Fix stuck transcriptions and make transcripts stoppable and searchable.

Raise queue retry_after above the job timeout, recover orphaned runs, allow stop/restart with any engine, and keep finished transcripts searchable in the recordings list.

app/Http/Controllers/TranscribeController.php

@@ -11,11 +11,14 @@ class TranscribeController extends Controller
 {
     /**
      * Queue transcription for the recording with the chosen engine.
+     *
+     * Always allowed: stops any current run first, then starts the new engine.
      */
     public function __invoke(TranscribeRecordingRequest $request, Recording $recording): RedirectResponse
     {
-        if ($recording->transcription_status === 'processing') {
-            return back()->with('error', 'Transcription is already in progress.');
+        if ($recording->isTranscribing() || $recording->hasActiveTranscriptionJob()) {
+            $recording->cancelTranscription(silent: true);
+            $recording->refresh();
         }
 
         $driver = $request->validated('driver');
@@ -28,8 +31,8 @@ class TranscribeController extends Controller
             'transcription_percent' => 5,
             'transcription_started_at' => now(),
             'transcription_error' => null,
-            'transcript' => null,
-            'transcribed_at' => null,
+            // Keep the previous transcript until a new run succeeds.
+            'transcribed_at' => $recording->transcribed_at,
         ]);
 
         TranscribeRecording::dispatch($recording->fresh());