feat(studio): route GSAP tween add/update/delete through SDK (§3.5 PR1)

[vanceingalls]

Summary

• sdkGsapTweenPersist helper added to sdkCutover.ts — routes add/set/remove GSAP tween ops through the SDK's acorn/magic-string path, with server fallback on SDK miss/error
• addGsapAnimation (from/to/fromTo only), updateGsapMeta, deleteGsapAnimation in useGsapAnimationOps now try SDK first
• updateGsapProperty, addGsapProperty, updateGsapFromProperty, addGsapFromProperty in useGsapPropertyDebounce now try SDK first
• removeGsapProperty / removeGsapFromProperty stay server-authoritative: null ≠ removal in upsertProp; deleteAllForSelector stays server-authoritative: no SDK op
• addGsapAnimation with method = "set" stays server-authoritative: GsapTweenSpec has no set method
• 5 new unit tests for sdkGsapTweenPersist

Open decisions

• removeGsapProperty/removeGsapFromProperty: upsertProp in the acorn writer treats null as a literal null value, not removal. To support removal via SDK, a removeGsapProperty SDK op would be needed (separate PR or accepted as server-authoritative for now).
• deleteAllForSelector: no SDK op exists. Stays server-authoritative.
• addGsapAnimation with method = "set": GsapTweenSpec doesn't have a set method; stays server-authoritative.

Test plan

• Build passes (bun run build)
• Tests pass (bun run test) — 37 sdkCutover tests
• Lint/format clean
• 600-line Studio gate passes
• Manual: open Studio on a GSAP comp, add/edit/delete a tween, confirm sdk_cutover_success telemetry fires and undo works

🤖 Generated with Claude Code

[vanceingalls]

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

• fix(studio): resolve cross-cutting SDK-cutover review findings #1471
• feat(studio): route GSAP keyframe add through SDK (§3.5 PR2) #1470
• feat(studio): route GSAP tween add/update/delete through SDK (§3.5 PR1) #1469 👈 (View in Graphite)
• chore(studio): document CSS-path position cut-over; GSAP-path deferred (§3.3) #1467
• feat(studio): route timeline trim/move through SDK setTiming (§3.2) #1466
• feat(studio): route element delete through SDK removeElement (§3.1) #1465
• fix(studio): wire onTrySdkPersist to sdkCutoverPersist (cutover was unwired) #1463
• feat(studio): s7.5 — make sdk cutover always-on, delete shadow scaffolding #1462
• fix(studio): force-reload sdk session after undo/redo bypasses suppress window #1460
• main

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