* feat: UI improvements for OAuth dialog, provider badges, and events docs
- Replace OAuth device code toast with a proper Dialog showing the code
prominently with a copy button (GitHub Copilot, Qwen Code, ChatGPT Pro)
- Add "New" badge on provider template cards for ChatGPT Plus/Pro,
GitHub Copilot, and Qwen Code with orange border highlight
- Add events.md documenting all analytics events across the platform
* fix: add verificationUri to DeviceCodeDialog for popup-blocked fallback
Add verificationUri to PendingDeviceCode interface and pass it from
both handleClientAuth and handleServerAuth. Render a fallback "Open
verification page" link in DeviceCodeDialog so users can navigate
to the auth page if the popup was blocked.
