sync: contextual substrate UX from private repo

- Add DimensionIconsContext for app-wide dimension icon sharing
- Enhanced getNodeIcon() with favicon/YouTube/PDF detection + dimension icons
- Propagate dynamic icons to GridView, ListView, SearchModal, FocusPanel, ViewsOverlay, FolderViewOverlay
- Add RahEdge component with hover labels for map edges
- Update RahNode with dimension-colored borders and icon support
- Add MiniMap with dimension color coding to MapPane
- MCP server: add description field to rah_update_node, bump standalone to v1.4.2

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/components/views/GridView.tsx

@@ -1,7 +1,8 @@
 "use client";
 
 import { Node } from '@/types/database';
-import { File } from 'lucide-react';
+import { getNodeIcon } from '@/utils/nodeIcons';
+import { useDimensionIcons } from '@/context/DimensionIconsContext';
 
 interface GridViewProps {
   nodes: Node[];
@@ -9,6 +10,7 @@ interface GridViewProps {
 }
 
 export default function GridView({ nodes, onNodeClick }: GridViewProps) {
+  const { dimensionIcons } = useDimensionIcons();
   const truncateContent = (content?: string, maxLength: number = 120) => {
     if (!content) return '';
     if (content.length <= maxLength) return content;
@@ -85,7 +87,7 @@ export default function GridView({ nodes, onNodeClick }: GridViewProps) {
                   borderRadius: '6px',
                   flexShrink: 0
                 }}>
-                  <File size={14} color="#666" />
+                  {getNodeIcon(node, dimensionIcons, 14)}
                 </div>
                 <div style={{
                   fontSize: '13px',

src/components/views/ListView.tsx

@@ -1,7 +1,8 @@
 "use client";
 
 import { Node } from '@/types/database';
-import { File } from 'lucide-react';
+import { getNodeIcon } from '@/utils/nodeIcons';
+import { useDimensionIcons } from '@/context/DimensionIconsContext';
 
 interface ListViewProps {
   nodes: Node[];
@@ -9,6 +10,7 @@ interface ListViewProps {
 }
 
 export default function ListView({ nodes, onNodeClick }: ListViewProps) {
+  const { dimensionIcons } = useDimensionIcons();
   const formatDate = (dateString?: string) => {
     if (!dateString) return '';
     const date = new Date(dateString);
@@ -84,7 +86,7 @@ export default function ListView({ nodes, onNodeClick }: ListViewProps) {
               borderRadius: '6px',
               flexShrink: 0
             }}>
-              <File size={16} color="#666" />
+              {getNodeIcon(node, dimensionIcons, 16)}
             </div>
 
             {/* Content */}

src/components/views/ViewsOverlay.tsx

@@ -5,6 +5,7 @@ import { Plus, Trash2, LayoutGrid, List, Columns3, Save, Filter, ChevronDown, X
 import type { Node } from '@/types/database';
 import InputDialog from '../common/InputDialog';
 import { getNodeIcon } from '@/utils/nodeIcons';
+import { useDimensionIcons } from '@/context/DimensionIconsContext';
 
 type ViewMode = 'grid' | 'list' | 'kanban';
 
@@ -39,6 +40,7 @@ interface ViewsOverlayProps {
 }
 
 export default function ViewsOverlay({ onNodeClick, onNodeOpenInOtherPane, refreshToken = 0 }: ViewsOverlayProps) {
+  const { dimensionIcons } = useDimensionIcons();
   // Dimensions for filter picker
   const [dimensions, setDimensions] = useState<DimensionSummary[]>([]);
   const [dimensionsLoading, setDimensionsLoading] = useState(true);
@@ -401,7 +403,7 @@ export default function ViewsOverlay({ onNodeClick, onNodeOpenInOtherPane, refre
 
   // Render node card
   const renderNodeCard = (node: Node, columnId?: string, dimension?: string) => {
-    const nodeIcon = getNodeIcon(node);
+    const nodeIcon = getNodeIcon(node, dimensionIcons);
 
     return (
       <div