Files
hyperframes/packages
Miguel Ángel 5a4dd8bec1 fix: gate studio timeline actions by capability (#415)
## Summary
- gate timeline actions to clips Studio can control deterministically
- disable direct move/trim for generic GSAP-timed DOM clips
- add an in-clip `Copy to Agent` fallback for unsupported edits

## Why
Studio should only advertise timeline actions it can round-trip to source HTML with deterministic meaning.

This PR now follows that stricter rule:
- direct move/end-trim are only exposed for clips with a deterministic timeline window
- start trim is only exposed for clips with a real content-offset model
- unsupported motion clips now offer `Copy to Agent` so users still have a fast path to request source-level timing changes

In practice this means generic GSAP-authored DOM clips no longer pretend Studio can rewrite their visible timing just by patching `data-start` / `data-duration`.

## What changed
- added `hasPatchableTimelineTarget()` and `getTimelineEditCapabilities()` in `timelineEditing.ts`
- tightened deterministic-window detection so only media, images, and composition hosts keep direct move/end-trim controls
- kept wrapped media clips editable by recognizing real media metadata even when the host tag is a `div`
- updated `TimelineClip` / `Timeline` to guard interactions with the shared capability model
- added `buildTimelineElementAgentPrompt()` and a `Copy to Agent` fallback button for unsupported clips
- added focused tests for capability derivation and the agent-prompt helper

## Verification
### Automated
- `bun test packages/studio/src/player/components/timelineEditing.test.ts packages/studio/src/player/components/Timeline.test.ts packages/studio/src/player/store/playerStore.test.ts packages/studio/src/utils/sourcePatcher.test.ts`
- `bun run --filter @hyperframes/studio typecheck`
- `bunx oxlint packages/studio/src/player/components/Timeline.tsx packages/studio/src/player/components/timelineEditing.ts packages/studio/src/player/components/timelineEditing.test.ts packages/studio/src/player/components/TimelineClip.tsx`
- `bunx oxfmt --check packages/studio/src/player/components/Timeline.tsx packages/studio/src/player/components/timelineEditing.ts packages/studio/src/player/components/timelineEditing.test.ts packages/studio/src/player/components/TimelineClip.tsx`

### Browser
Verified in Studio with live browser automation against `http://127.0.0.1:4175/#project/timeline-edit-playground`:
- generic GSAP-timed clips (`feature-card`, `title-card`, `prompt-card`) show `Copy to Agent` and no direct move/trim affordances
- wrapped media (`media-card`) still exposes direct controls and remains draggable
- the local playground timings were realigned to match the authored GSAP positions, so preview visibility now matches the timeline windows during manual testing

Recording artifacts used during verification:
- `/tmp/timeline-capabilities-proof/capabilities-flow.webm`
- `/tmp/timeline-capabilities-proof/capabilities-agent-flow.webm`
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