tests: coverage round 8 (serialization, folder, text/polygon, probe, render tail)
- node_save_load_test: Node Save/Load round trips for values, keyframes, hints, caches, connections, positions - node_polygon_folder_test: Folder child management, PolygonGenerator rasterization/gizmos, TextGeneratorV1/V2 - footage_probe_test: real FFmpeg/OIIO probing of demo.mp4/img.png, metadata cache, footage state transitions - render_tail_test: DynamicRenderer, color-context shader plumbing, PreviewAutoCacher pause/clear paths, DiskManager edges, AudioPlaybackCache segment I/O Also fixes AudioPlaybackCache::WritePartOfSampleBuffer, found by the new tests: zero padding was written via QFile::write(const char*) which treats the buffer as a NUL-terminated string, so no padding bytes were ever written; the write length was also computed from the segment end instead of the range end, making WriteSilence() spin forever on an empty buffer
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