Move the voice reminder (domina mode) feature from a built-in Angular
feature into a self-contained plugin with its own manifest, i18n, and
config dialog. Add registerConfigHandler plugin API for settings button
on plugin cards. Include migration logic to auto-enable the plugin and
transfer config for users who had domina mode enabled.
- Fix currentTaskChange hook to dispatch full Task object instead of ID
- Extract shared BUNDLED_PLUGIN_PATHS constant to eliminate duplication
- Use firstValueFrom instead of deprecated .toPromise()
- Add voice name fallback matching for migrated configs
- Mark DominaModeConfig and selector as @deprecated
- Add unit tests for onCurrentTaskChange and config handler
