refactor: update branding assets and convert settings to accordion UI

- Replace SVG favicons with PNG icons from new smeshicon assets
- Add theme-aware Icon component using smeshiconlight/dark PNGs
- Refactor Settings page to use collapsible accordion sections
- Add Radix UI accordion component with animations
- Update QrCode component to use new PNG icon
- Remove old favicon.svg and nostr.json files
- Add new logo assets in resources/ and src/assets/

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

public/.well-known/nostr.json

@@ -1,7 +0,0 @@
-{
-  "names": {
-    "_": "f4eb8e62add1340b9cadcd9861e669b2e907cea534e0f7f3ac974c11c758a51a",
-    "cody": "8125b911ed0e94dbe3008a0be48cfe5cd0c0b05923cfff917ae7e87da8400883",
-    "cody2": "24462930821b45f530ec0063eca0a6522e5a577856f982fa944df0ef3caf03ab"
-  }
-}