senke 0e063aafb3 feat(ui): unsaved changes warning + chat date separators ... Unsaved changes: - New useUnsavedChanges hook: browser beforeunload warning - New useFormDirtyState hook: isDirty/markDirty/markClean tracking - SettingsPage: wired up dirty tracking with markClean on save Chat date separators: - DateSeparator component with centered date label and hr lines - Inserted between messages from different days - Formats: Today, Yesterday, or full date (e.g. "Monday, February 10") Co-authored-by: Cursor <cursoragent@cursor.com>		2026-02-10 00:07:19 +01:00
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web	feat(ui): unsaved changes warning + chat date separators	2026-02-10 00:07:19 +01:00