TV Station Update — Playout & Startup Improvements — TV Station Steam update #3674008

This update addresses critical transition bugs between the active queue and the scheduled fallback, along with a major startup performance optimization. Bug Fixes & Improvements Queue-to-Schedule Transitions: Resolved a state issue where pausing or clearing the queue failed to cleanly hand control back to the regular schedule. Schedule playback now resumes instantly without requiring a application restart. Schedule State Tracking: Implemented proper state guards (current_running_schedule_id) for the schedule fallback system to prevent redundant heartbeat commands from re-triggering mid-stream playback. VLC Thread & Signal Stability: Fixed signal cascade race conditions and thread lockups during manual media switches, ensuring video transitions and completion events trigger reliably. Performance Faster Cold-Boot Startup: Generated and bundled the LibVLC plugins.dat index cache. The applic...