Add parentVersionId/branchLabel to versions, enabling git-style branching.
New /tree and /promote endpoints; VersionGraph (SVG) component as toggle
next to the existing list view. Upload dropzone accepts a parent for branch
uploads.
Add public share links: new share_links table, /api/v1/share router with
authenticated CRUD and a public /public/:token endpoint serving signed
stream/waveform URLs. Comments now allow guests (nullable userId, guestName)
so artists can leave timestamped feedback without an account. New
/listen/:token standalone page with password gate, optional download, and
guest comment form.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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