@remotion/studio: Add composition quick action

[JonnyBurger]

Summary

• add an "Add composition..." quick action to the composition inspector
• let the quick switcher return a selected composition without navigating away
• insert the selected composition through the existing canvas-drop insertion path

Verification

• bun run build
• bun run stylecheck
• bunx turbo run test --filter='@remotion/studio' --no-update-notifier (534 tests)

Closes #9749

[vercel]

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Project	Deployment	Actions	Updated (UTC)
bugs	Ready	Preview, Comment	Jul 28, 2026 4:34pm
remotion	Ready	Preview, Comment	Jul 28, 2026 4:34pm

[pullfrog]

Reviewed changes — adds an "Add composition..." quick action to the composition inspector that reuses the existing canvas-drop composition insertion path through insertComposition.

• Add "Add composition..." button to CompositionInspector — visible under the same conditions as "Add asset..." (canShowInsertAsset), with a FilmIcon and loading guard (isAddingComposition).
• Extend quick switcher with compositionSelection callback — when non-null, forces compositions mode, hides the mode selector, starts with an empty query, and calls onSelected instead of navigating to the composition.
• Wire onCompositionSelected in useCompositionActions — resolves the selected composition's source file via stack trace or browserStudioOperations, constructs drag data, and delegates to the existing insertComposition from import-assets.
• Add compositionSelection to ModalState type — threaded through QuickSwitcher, QuickSwitcherContent, and Modals; all existing call sites pass null.

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