feat: add auto-zoom to filtered search results

Implements automatic viewport adjustment to focus on filtered nodes when
search or filter criteria change, providing immediate visual feedback.

Features:
- Auto-zoom triggers when search text or type filters are applied
- 300ms debouncing prevents excessive zooming while typing
- Only zooms when some (but not all) nodes match filters
- Smooth 300ms animation with 20% padding and 2.5x max zoom
- Toggle control via compact icon button in search header
- Enabled by default, persists user preference in search store

UI Changes:
- Added CenterFocusStrong icon toggle in LeftPanel search header
- Icon is blue when enabled, gray when disabled
- Tooltip shows current state
- Positioned after "Reset filters" button

Implementation:
- Search store tracks autoZoomEnabled state
- GraphEditor monitors filter changes and calculates matching nodes
- Uses React Flow's fitView() with smart node filtering
- Skips zoom when disabled, no nodes, or no active filters

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

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

src/components/Editor/GraphEditor.tsx

@@ -24,6 +24,7 @@ import "reactflow/dist/style.css";
 import { useGraphWithHistory } from "../../hooks/useGraphWithHistory";
 import { useDocumentHistory } from "../../hooks/useDocumentHistory";
 import { useEditorStore } from "../../stores/editorStore";
+import { useSearchStore } from "../../stores/searchStore";
 import { useActiveDocument } from "../../stores/workspace/useActiveDocument";
 import { useWorkspaceStore } from "../../stores/workspaceStore";
 import { useCreateDocument } from "../../hooks/useCreateDocument";
@@ -99,8 +100,17 @@ const GraphEditor = ({ onNodeSelect, onEdgeSelect, onAddNodeRequest, onExportReq
     screenToFlowPosition,
     setViewport,
     getViewport: getCurrentViewport,
+    fitView,
   } = useReactFlow();
 
+  // Search and filter state for auto-zoom
+  const {
+    searchText,
+    visibleActorTypes,
+    visibleRelationTypes,
+    autoZoomEnabled,
+  } = useSearchStore();
+
   // Track previous document ID to save viewport before switching
   const prevDocumentIdRef = useRef<string | null>(null);
 
@@ -237,6 +247,83 @@ const GraphEditor = ({ onNodeSelect, onEdgeSelect, onAddNodeRequest, onExportReq
     return () => window.removeEventListener('closeAllMenus', handleCloseAllMenus);
   }, []);
 
+  // Auto-zoom to filtered results when search/filter changes
+  useEffect(() => {
+    // Skip if auto-zoom is disabled
+    if (!autoZoomEnabled) return;
+
+    // Skip if there are no nodes
+    if (nodes.length === 0) return;
+
+    // Check if any filters are active
+    const hasSearchText = searchText.trim() !== '';
+    const hasTypeFilters =
+      Object.values(visibleActorTypes).some(v => v === false) ||
+      Object.values(visibleRelationTypes).some(v => v === false);
+
+    // Skip if no filters are active
+    if (!hasSearchText && !hasTypeFilters) return;
+
+    // Debounce to avoid excessive viewport changes while typing
+    const timeoutId = setTimeout(() => {
+      const searchLower = searchText.toLowerCase().trim();
+
+      // Calculate matching nodes (same logic as LeftPanel and CustomNode)
+      const matchingNodeIds = nodes
+        .filter((node) => {
+          const actor = node as Actor;
+          const actorType = actor.data?.type || '';
+
+          // Filter by actor type visibility
+          const isTypeVisible = visibleActorTypes[actorType] !== false;
+          if (!isTypeVisible) {
+            return false;
+          }
+
+          // Filter by search text
+          if (searchLower) {
+            const label = actor.data?.label?.toLowerCase() || '';
+            const description = actor.data?.description?.toLowerCase() || '';
+            const nodeTypeConfig = nodeTypeConfigs.find((nt) => nt.id === actorType);
+            const typeName = nodeTypeConfig?.label?.toLowerCase() || '';
+
+            const matches =
+              label.includes(searchLower) ||
+              description.includes(searchLower) ||
+              typeName.includes(searchLower);
+
+            if (!matches) {
+              return false;
+            }
+          }
+
+          return true;
+        })
+        .map((node) => node.id);
+
+      // Only zoom if there are matching nodes and not all nodes match
+      if (matchingNodeIds.length > 0 && matchingNodeIds.length < nodes.length) {
+        fitView({
+          nodes: matchingNodeIds.map((id) => ({ id })),
+          padding: 0.2,      // 20% padding around selection
+          duration: 300,     // 300ms smooth animation
+          maxZoom: 2.5,      // Allow more zoom in
+          minZoom: 0.5,      // Don't zoom out too much
+        });
+      }
+    }, 300); // Debounce 300ms
+
+    return () => clearTimeout(timeoutId);
+  }, [
+    searchText,
+    visibleActorTypes,
+    visibleRelationTypes,
+    autoZoomEnabled,
+    nodes,
+    nodeTypeConfigs,
+    fitView,
+  ]);
+
   // Save viewport periodically (debounced)
   const handleViewportChange = useCallback(
     (_event: MouseEvent | TouchEvent | null, viewport: Viewport) => {

