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

test/shell.d/hyprland-binding-conflicts-test.sh

@@ -147,8 +147,11 @@ trap 'rm -rf "$tmpdir"' EXIT
 home="$tmpdir/home"
 stub_bin="$tmpdir/bin"
 mkdir -p "$home" "$stub_bin"
-touch "$stub_bin/voxtype"
-chmod +x "$stub_bin/voxtype"
+cat > "$stub_bin/omarchy-default-dictation" <<'SH'
+#!/bin/bash
+echo voxtype
+SH
+chmod +x "$stub_bin/omarchy-default-dictation"
 
 bindings=$(PATH="$stub_bin:$PATH" list_bindings "$home")
 [[ -n $bindings ]] || fail "default bindings load for the conflict check"