Kept 1.6.3

Fixes

• Fix expired-session note saves so 401 responses show a session-expired message and keep unsaved note drafts open instead of failing silently.
• Improve Google Takeout imports with disk-backed uploads, a configurable 5 GB default cap, temp-file cleanup, and clearer upload/proxy error guidance.
• Fix imported checklist handling by normalizing legacy/string checklist item IDs without affecting newly created checklists.
• Improve dark-mode styling for plain/raw links when rich previews are disabled.
• Fix mobile pinned-note icon contrast on light and dark note backgrounds.

Improvements

• Add a note preview text size and density setting with Compact, Default, and Large options for overview cards.
• Document native-app CORS behavior for configured origins.