TASK-31: Cleaned up Apps page nav header structure (tabs + categories + search).
TASK-38: Added Bitcoin Core sync progress gauge to homepage System Stats card —
shows sync percentage, block height, and green/orange color coding. Only
appears when Bitcoin is running. Grid expands to 4 columns when visible.
Updated MASTER_PLAN.md — cleaned up completed sections, moved done items.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>