feat: Add OP Labs branding — favicon, PWA icons, manifest, UI logo

- OP Labs icon SVG as default app icon + favicon (SVG + ICO fallback)
- 192x192 and 512x512 PWA icons generated from OP Labs logo
- Updated manifest.json with SVG favicon + maskable icon support
- Updated index.html with SVG favicon link
- Replaced old ic_logo.svg with OP Labs icon mark
- Stored OP Labs logo assets (icon, horizontal, square) in artifacts/
- Removed old PiPedal20Thumb.jpg

vite/public/manifest.json

@@ -11,9 +11,10 @@
     "homepage_url": "https://ourpad.casa/op-pedal",
     "icons": [
         {
-            "src": "favicon.ico",
-            "sizes": "64x64 32x32 24x24 16x16",
-            "type": "image/x-icon"
+            "src": "favicon.svg",
+            "sizes": "any",
+            "type": "image/svg+xml",
+            "purpose": "any"
         },
         {
             "src": "logo192.png",
@@ -24,6 +25,18 @@
             "src": "logo512.png",
             "type": "image/png",
             "sizes": "512x512"
+        },
+        {
+            "src": "logo192.png",
+            "type": "image/png",
+            "sizes": "192x192",
+            "purpose": "maskable"
+        },
+        {
+            "src": "logo512.png",
+            "type": "image/png",
+            "sizes": "512x512",
+            "purpose": "maskable"
         }
     ],
     "start_url": ".",