UI consolidation:
- One Export entry (rail) opens a popup menu: Conform Timeline -> MAM and
Local Export. Retires the standalone Export & Conform / Fetch & Relink
dock buttons and the plain "Push Timeline" flow.
- Remove Import All.
- New "Upload to MAM" dock button.
Upload: reads the highlighted project-panel item(s) via the premierepro
API (best-effort, guarded) and falls back to a native file picker. Pushes
via /upload/simple (small) or chunked init/part/complete (large).
Local Export: batch-trim the timeline's hi-res clips server-side (FFMPEG),
poll trim-status, download each temp-segment-url, relink in Premiere.
Relink keys on source media path (last-wins for multi-use sources).
Conform + Local Export auto-upload any timeline sources not yet in the MAM
before proceeding (renders from the hi-res original, available post-upload).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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