Narrow address autocomplete to residences in the Chapel Hill area

[naasanov]

Address autocomplete previously surfaced results that aren't valid residences to register: bare streets (a whole road with no house number) and addresses far outside the area (location + radius only bias legacy Place Autocomplete, so identically-named streets in other states leaked through). This tightens suggestions to specific dwellings near Chapel Hill, and makes the empty state more actionable.

Changes:

• Filter out bare-street (route-only) predictions in autocomplete_address; only suggest precise addresses (street_address, premise, subpremise)
• Add strict_bounds=True so results are restricted to the radius around Chapel Hill instead of merely biased, and tighten the radius to 10km
• Add a browserAutocomplete prop to AddressSearch (default on) and disable the native browser autocomplete on the police search so it doesn't fight the custom dropdown
• Update the empty-state copy to "No addresses found. Make sure to include the full street address."
• Extend the gmaps test util with prediction types and add coverage for bare-street filtering vs. precise addresses

Closes #462

[github-actions]

Test Results Summary

856 tests  +2   856 ✅ +2   1m 3s ⏱️ +3s
  1 suites ±0     0 💤 ±0 
  1 files   ±0     0 ❌ ±0 

Results for commit 984fd59. ± Comparison against base commit 12998e1.

♻️ This comment has been updated with latest results.