Sync property list with map viewport

Major changes:
- Property list now updates when map pans/zooms
- Properties sorted by distance from map center (closest first)
- Shows "X properties in view" when viewport filtering active
- Min 30 properties required before grouping kicks in
- Added rule to CLAUDE.md: no commits unless asked

Backend:
- MLS_Query: Added bounds filtering and distance-based sorting
- AJAX handler: Accepts bounds/center, sorts by distance when provided

Frontend:
- Map move triggers property list refresh with same viewport
- Loop prevention flag to avoid map->filter->map recursion
- Resets to page 1 when viewport changes

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

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

wp-content/plugins/mls-by-hansonxyz/includes/class-mls-cluster.php

@@ -39,6 +39,12 @@ class MLS_Cluster {
      */
     const MAX_INDIVIDUAL_MARKERS = 500;
 
+    /**
+     * Minimum properties before any grouping kicks in
+     * Below this, always show individual markers
+     */
+    const MIN_FOR_GROUPING = 30;
+
     /**
      * Zoom thresholds for visualization modes
      */
@@ -270,6 +276,11 @@ class MLS_Cluster {
             $total = (int) $wpdb->get_var($count_sql);
         }
 
+        // If very few properties, always show individual markers (no grouping)
+        if ($total < self::MIN_FOR_GROUPING) {
+            return $this->get_individual_markers($where_sql, $values, $total);
+        }
+
         // Calculate center latitude for Mercator adjustment
         $center_lat = 45.0; // Default Minnesota
         if ($args['bounds'] && count($args['bounds']) === 4) {