@remotion/studio: Batch delete effects

[JonnyBurger]

Summary

• Batch /api/delete-effect so multiple effect deletions are processed in one request.
• Delete all effects through the same endpoint when the effects group row is selected.
• Update Studio callers to use the array request shape.

Fixes #7862

Test plan

• bun test packages/studio-server/src/test/delete-effect.test.ts packages/studio/src/test/timeline-selection.test.ts
• bunx turbo make --filter='@remotion/studio-shared' --filter='@remotion/studio-server' --filter='@remotion/studio'
• bun run build
• bun run formatting

[pullfrog]

Pullfrog stalled

The agent stopped emitting events for 303s and was killed by the activity-timeout watchdog. 55 events were processed before the failure.

Recent agent stderr

INFO  2026-05-31T15:45:33 +50ms service=bus type=message.part.delta publishing
INFO  2026-05-31T15:45:33 +55ms service=bus type=message.part.delta publishing
INFO  2026-05-31T15:45:33 +110ms service=bus type=message.part.delta publishing
INFO  2026-05-31T15:45:33 +36ms service=bus type=message.part.delta publishing
INFO  2026-05-31T15:45:33 +16ms service=bus type=message.part.delta publishing
INFO  2026-05-31T15:45:33 +48ms service=bus type=message.part.delta publishing
INFO  2026-05-31T15:45:33 +74ms service=bus type=message.part.delta publishing
INFO  2026-05-31T15:45:33 +44ms service=bus type=message.part.delta publishing
INFO  2026-05-31T15:45:33 +99ms service=bus type=message.part.delta publishing
INFO  2026-05-31T15:45:33 +32ms service=bus type=message.part.delta publishing
INFO  2026-05-31T15:45:33 +20ms service=bus type=message.part.delta publishing
INFO  2026-05-31T15:45:33 +75ms service=bus type=message.part.delta publishing
INFO  2026-05-31T15:45:33 +38ms service=bus type=message.part.delta publishing
INFO  2026-05-31T15:45:33 +49ms service=bus type=message.part.delta publishing
INFO  2026-05-31T15:45:33 +48ms service=bus type=message.part.delta publishing
INFO  2026-05-31T15:45:33 +52ms service=bus type=message.part.delta publishing
INFO  2026-05-31T15:45:33 +53ms service=bus type=message.part.delta publishing
INFO  2026-05-31T15:45:33 +48ms service=bus type=message.part.delta publishing
INFO  2026-05-31T15:45:34 +86ms service=bus type=message.part.delta publishing
INFO  2026-05-31T15:45:34 +26ms service=bus type=message.part.delta publishing

  ^{｜ Rerun failed job ➔ ｜ View workflow run ｜ via Pullfrog ｜ Using Kimi K2 ｜ 𝕏}

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Project	Deployment	Actions	Updated (UTC)
bugs	Ready	Preview, Comment	May 31, 2026 3:43pm
remotion	Ready	Preview, Comment	May 31, 2026 3:43pm