A sidebar that automatically snapshots the note every few minutes or after major edits. Key Components:
A "Revert to this version" button that instantly replaces the current text with the historical data.
When clicking a previous version, the app highlights what was added (green) or removed (red) compared to the current version.
A list in the sidebar (e.g., "Today, 8:41 AM") showing when changes were made.
Even if the user isn't logged in, the app saves the last 10 versions to the browser's local cache so they survive a tab crash.
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