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>

src/app.css

@@ -0,0 +1,75 @@
+@import 'tailwindcss';
+
+/* ── Tonemark design tokens ─────────────────────────────────── */
+:root {
+  --accent: #cdf24e;
+  --accent-rgb: 205,242,78;
+  --accent-glow: rgba(205,242,78,0.06);
+  --accent-dim: rgba(205, 242, 78, 0.12);
+  --accent-border: rgba(205, 242, 78, 0.3);
+  --bg: #0c0d10;
+  --surface: rgba(255, 255, 255, 0.025);
+  --surface-hover: rgba(255, 255, 255, 0.04);
+  --border: rgba(255, 255, 255, 0.06);
+  --text: #e8e9ec;
+  --text-muted: rgba(232, 233, 236, 0.5);
+  --text-dim: rgba(232, 233, 236, 0.4);
+  --font-ui: 'Inter', system-ui, -apple-system, sans-serif;
+  --font-mono: 'JetBrains Mono', 'SF Mono', ui-monospace, monospace;
+  --radius-sm: 8px;
+  --radius-md: 12px;
+  --radius-lg: 16px;
+  --rail-width: 200px;
+}
+
+/* ── Base ───────────────────────────────────────────────────── */
+*, *::before, *::after { box-sizing: border-box; }
+
+html, body {
+  margin: 0;
+  padding: 0;
+  background: var(--bg);
+  color: var(--text);
+  font-family: var(--font-ui);
+  letter-spacing: -0.01em;
+  min-height: 100vh;
+}
+
+body {
+  background:
+    radial-gradient(120% 80% at 90% -10%, var(--accent-glow), transparent 60%),
+    var(--bg);
+}
+
+/* ── Glass surface ──────────────────────────────────────────── */
+.glass {
+  background: linear-gradient(180deg, rgba(255,255,255,0.04), rgba(255,255,255,0.015));
+  border: 1px solid var(--border);
+  border-radius: var(--radius-lg);
+  backdrop-filter: blur(20px);
+  box-shadow: 0 1px 0 rgba(255,255,255,0.04) inset, 0 24px 48px -24px rgba(0,0,0,0.5);
+}
+
+/* ── Mono label ─────────────────────────────────────────────── */
+.mono { font-family: var(--font-mono); }
+.label {
+  font-family: var(--font-mono);
+  font-size: 11px;
+  text-transform: uppercase;
+  letter-spacing: 0.08em;
+  color: var(--text-muted);
+}
+
+/* ── Scrollbar ──────────────────────────────────────────────── */
+::-webkit-scrollbar { width: 4px; }
+::-webkit-scrollbar-track { background: transparent; }
+::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.1); border-radius: 2px; }
+
+/* ── Focus ring ─────────────────────────────────────────────── */
+:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
+
+/* ── Animations ─────────────────────────────────────────────── */
+@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.3; } }
+@keyframes blink { 0%, 50% { opacity: 1; } 51%, 100% { opacity: 0; } }
+@keyframes spin { to { transform: rotate(360deg); } }
+