feat: extend quota providers and add usage dropdown (#254) (#284)

* feat: extend quota providers and add usage dropdown

Add new quota providers:
- Claude (Anthropic API)
- Codex (OpenAI/ChatGPT)
- GitHub Copilot (base + add-on)
- Kimi for Coding
- OpenRouter

UI enhancements:
- Add rate limits dropdown in header with timer icon
- Desktop: sticky header with Used/Remaining toggle, refresh button
- Mobile: full-screen dropdown with same controls
- Per-provider sticky headers with provider logos
- Auto-refresh on open if no data exists

Usage settings page:
- Provider icon next to header
- Show in dropdown toggle per provider
- Global display selector (Usage vs Quota remaining)
- Auto-refresh controls in sidebar

Settings persistence:
- Add usageDisplayMode and usageDropdownProviders settings
- Server-side sanitization for new settings

Provider logo aliases:
- codex -> openai, claude -> anthropic

Bug fixes:
- Fix React error #310 by calling hooks before early returns
- Add aria-describedby to SettingsWindow dialog
- Remove horizontal scroll from dropdown

* fix: Remove duplicate github copilot declarations

packages/web/server/index.js

@@ -984,6 +984,9 @@ const sanitizeSettingsUpdate = (payload) => {
   if (typeof candidate.usageRefreshIntervalMs === 'number' && Number.isFinite(candidate.usageRefreshIntervalMs)) {
     result.usageRefreshIntervalMs = Math.max(30000, Math.min(300000, Math.round(candidate.usageRefreshIntervalMs)));
   }
+  if (Array.isArray(candidate.usageDropdownProviders)) {
+    result.usageDropdownProviders = normalizeStringArray(candidate.usageDropdownProviders);
+  }
   if (typeof candidate.autoDeleteEnabled === 'boolean') {
     result.autoDeleteEnabled = candidate.autoDeleteEnabled;
   }