Lightningbeam v1.0.6-alpha

1.0.6-alpha:

Changes:

• Hardware-accelerated H.264 video export: each frame is rendered and encoded on the GPU (zero-copy VAAPI), roughly 2x faster, with automatic fallback to software encoding when hardware acceleration isn't available (Linux, Intel/AMD only for now)
• Video export now runs on a background thread, so the UI stays responsive during export
• Grouped and nested video clips now composite on the GPU path
• Video is now packed into and streamed from the .beam project container

Bugfixes:

• Fix an export hang when a video's audio track is shorter than the video
• Fix a sample key-range overlap bug in instruments