icon + label) with Gtk.Stack replaces the 7-tab notebook
- Live settings search (Ctrl+F): filters rows in place, per-page match
counts, dims pages without hits, empty-results state
- Topic-based pages per GNOME HIG: Dictation, Speech Model, Audio,
Performance, Application, Advanced
- Persistent bottom status strip: recognition state, shared mic level
bar, and Test Dictation with inline transcription output
- GPU device selection moves out of the power-user gate onto the
Performance page; Reset to Defaults moves into the Advanced page
- Consolidated model info card (info + warning + legend in one surface)
- Contextual custom-shortcut row, in-list auto-pause empty state,
uniform control widths, aligned group descriptions
- Esc clears search, Ctrl+W closes
* test(settings): update source-inspection tests for sidebar redesign, add search coverage
* fix(settings): index unlocked advanced controls in search
Co-authored-by: Jatin K Malik <jatinkrmalik@users.noreply.github.com>
* fix(settings): restore selected page after clearing search
Co-authored-by: Jatin K Malik <jatinkrmalik@users.noreply.github.com>
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Co-authored-by: Jatin K Malik <jatinkrmalik@users.noreply.github.com>
