Drag to reorder active tracking categories (v0.22.0-beta.1)

[mapgie]

Summary

• Long-press the drag handle on any active tracking category to pick it up and drag it to a new position
• Items animate smoothly into place as you drag
• New order is written to displayOrder on release and persists across app restarts
• Works alongside the existing swipe-to-archive and swipe-to-delete gestures
• No DB migration needed: displayOrder column already exists on TrackingCategory

Rebased onto current main (v0.21.2-beta.1). Supersedes #82.

Note: Both this PR and #88 use versionCode 58. Whoever merges second should bump versionCode to 59.

Test plan

• Long-press a drag handle and drag up/down — categories swap positions
• Release drag — order persists after closing and reopening the screen
• Swipe-to-archive and swipe-to-delete still work after reordering
• Archived categories section is unaffected by drag
• No regression in bottom nav or other screens

https://claude.ai/code/session_01AGmvoYfqqkLA9SUWV6myXW

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