android: rich GPS notification with pace, request POST_NOTIFICATIONS

- Notification title: "Bocken — Tracking GPS for active Workout"
- Live updates with elapsed time, distance, and pace (min/km)
- Request POST_NOTIFICATIONS permission at runtime (Android 13+)
- Page titles: "- Fitness" → "- Bocken" (missed in prior commit)

src/routes/fitness/[workout=fitnessWorkout]/[active=fitnessActive]/+page.svelte

@@ -519,7 +519,7 @@
 </script>
 
 <svelte:head>
-	<title>{workout.name || (lang === 'en' ? 'Workout' : 'Training')} - Fitness</title>
+	<title>{workout.name || (lang === 'en' ? 'Workout' : 'Training')} - Bocken</title>
 	<link rel="stylesheet" href="https://unpkg.com/leaflet@1.9.4/dist/leaflet.css" />
 </svelte:head>