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feat: add YouTube live poll support

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Add backend support for YouTube live polls including:
- Poll event handling and state tracking
- New `/poll/current` endpoint for current poll data
- Server-sent events stream at `/poll/stream` for real-time updates
- Poll emitter for broadcasting poll changes to clients
This commit is contained in:
Yusuf İpek
2025-10-12 23:04:57 +03:00
parent 81d4df5ff7
commit 4a4b2407b6
8 changed files with 165 additions and 22 deletions
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memory-bank/systemPatterns.md
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- **Overlay Animation System**: Two-state approach with `message` (backend data) and `displayMessage` (UI state) enables smooth fade transitions when switching messages. 300ms fade-out followed by content swap and automatic fade-in.
- **Super Sticker Parsing**: Backend `extractSuperChatInfo()` function detects super stickers via `item.sticker` array. Extracts largest image (144x144px) from sticker thumbnails array, handles protocol-relative URLs by converting to HTTPS, and captures accessibility labels for screen readers. Frontend conditionally renders stickers with error handling that hides broken images via `onError` handler.
- **Leaderboard Badge Parsing**: Backend `extractLeaderboardRank()` function scans `before_content_buttons` array for CROWN icon entries. Extracts rank number from title field using regex pattern `/#(\d+)/`. Returns numeric rank or undefined if not present. Frontend displays badge with crown emoji and rank using golden color scheme for visual prominence.
- **Poll Detection System**: Backend listens for `UpdateLiveChatPollAction` events to detect active polls and emits simple poll state (id + active flag) via SSE. Frontend displays pulsing purple poll indicator in dashboard header when poll is active. Poll closes automatically when backend receives `CloseLiveChatActionPanelAction` or `RemoveBannerForLiveChatCommand` events. Note: YouTube's live chat API does not provide vote percentages even with authentication, so only poll presence is indicated.