feat(studio): design panel, timeline polish, feature flag [6/6]

[miguel-heygen]

Summary

Property panel keyframe-aware editing. clip-path + filter UI. AnimationCard string props with presets. Timeline 48px tracks, diamond sizing, 0.1% precision. Feature flag defaults false.

Part 6 of 6 — final integration. Depends on PR 5.

Test plan

• Design panel X/Y edits update keyframes
• clip-path and filter editable via presets
• Flag off → no keyframe UI

[miguel-heygen]

Warning

This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
Learn more

• feat(studio): design panel, timeline polish, feature flag [6/6] #1172 👈 (View in Graphite)
• feat(studio): keyframe hooks wiring — session, cache, toolbar [5/6] #1171
• feat(studio): keyframe diamonds, navigation, context menu [4/6] #1170
• feat(studio): GSAP runtime bridge + optimistic updates [3/6] #1169
• feat(core): spring physics solver + runtime fixes [2/6] #1168
• feat(core): GSAP keyframe parsing, mutations, and API routes [1/6] #1167
• main

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