Reverted the player and ad-handling runtime completely to the stable QuietBreak 1.3.6 implementation.

QuietBreak 1.3.9 release notes
- Reworked ad handling from the stable QuietBreak 1.3.6 player implementation.
- Removed playback changes that could cause repeated loading and increased broadcaster latency.
- Avoids expensive finite-video and video-pair searches during normal live playback.
- Detects later mid-roll ads through main-player media transitions.
- Preserves immediate pre-roll detection when opening or switching channels.
- Prevents ordinary subscriber and secondary-video playback from falsely activating QuietBreak.
- Mutes before moving either video feed.
- Places the continuing stream in the main viewport and the muted ad in the upper-right corner when Twitch provides both feeds.
- Restores the original Twitch layout and sound state when the ad finishes.

QuietBreak 1.3.8 release notes
- Reduced background processing and potential Twitch player disruption.
- Reduced fallback player scans by 80% while retaining immediate media-event detection.
- Prevented chat messages and unrelated Twitch page updates from triggering player scans.
- Prevented short live-buffer windows during reconnects or quality changes from being mistaken for ads.
- Mid-roll detection now requires a confirmed transition from normal live playback to a short ad clip near its beginning.
- Preserved immediate pre-roll detection when opening or switching channels.
- Continues to mute before swapping video feeds.
- Keeps the continuing streamer feed in the main viewport and the muted ad in the upper-right corner when Twitch supplies a playable preview.
- Restores the normal layout and previous sound state after the ad ends.

• Added live muted-ad time statistics for the current session and the extension’s lifetime, with a single reset option for both counters.

• QuietBreak now turns on automatically whenever you open Twitch, while respecting manual per-tab disabling.