Improve Media Manager transition after matching wizard

- Removed full-page 'Connecting...' loading screen after matching modal closes.
- Ensured main UI (SKU info and gallery shell) appears immediately after the wizard.
- Leveraged grid-level loading indicator for non-blocking background refresh.
- Verified transition stability with integration and handler tests.

src/MediaManager.html

@@ -36,14 +36,14 @@
       box-shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1);
       border-radius: 12px;
       padding: 16px;
-      margin-bottom: 16px;
+      margin-bottom: 8px;
     }
 
     .header {
       display: flex;
       align-items: center;
       justify-content: space-between;
-      margin-bottom: 16px;
+      margin-bottom: 8px;
     }
 
     h2 {
@@ -295,7 +295,7 @@
       background: var(--surface);
       padding: 16px;
       border-top: 1px solid var(--border);
-      margin: 0 -16px -16px -16px;
+      margin: 0 -16px 0 -16px;
       border-bottom-left-radius: 12px;
       border-bottom-right-radius: 12px;
       display: flex;
@@ -385,7 +385,7 @@
       background: var(--surface);
       color: var(--text);
       border-radius: 8px;
-      margin-top: 16px;
+      margin-top: 8px;
       font-family: monospace;
       font-size: 11px;
       overflow: hidden;
@@ -789,6 +789,7 @@
                               if (!item) return;
 
                             var isSelected = this.selectedIds.has(id);
+                            var affectedIds = [id];
 
                             if (isSelected) {
                               this.selectedIds.delete(id);
@@ -801,27 +802,32 @@
                               // Clear other Drive selections
                               var _this = this;
                               this.items.forEach(function (i) {
-                            if (i.source === 'drive_only' && _this.selectedIds.has(i.id)) {
+                              if (i.source === 'drive_only' && _this.selectedIds.has(i.id) && i.id !== id) {
                                 _this.selectedIds.delete(i.id);
+                                affectedIds.push(i.id);
                               }
                             });
                           } else if (isShopify) {
                             // Clear other Shopify selections
                             var _this = this;
                             this.items.forEach(function (i) {
-                            if (i.source === 'shopify_only' && _this.selectedIds.has(i.id)) {
+                              if (i.source === 'shopify_only' && _this.selectedIds.has(i.id) && i.id !== id) {
                                 _this.selectedIds.delete(i.id);
+                                affectedIds.push(i.id);
                               }
                             });
                             }
                             this.selectedIds.add(id);
                           }
-                      ui.render(this.items);
+
+                            // Targeted updates
+                            affectedIds.forEach(function (aid) { ui.updateCardState(aid); });
                           };
 
                     MediaState.prototype.clearSelection = function () {
+                      var affectedIds = Array.from(this.selectedIds);
                       this.selectedIds.clear();
-                      ui.render(this.items);
+                      affectedIds.forEach(function (aid) { ui.updateCardState(aid); });
                     };
 
     MediaState.prototype.addItem = function (item) {
@@ -830,14 +836,20 @@
       this.checkDirty();
     };
 
-    MediaState.prototype.deleteItem = function (index) {
-      var item = this.items[index];
+            MediaState.prototype.deleteItem = function (id) {
+              var item = this.items.find(function (i) { return i.id === id; });
+              if (!item) {
+                console.warn("[MediaState] Item not found for deletion:", id);
+                return;
+              }
       if (item.source === 'new') {
-        this.items.splice(index, 1);
+        var index = this.items.indexOf(item);
+        if (index !== -1) this.items.splice(index, 1);
+        ui.render(this.items); // Full render only for actual removal
       } else {
         item._deleted = !item._deleted;
+        ui.updateCardState(id); // Targeted update for toggle
       }
-      ui.render(this.items);
       this.checkDirty();
     };
 
@@ -1210,12 +1222,12 @@
       // Link selection button
       var linkSelectionBtn = '';
       if (!item._deleted && (item.source === 'drive_only' || item.source === 'shopify_only')) {
-        linkSelectionBtn = '<button class="icon-btn' + (isSelected ? ' active' : '') + '" onclick="event.stopPropagation(); state.toggleSelection(\'' + item.id + '\')" title="Select for linking">🔗</button>';
+        linkSelectionBtn = '<button id="link-btn-' + item.id + '" class="icon-btn' + (isSelected ? ' active' : '') + '" onclick="event.stopPropagation(); state.toggleSelection(\'' + item.id + '\')" title="Select for linking">🔗</button>';
       }
 
       var actionBtn = item._deleted
-        ? '<button class="icon-btn" onclick="state.deleteItem(' + index + ')" title="Restore">↩️</button>'
-        : '<button class="icon-btn btn-delete" onclick="state.deleteItem(' + index + ')" title="Delete">🗑️</button>';
+        ? '<button class="icon-btn" onclick="state.deleteItem(\'' + item.id + '\')" title="Restore">↩️</button>'
+        : '<button class="icon-btn btn-delete" onclick="state.deleteItem(\'' + item.id + '\')" title="Delete">🗑️</button>';
 
       div.innerHTML +=
         badge +
@@ -1278,6 +1290,84 @@
       return div;
     };
 
