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The handler fired four separate commands (asset add, split, move, insert),
producing four undo steps. It now builds one BatchCommand and executes it
once. The new ShiftSplitRemainderCommand resolves the split's right-side
elements lazily at execute() so it can be composed after the split in the
batch, and rebuilds the inner move on redo since a re-executed split
generates fresh element ids.
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Enable the timeline toolbar freeze-frame button: capture the composited
canvas as PNG, add it as an image media asset, split the video element
at the playhead, shift the right part by the freeze duration, and insert
a 3-second image element in the gap. Adds RendererManager.captureFrame(),
reused by createSnapshot().
Also adds the Nix devshell (flake.nix/flake.lock: bun + nodejs) and
AGENTS.md repository guidelines.
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