Fix map center drift by using geographic center instead of bounds center

Problem: Map position drifted north/higher on each reload because
bounds.getCenter() returns a visually offset center when pitch is applied

Solution:
- Use map.getCenter() for accurate geographic center (not affected by pitch)
- Save and restore bearing (rotation) along with pitch
- Store: lat, lon, zoom, pitch, bearing

Before: bounds.getCenter() → visual center (offset by 3D tilt)
After: map.getCenter() → true geographic center

This ensures the map returns to the exact same position after reload,
regardless of the 3D tilt angle.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

src/components/Map/useMapCore.js

@@ -84,6 +84,10 @@ export function useMapCore(theme) {
           map.setZoom(v.zoom);
           // Restore pitch from storage, default to 45 if not saved
           map.setPitch(typeof v.pitch === "number" ? v.pitch : 45);
+          // Restore bearing (rotation) if saved
+          if (typeof v.bearing === "number") {
+            map.setBearing(v.bearing);
+          }
           hadLastView = true;
         }
       }
@@ -114,14 +118,17 @@ export function useMapCore(theme) {
       const vp = getViewFromMap(map);
       setViewParams(vp);
       try {
-        const center = vp.center;
+        // Use map.getCenter() directly for accurate geographic center
+        // (bounds.getCenter() can be offset when pitch is applied)
+        const center = map.getCenter();
         localStorage.setItem(
           LAST_VIEW_KEY,
           JSON.stringify({
-            lat: center[1],
-            lon: center[0],
+            lat: center.lat,
+            lon: center.lng,
             zoom: map.getZoom(),
-            pitch: map.getPitch()
+            pitch: map.getPitch(),
+            bearing: map.getBearing()
           })
         );
       } catch {}