refactor(windows): rewrite native player

[kdroidFilter]

Fixes #139.

Summary

Large refactor of the Windows backend (native DLL + Kotlin state). Cleans up a number of long-standing stability issues along the way.

Native

• Full migration to ComPtr and RAII wrappers (new ComHelpers.h); no more manual Release() / CloseHandle.
• Responsibilities split across AudioManager, MediaFoundationManager, HLSPlayer, NativeVideoPlayer.
• Audio is now the timing master. Video compensates via audioLatencyMs; the old wall-clock drift correction / sleep / sample dropping is gone.
• AcquireNextSample drops late frames in a tight native loop and caches early ones — it never replays stale frames.
• 300 ms safety timeout on the cached sample so a stalled audio clock cannot freeze the picture indefinitely.
• Dedicated audio IMFSourceReader — video ReadSample no longer serialises with audio.
• MFVideoFormat_RGB32 alpha byte forced opaque with AVX2 (scalar fallback) to avoid washed-out colours in Skia compositing.
• ShutdownMediaFoundation can now be forced on JVM shutdown so MF worker threads exit before the DLL is unloaded.

Kotlin (WindowsVideoPlayerState)

• JVM shutdown hook calls ShutdownMediaFoundation() — fixes a 0x87A KERNELBASE crash on window close.
• dispose() runs native cleanup synchronously and joins the producer coroutine before freeing the reader (no more UAF race with pSourceReader.Reset()).
• Seek coalescing via pendingSeekTarget + seekInFlight. The producer stays alive across seeks (serialised with videoReaderMutex + isSeeking).
• consumeFrames no longer clobbers _progress while userDragging is true, so dragging the slider commits the seek where the user released.
• processOneFrame stops closing the double-buffer bitmaps on resolution change — fixes a Skia use-after-free visible as Image.makeFromBitmap null deref.
• Per-instance volume persistence; cleaner error reporting on loop / seek failures.

Test plan

• Play / pause / seek (click + drag) / playback-speed change on a local H.264 file
• Close the window while a video is playing → clean exit, no 0x87A hs_err
• HLS stream: play, seek inside the live window, EOF handling
• Resize the window repeatedly during playback → no crash, no stuck frame