- Changes panel: Preview beside Whole file opens the page in a modal
(HtmlViewerModal, shared with the File Explorer) instead of inside the
panel; Changes and Whole file stay as they were.
- Chat: an HTML file's card, Outputs row or a path in a reply (in the
workspace or not) opens FilePreview as a modal — Preview | Code, versions,
Save to Artifacts kept — rather than the side panel or the Changes panel.
- Esc closes both modals: they stop every key from reaching the view below,
which also kept useDialog's document listener from seeing it.
