Add selectable Voxtype and Superwhisper dictation (#14552)

* 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

install/user/first-run/install-voxtype.hook

@@ -3,7 +3,7 @@
 set -e
 
 if omarchy-done ensure voxtype-install-invitation; then
-  omarchy-notification-send -u critical -g  "Install Dictation with Voxtype" \
+  omarchy-notification-send -u critical -g  "Install Dictation" \
     "Click to install voice dictation for Omarchy." \
-    --exec omarchy-launch-floating-terminal-with-presentation omarchy-voxtype-install
+    --exec omarchy-menu summon setup.default.dictation
 fi