Add ttl.sh favicon - timer/clock design

- Green gradient background (matches accent color)
- Clock face with timer knob on top
- Clean, recognizable at small sizes

Signed-off-by: Marc Campbell <marc.e.campbell@gmail.com>

web/src/app/layout.tsx

@@ -20,19 +20,11 @@ export const metadata: Metadata = {
   icons: {
     icon: [
       {
-        url: '/icon-light-32x32.png',
-        media: '(prefers-color-scheme: light)',
-      },
-      {
-        url: '/icon-dark-32x32.png',
-        media: '(prefers-color-scheme: dark)',
-      },
-      {
-        url: '/icon.svg',
+        url: '/favicon.svg',
         type: 'image/svg+xml',
       },
     ],
-    apple: '/apple-icon.png',
+    apple: '/icon.svg',
   },
 }