Initial commit: Tonemark PWA

Tonemark is a SvelteKit PWA for transcribing YouTube videos, audio
and video files, and microphone recordings using a local Whisper backend.

Features:
- Dark glassmorphic UI with electric-lime accent (5 switchable themes)
- Rail nav (desktop) / tab bar (mobile) layout
- Drop zone, YouTube URL input, and live audio recording inputs
- Audio mode waveform cards (none / standard / aggressive / auto)
- Real-time transcription progress with animated waveform
- Job queue with SSE streaming updates
- Push notifications on job completion
- PWA with native SvelteKit service worker
- SRT / TXT / MD / JSON transcript downloads

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

static/manifest.json

@@ -0,0 +1,44 @@
+{
+  "name": "Tonemark",
+  "short_name": "Tonemark",
+  "description": "Fast audio and video transcription powered by Whisper",
+  "start_url": "/",
+  "display": "standalone",
+  "background_color": "#0c0d10",
+  "theme_color": "#0c0d10",
+  "orientation": "any",
+  "share_target": {
+    "action": "/share",
+    "method": "POST",
+    "enctype": "multipart/form-data",
+    "params": {
+      "title": "title",
+      "text": "text",
+      "url": "url",
+      "files": [
+        {
+          "name": "file",
+          "accept": ["audio/*", "video/*"]
+        }
+      ]
+    }
+  },
+  "icons": [
+    {
+      "src": "/icons/android-icon-192.png",
+      "sizes": "192x192",
+      "type": "image/png"
+    },
+    {
+      "src": "/icons/android-icon-512.png",
+      "sizes": "512x512",
+      "type": "image/png"
+    },
+    {
+      "src": "/icons/tonemark-icon-android-fg.svg",
+      "sizes": "any",
+      "type": "image/svg+xml",
+      "purpose": "maskable"
+    }
+  ]
+}