Police Pagination

[VidurShah]

Wide date ranges on the police view could render hundreds of party cards at once, overloading the browser.

Changes:

• Added pagination to the police party list (10 entries per page), mirroring the shadcn Pagination controls used on the staff view
• Clicking a map pin still navigates to the correct page and scrolls the card into view
• Fixed a 422 caused by page_size: 200 exceeding the backend max — police query now omits page_size to fetch all parties in the date range (required for client-side filters to work across the full result set)
• Fixed party_datetime_lte being sent as midnight instead of end of day, which caused the default single-day filter to return no results

Closes #277

[github-actions]

Test Results Summary

551 tests  ±0   551 ✅ ±0   38s ⏱️ -1s
  1 suites ±0     0 💤 ±0 
  1 files   ±0     0 ❌ ±0 

Results for commit 2a77c1c. ± Comparison against base commit 46dbc32.