Qt 6.12 shadows the bare Color singleton, so the bar and every Color
role read undefined on fresh installs. Keep our I18n text in the four
conflicting files, qualify #14433's notification button color, give the
new dictation menu rows and notifications Chinese, and drop table
entries for the removed Voxtype and FIDO2 texts.
* Add selectable dictation backends
* Move dictation migration after repository priority update
* Extract backend-specific dictation installers
* Keep dictation installer dispatcher executable
* Call dictation backend installers directly
* Drop legacy Superwhisper migration and runtime cleanup
* Separate dictation defaults from generic recording protocol
* Add backend-specific dictation removers
* Preserve existing Voxtype selection during upgrade
* Make dictation backend selection safe and retryable
* Show the dictation indicator only for selected Voxtype
* Allow switching away from stopped Superwhisper
* Remove the built-in bar dictation indicator
* Store default dictation selection under defaults
* Rename dictation backend selector to use
* Move dictation removers into their own menu category