Fix: Auto-adjust filters on search and fix post pin position

1. Auto-clear category filters when searching
   - When user searches, set mainFilter and subFilter to "All"
   - Ensures search results are visible regardless of category
   - No more hidden results due to filter mismatch

2. Fix post pin offset after creation
   - New posts (< 10 seconds old) have NO smart offset
   - Respects crosshair position chosen by user
   - Pin appears exactly where user aimed
   - Older posts still get smart offset to avoid overlaps

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

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

src/components/Map/MapView.jsx

@@ -245,6 +245,12 @@ export default function MapView({
   const handleSearch = (query) => {
     console.log('[MapView] Search/filter by:', query);
     setSearchQuery(query);
+
+    // Clear category filters to show all search results
+    if (query.trim()) {
+      setMainFilter("All");
+      setSubFilter("All");
+    }
   };
 
   // Zoom intelligent: quand on cherche, zoom pour voir tous les résultats

src/components/Map/markerManager.js

@@ -314,6 +314,15 @@ function calculateSmartOffset(post, markersRef, map) {
   const lon = typeof post.lon === "number" ? post.lon : typeof post.lng === "number" ? post.lng : null;
   if (lat == null || lon == null) return { x: 0, y: 0 };
 
+  // Si le post est très récent (< 10 secondes), pas d'offset - respect de la position crosshair
+  const createdAt = post?.created_at || post?.CreatedAt || post?.createdAt;
+  if (createdAt) {
+    const ageSeconds = (Date.now() - new Date(createdAt).getTime()) / 1000;
+    if (ageSeconds < 10) {
+      return { x: 0, y: 0 };
+    }
+  }
+
   const currentPoint = map.project([lon, lat]);
   const PROXIMITY_THRESHOLD = 100; // pixels - larger to detect more overlaps