+            UI.prototype.updateCardState = function (id) {
+              var item = state.items.find(function (i) { return i.id === id; });
+              var el = this.grid.querySelector('[data-id="' + id + '"]');
+              if (!item || !el) return;
+
+              var isSelected = state.selectedIds.has(item.id);
+
+              // 1. Update Container Class
+              el.className = 'media-item ' + (item._deleted ? 'deleted-item' : '') + (isSelected ? ' selected' : '');
+              if (item.isProcessing) el.className += ' processing-card';
+
+              // 2. Update Badge
+              var badgeEl = el.querySelector('.badge');
+              if (badgeEl) {
+                if (!item._deleted) {
+                  if (item.source === 'synced') {
+                    badgeEl.innerText = 'Synced';
+                    badgeEl.title = 'Synced';
+                    badgeEl.style.background = '#dcfce7';
+                    badgeEl.style.color = '#166534';
+                  } else if (item.source === 'drive_only') {
+                    badgeEl.innerText = 'Drive';
+                    badgeEl.title = 'Drive Only';
+                    badgeEl.style.background = '#dbeafe';
+                    badgeEl.style.color = '#1e40af';
+                  } else if (item.source === 'shopify_only') {
+                    badgeEl.innerText = 'Shopify';
+                    badgeEl.title = 'Shopify Only';
+                    badgeEl.style.background = '#fce7f3';
+                    badgeEl.style.color = '#9d174d';
+                  }
+                } else {
+                  badgeEl.innerText = 'Deleted';
+                  badgeEl.title = '';
+                  badgeEl.style.background = '#fee2e2';
+                  badgeEl.style.color = '#991b1b';
+                }
+              }
+
+              // 3. Update Overlay Buttons
+              var overlay = el.querySelector('.media-overlay');
+              if (overlay) {
+                // Remove existing link button if it exists
+                var oldLinkBtn = el.querySelector('#link-btn-' + id);
+                if (oldLinkBtn) oldLinkBtn.remove();
+
+                // Add link button back if NOT deleted
+                if (!item._deleted && (item.source === 'drive_only' || item.source === 'shopify_only')) {
+                  var linkHtml = '<button id="link-btn-' + item.id + '" class="icon-btn' + (isSelected ? ' active' : '') + '" onclick="event.stopPropagation(); state.toggleSelection(\'' + item.id + '\')" title="Select for linking">🔗</button>';
+                  var viewBtn = overlay.querySelector('.btn-view');
+                  if (viewBtn) {
+                    viewBtn.insertAdjacentHTML('afterend', linkHtml);
+                  } else {
+                    overlay.insertAdjacentHTML('afterbegin', linkHtml);
+                  }
+                }
+
+                // Update Delete/Restore button
+                var actionBtn = overlay.querySelector('.btn-delete') || overlay.querySelector('[title="Restore"]');
+                if (actionBtn) {
+                  if (item._deleted) {
+                    actionBtn.className = 'icon-btn';
+                    actionBtn.innerHTML = '↩️';
+                    actionBtn.title = 'Restore';
+                  } else {
+                    actionBtn.className = 'icon-btn btn-delete';
+                    actionBtn.innerHTML = '🗑️';
+                    actionBtn.title = 'Delete';
+                  }
+                }
+              }
+
+              // 4. Update global item count
+              var activeCount = state.items.filter(function (i) { return !i._deleted; }).length;
+              var countEl = document.getElementById('item-count');
+              if (countEl) countEl.innerText = '(' + activeCount + ')';
+            };
+
     UI.prototype.openPreview = function (id) {
       var item = state.items.find(function (i) { return i.id === id; });
       if (!item) return;
@@ -1446,11 +1536,12 @@
             if (media) {
               ui.logStatus('fetch', 'Fetched full media state.', 'success');
               const normalized = media.map(function (i) {
+                var source = i.source || (i.shopifyId && i.driveId ? 'synced' : (i.shopifyId ? 'shopify_only' : 'drive_only'));
                 return {
                   ...i,
                   id: i.id || Math.random().toString(36).substr(2, 9),
-                  status: i.source || 'drive_only',
-                  source: i.source,
+                  status: source,
+                  source: source,
                   _deleted: false
                 };
               });
@@ -1862,7 +1953,7 @@
 
       startMatching() {
         document.getElementById('loading-ui').style.display = 'none';
-        document.getElementById('main-ui').style.display = 'none';
+        document.getElementById('main-ui').style.display = 'block';
         document.getElementById('matching-modal').style.display = 'flex';
         this.renderMatch();
       },
@@ -1980,8 +2071,12 @@
 
         // All Done
         document.getElementById('matching-modal').style.display = 'none';
-        ui.logStatus('info', 'Matching complete. Reloading...', 'info');
-        document.getElementById('loading-ui').style.display = 'block';
+        ui.logStatus('info', 'Matching complete. Finalizing gallery...', 'info');
+
+        // Show main UI immediately if not already showing
+        document.getElementById('main-ui').style.display = 'block';
+        document.getElementById('loading-ui').style.display = 'none';
+
         // Reload to get fresh state. Since hasRunMatching is true, it shouldn't trigger again.
         this.loadMedia(true);
       },