Fix distance filtering persistence and add geofence debugging

[Copilot]

Distance-based ping filtering (25m) was not persisting error state - button became unclickable but status cleared prematurely. Geofence (150km) wasn't blocking pings from London (5361km away).

Changes

Distance Filtering

• Added checkLocationRestrictions() running every 1s to continuously monitor location vs last ping
• Manual mode: button stays enabled, shows persistent "Haven't moved far enough. Need X.Xm more" until user moves ≥25m
• Auto mode: shows "Haven't moved far enough (need X.Xm), waiting for next ping (Xs)" with countdown
• State flags tooCloseToLastPing / outsideGeofence centrally managed to avoid race conditions

Geofence Debugging

• Added extensive console logging for geofence checks:

  console.log(`Checking geofence for location: ${lat.toFixed(5)}, ${lon.toFixed(5)}`);
  console.log(`[Geofence] Distance: ${distanceKm}km | Limit: 150km | InBounds: ${inBounds}`);

• Added GPS coordinate validation (lat == null instead of !lat to allow 0 coordinates)
• Geofence logic unchanged from PR Add 25m distance filtering and 150km Ottawa geofence to wardriver pings #38 but now instrumented to diagnose why London pings weren't blocked

State Management

• Removed duplicate state updates in sendPing() - checkLocationRestrictions() is now single source of truth
• GPS watch updates trigger location restriction checks immediately

Testing

Console will show detailed geofence logs on dev. If London pings still succeed, logs will reveal why (likely browser cache, GPS permission denied, or deployment timing).

Distance reference: Ottawa 0km ✅, Kingston 146km ✅, Montreal 166km ❌, London 5361km ❌

Original prompt

Okay the last agent request and merge was supposed to implment

1. Distance-Based Ping Filtering (25m Radius)

-This kinda works but im confused, It seems to let me send 2 pigns within the same area but then when I try manually a third the button is not clickable and nothing happens.
-When in a manual ping is sent, the status should change to have not traveled far enough and it shouldnt change back to idle after this error until the user has traveled more then that and a successful ping goes out. THen it can go back to idle. The same thing should happen when in auto ping mode but maybe the status should say, "Have not moved far eough, waiting for next ping (timer as it is now)"

and

2. Ottawa Regional Geofence (100km radius)

-This 100% did not work and I still still send requests outside of this radius

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