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Highlights:\n- Fix: Ensure dataset chooser is visible/usable on mobile by toggling the left pane visibility when choosing/switching datasets.\n- UX: Header reflow on small screens (logo/title first line; controls second; smaller title).\n- Cleanup: Removed dataset-control component; deprecated tests replaced with placeholders.\n- Tests: Stabilized headless suite by emitting first dataset selection immediately; dynamic pageSize (5 on mobile, 25 desktop).\n\nMerged via PR #12: https://github.com/mutazag/ChatExplorer/pull/12\n\nVerify:\n- At <=768px, use ‘Select Export Folder’ to view datasets; selecting one hides the left pane; switching via ‘Change Dataset’ works.\n- Headless tests pass in CI (browser harness).