@remotion/studio: Open assets in new window

[JonnyBurger]

Summary

• add an "Open in new window" action to asset selector context menus
• share the existing centered popup behavior between assets and compositions
• cover Studio route opening and popup positioning with a regression test

Testing

• bun test src in packages/studio (452 tests passed)
• bun run build
• bun run stylecheck

Closes #9365

[vercel]

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Project	Deployment	Actions	Updated (UTC)
bugs	Ready	Preview, Comment	Jul 21, 2026 5:40am
remotion	Ready	Preview, Comment	Jul 21, 2026 5:40am

[pullfrog]

✅ No new issues found.

Reviewed changes — add an "Open in new window" action to asset selector context menus, extract the existing centered-popup logic from CompositionSelectorItem into a shared getOpenInNewWindowMenuItem helper, and cover the shared helper with a unit test.

• Add "Open in new window" item for assets in AssetSelectorItem — reuses the shared helper with an /assets/${relativePath} route, consistent with existing asset navigation.
• Extract shared popup helper into open-in-new-window.ts — preserves the existing centering math and getUrlForRoute query-string handling for read-only studios.
• Add regression test open-in-new-window.test.ts — verifies route resolution and popup dimensions/positioning with a mocked window.

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