@remotion/studio: Preselect filename stem in rename dialog

[Aditya07771]

What does this fix?

Fixes #8318

The rename dialog does not pre-select the filename correctly when it opens. The user has to manually position the cursor before editing.

What did I change?

• RenameStaticFile: on mount, call setSelectionRange(0, stemEnd) where stemEnd is the index of the last dot (or the full length if there is no dot). This selects my-video and leaves .mp4 unselected.
• RenameFolder / RenameComposition: call input.select() on mount since folder names and composition IDs carry no extension.

How to verify

1. Right-click any asset in Remotion Studio → Rename.
2. The dialog opens with my-video highlighted (not my-video.mp4).
3. Start typing to replace only the stem.
4. .mp4 is preserved unchanged.

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Project	Deployment	Actions	Updated (UTC)
bugs	Ready	Preview, Comment	Jun 12, 2026 6:55am
remotion	Ready	Preview, Comment	Jun 12, 2026 6:55am

[pullfrog]

✅ No new issues found.

Reviewed changes — this PR preselects the filename stem (or full input text) in Studio rename dialogs so users can immediately type to replace it, fixing #8318.

• RenameStaticFile.tsx — on mount, selects the filename stem via setSelectionRange(0, stemEnd), leaving the extension (e.g., .mp4) unselected.
• RenameComposition.tsx — on mount, selects all text via input.select() since composition IDs carry no extension.
• RenameFolder.tsx — same input.select() treatment as composition rename, since folder names have no extension.

RemotionInput forwards its ref to an underlying <input> element (RemInput.tsx:119), so the DOM selection APIs work correctly.

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[JonnyBurger]

Thank you!