src/components/Panels/LeftPanel.tsx

@@ -8,6 +8,7 @@ import SettingsIcon from '@mui/icons-material/Settings';
 import SearchIcon from '@mui/icons-material/Search';
 import ClearIcon from '@mui/icons-material/Clear';
 import FilterAltOffIcon from '@mui/icons-material/FilterAltOff';
+import CenterFocusStrongIcon from '@mui/icons-material/CenterFocusStrong';
 import { usePanelStore } from '../../stores/panelStore';
 import { useGraphWithHistory } from '../../hooks/useGraphWithHistory';
 import { useEditorStore } from '../../stores/editorStore';
@@ -86,6 +87,8 @@ const LeftPanel = forwardRef<LeftPanelRef, LeftPanelProps>(({ onDeselectAll, onA
     setActorTypeVisible,
     visibleRelationTypes,
     setRelationTypeVisible,
+    autoZoomEnabled,
+    setAutoZoomEnabled,
     clearFilters,
     hasActiveFilters,
   } = useSearchStore();
@@ -401,6 +404,7 @@ const LeftPanel = forwardRef<LeftPanelRef, LeftPanelProps>(({ onDeselectAll, onA
                   <label className="block text-xs font-medium text-gray-600">
                     Search
                   </label>
+                  <div className="flex items-center space-x-1">
                     {/* Reset Filters Link */}
                     {hasActiveFilters() && (
                       <button
@@ -411,6 +415,22 @@ const LeftPanel = forwardRef<LeftPanelRef, LeftPanelProps>(({ onDeselectAll, onA
                         <span>Reset filters</span>
                       </button>
                     )}
+                    {/* Auto-zoom toggle icon */}
+                    <Tooltip title={autoZoomEnabled ? "Auto-zoom enabled" : "Auto-zoom disabled"} placement="top">
+                      <IconButton
+                        size="small"
+                        onClick={() => setAutoZoomEnabled(!autoZoomEnabled)}
+                        sx={{ padding: '4px' }}
+                      >
+                        <CenterFocusStrongIcon
+                          sx={{
+                            fontSize: 16,
+                            color: autoZoomEnabled ? '#3b82f6' : '#9ca3af'
+                          }}
+                        />
+                      </IconButton>
+                    </Tooltip>
+                  </div>
                 </div>
                 <div className="relative">
                   <div className="absolute left-2.5 top-1/2 transform -translate-y-1/2 pointer-events-none">

src/stores/searchStore.ts

@@ -7,6 +7,7 @@ import { create } from 'zustand';
  * - Search text for filtering both actors (by label, description, or type) and relations (by label or type)
  * - Filter by actor types (show/hide specific node types)
  * - Filter by relation types (show/hide specific edge types)
+ * - Auto-zoom to filtered results (optional, enabled by default)
  * - Results tracking
  */
 
@@ -27,6 +28,10 @@ interface SearchStore {
   toggleRelationType: (typeId: string) => void;
   setAllRelationTypesVisible: (visible: boolean) => void;
 
+  // Auto-zoom to filtered results
+  autoZoomEnabled: boolean;
+  setAutoZoomEnabled: (enabled: boolean) => void;
+
   // Clear all filters
   clearFilters: () => void;
 
@@ -38,6 +43,7 @@ export const useSearchStore = create<SearchStore>((set, get) => ({
   searchText: '',
   visibleActorTypes: {},
   visibleRelationTypes: {},
+  autoZoomEnabled: true,
 
   setSearchText: (text: string) =>
     set({ searchText: text }),
@@ -92,6 +98,9 @@ export const useSearchStore = create<SearchStore>((set, get) => ({
       return { visibleRelationTypes: updated };
     }),
 
+  setAutoZoomEnabled: (enabled: boolean) =>
+    set({ autoZoomEnabled: enabled }),
+
   clearFilters: () =>
     set((state) => {
       // Reset all actor types to visible