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/CancelTranscriptionController.php

@@ -0,0 +1,23 @@
+<?php
+
+namespace App\Http\Controllers;
+
+use App\Models\Recording;
+use Illuminate\Http\RedirectResponse;
+
+class CancelTranscriptionController extends Controller
+{
+    /**
+     * Stop an in-progress or queued transcription.
+     */
+    public function __invoke(Recording $recording): RedirectResponse
+    {
+        if (! $recording->isTranscribing()) {
+            return back()->with('error', 'No transcription is currently running.');
+        }
+
+        $recording->cancelTranscription();
+
+        return back()->with('success', 'Transcription stopped.');
+    }
+}