EXIF round-trip: read before upload, re-embed server-side

- Client: exifr.parse() reads full EXIF before upload, sent as exif_data
- Server: piexif re-embeds EXIF into saved JPEG after upload
- Auto-extract GPS from picked gallery photos on selection
- Removed Google Photos button (needs OAuth, not feasible)

static/index.html

@@ -502,7 +502,7 @@
        MODE TOGGLES (Add Asset tab)
        ═══════════════════════════════════════════════════════════════════════ */
     .mode-toggles {
-      display: flex; gap: 4px; margin-bottom: 10px;
+      display: flex; flex-wrap: wrap; gap: 4px; margin-bottom: 10px;
       background: var(--card2); border-radius: var(--radius-sm); padding: 4px;
     }
     .mode-toggle {
@@ -1725,6 +1725,9 @@
         // Extract EXIF / file metadata
         extractExifData(file);
 
+        // Auto-extract GPS from the picked photo
+        tryExtractGpsFromPicked();
+
         // Scroll to preview
         document.getElementById('photoPreviewCard').scrollIntoView({ behavior: 'smooth' });
       };
@@ -2467,7 +2470,7 @@
     // MANUAL MODE — Photo
     // ═══════════════════════════════════════════════════════════════════════
     let manualPhotoFile = null;
-    let manualPhotoBlob = null;
+    manualPhotoBlob = null;    // reuse existing declaration
     let manualPhotoGps = null;
 
     async function handleManualPhotoFile(event) {
@@ -2524,13 +2527,16 @@
       if (manualPhotoFile) {
         try {
           const fd = new FormData();
+          // Read EXIF before upload (defense against transport stripping)
+          try {
+            const exifData = await exifr.parse(manualPhotoFile);
+            if (exifData && Object.keys(exifData).length > 0) {
+              fd.append('exif_data', JSON.stringify(exifData));
+            }
+          } catch (_) { /* EXIF extraction is best-effort */ }
           fd.append('file', manualPhotoFile, manualPhotoFile.name || 'photo.jpg');
           const upData = await api('/api/upload/photo', { method: 'POST', body: fd });
           photoPath = upData.path;
-          // If server returned EXIF GPS and we don't have GPS from the file yet, use it
-          if (upData.exif_gps && !manualPhotoGps) {
-            manualPhotoGps = upData.exif_gps;
-          }
         } catch (e) { /* photo upload failed, continue without */ }
       }