fix: include breadcrumb data when selecting plants via search

- Add sectionCode to PlantSearch SearchResult
- handleSearchSelect now passes room/section to selectedPlant.breadcrumb
- This makes breadcrumb visible in plant info panel

frontend/src/components/facility3d/PlantSearch.tsx

@@ -8,6 +8,7 @@ interface SearchResult {
     label: string;
     sublabel: string;
     roomName: string;
+    sectionCode: string;
     position: {
         roomX: number;
         roomY: number;
@@ -51,6 +52,7 @@ export function PlantSearch({ floorData, onSelectResult, onHighlightResults }: P
                             label: pos.plant.tagNumber,
                             sublabel: `${pos.plant.strain || 'Unknown'} • ${pos.plant.stage || 'N/A'}`,
                             roomName: room.name,
+                            sectionCode: section.code || section.name,
                             position: {
                                 roomX: room.posX,
                                 roomY: room.posY,

frontend/src/pages/Facility3DViewerPage.tsx

@@ -196,7 +196,17 @@ export default function Facility3DViewerPage() {
         setBeaconPosition([x, y, z]);
         setHighlightedTags([result.label]);
         setDimMode(true);
-        setSelectedPlant({ ...result.plant, x, y, z });
+        // Include breadcrumb data from search result
+        setSelectedPlant({
+            ...result.plant,
+            x,
+            y,
+            z,
+            breadcrumb: {
+                room: result.roomName,
+                section: result.sectionCode,
+            },
+        });
     }, [floorData]);
 
     // Highlight handler for search typing