- MailFolderTree: reduce padding/gap ~25% (py-2→py-1, gap-2→gap-1.5)
- MailList: text-sm→text-xs for from and subject lines
- ResizablePanel: use DOM ref for width during drag instead of React state
- No re-renders during drag, only single setWidth on mouseup
- panelRef on outer div, contentRef on inner div
- pointer-events:none on content during drag
- contain:strict on content area
Agent Zero
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