User confirmation action for things hard to undo like "Remove All Groups" #44
Description
For destructive actions like closing and removing things there is currently no user confirmation interaction which is a ux best practice.
Per the code - there is no user confirmation for "Remove Duplicates" or "Remove All Groups". Both actions execute immediately when clicked:
Remove Duplicates (popup.js:175-200): Directly sends { action: 'removeDuplicates' } and closes tabs without any confirmation dialog.
Remove All Groups (popup.js:310-330): Directly sends { action: 'removeGroups' } and ungroups all tabs immediately.
The only feature with a selection step is Restore from Bookmarks, which shows a folder picker before restoring. But that's selection, not confirmation. All other actions (organize, dedupe, save bookmarks, remove groups, combine groups) act immediately on click.