docs: update the memory bank

memory-bank/activeContext.md

@@ -30,12 +30,13 @@
 - **Message Switching Animation**: Added smooth fade-out/fade-in transitions when switching between selected messages in overlay (300ms duration).
 - **Smart Message Preservation**: Implemented intelligent message trimming - regular chat messages limited to 200, but superchats and memberships preserved for entire session. Trimming happens on every message to prevent loss of special messages.
 - **Super Sticker Support**: Added full support for super sticker image display. Backend parser extracts sticker URL and accessibility label from `item.sticker` array in YouTube data. Added `stickerUrl` and `stickerAlt` fields to `SuperChatInfo` type. Image proxy whitelist updated to include `lh3.googleusercontent.com` domain. Dashboard and overlay both render super stickers with 144x144px max dimensions, centered layout, and graceful error handling that hides broken images. Protocol-relative URLs (`//domain.com`) are automatically converted to HTTPS.
-- **Task Master AI Integration**: Initialized Task Master AI with OpenRouter's x-ai/grok-code-fast-1 model for task management. Successfully completed Task 2 (Super Sticker Display) with 5 subtasks.
+- **Leaderboard Badge Support**: Implemented YouTube leaderboard rank display (Top Chatter feature). Backend parser extracts rank from `before_content_buttons` array with CROWN icon, parsing rank number from title field (e.g., "#3"). Added `leaderboardRank` field to `ChatMessage` type. Dashboard and overlay render leaderboard badge with crown emoji (👑) and rank number, styled with golden background (rgba(251, 191, 36, 0.2)) and yellow text (#fcd34d) for prominence.
+- **Task Master AI Integration**: Initialized Task Master AI with OpenRouter's x-ai/grok-code-fast-1 (main), google/gemini-2.5-pro (research), and google/gemini-2.5-flash (fallback) models. Successfully completed Task 2 (Super Sticker Display) and Task 3 (Leaderboard Badge) with all subtasks.
 
 ## Immediate Next Steps
-1. Implement chat leaderboard badge support (Task 3)
-2. Add live poll display functionality (Task 4)
-3. Implement user authentication via YouTube OAuth 2.0 (Task 5)
+1. Add live poll display functionality (Task 4)
+2. Implement user authentication via YouTube OAuth 2.0 (Task 5)
+3. Add persistent image cache with SQLite (Task 6)
 4. Consider persistent cache for images (SQLite or file-based) for better reliability
 5. Add error recovery and reconnection logic for stream interruptions
 

memory-bank/progress.md

@@ -22,7 +22,7 @@
 - [x] Timezone-aware timestamp formatting for all messages.
 - [x] Visual selection state management (active, normal, previously-selected).
 - [x] Fix super sticker image not showing.
-- [ ] Add chat leaderboard badge.
+- [x] Add chat leaderboard badge.
 - [ ] Show open polls.
 - [ ] Handle error states (rate limits, disconnects) gracefully in UI.
 
@@ -59,4 +59,5 @@
 - **✅ Overlay Animations**: Smooth fade-out/in transitions when switching between messages
 - **✅ Smart Storage**: Regular messages limited to 200, superchats and memberships preserved for entire session
 - **✅ Super Sticker Support**: Super sticker images now display correctly in both dashboard and overlay with proper error handling and accessibility labels
-- **Next**: Add chat leaderboard badge, show open polls, implement error recovery
+- **✅ Leaderboard Badge Support**: YouTube leaderboard ranks (Top Chatter) now display with crown emoji and rank number next to usernames in both dashboard and overlay with golden styling
+- **Next**: Show open polls, implement error recovery, add user authentication

memory-bank/systemPatterns.md

@@ -22,3 +22,4 @@
 - **Smart Message Storage**: Intelligent trimming system preserves all superchats and memberships for entire session while limiting regular messages to 200 most recent. Trimming occurs on every message addition to prevent special message loss. Uses order-preserving algorithm that identifies special messages by index and removes only oldest regular messages.
 - **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.