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/img/op-labs-square.svg

@@ -0,0 +1,6 @@
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