feat: add spatial search — keyword search, highlight matches, dim non-matches

Issue #1170
Searches memory content, IDs, categories. Matches glow white,
non-matches dim to 10% opacity. clearSearch() restores original state.

nexus/components/spatial-memory.js

@@ -734,13 +734,86 @@ const SpatialMemory = (() => {
     });
   }
 
+
+  // ─── SPATIAL SEARCH (issue #1170) ────────────────────
+  let _searchOriginalState = {};  // memId -> { emissiveIntensity, opacity } for restore
+
+  function searchContent(query) {
+    if (!query || !query.trim()) return [];
+    const q = query.toLowerCase().trim();
+    const matches = [];
+
+    Object.values(_memoryObjects).forEach(obj => {
+      const d = obj.data;
+      const searchable = [
+        d.content || '',
+        d.id || '',
+        d.category || '',
+        d.source || '',
+        ...(d.connections || [])
+      ].join(' ').toLowerCase();
+
+      if (searchable.includes(q)) {
+        matches.push(d.id);
+      }
+    });
+
+    return matches;
+  }
+
+  function highlightSearchResults(matchIds) {
+    // Save original state and apply search highlighting
+    _searchOriginalState = {};
+    const matchSet = new Set(matchIds);
+
+    Object.entries(_memoryObjects).forEach(([id, obj]) => {
+      const mat = obj.mesh.material;
+      _searchOriginalState[id] = {
+        emissiveIntensity: mat.emissiveIntensity,
+        opacity: mat.opacity
+      };
+
+      if (matchSet.has(id)) {
+        // Match: bright white glow
+        mat.emissive.setHex(0xffffff);
+        mat.emissiveIntensity = 5.0;
+        mat.opacity = 1.0;
+      } else {
+        // Non-match: dim to 10% opacity
+        mat.opacity = 0.1;
+        mat.emissiveIntensity = 0.2;
+      }
+    });
+  }
+
+  function clearSearch() {
+    Object.entries(_memoryObjects).forEach(([id, obj]) => {
+      const mat = obj.mesh.material;
+      const saved = _searchOriginalState[id];
+      if (saved) {
+        // Restore original emissive color from region
+        const region = REGIONS[obj.region] || REGIONS.working;
+        mat.emissive.copy(region.color);
+        mat.emissiveIntensity = saved.emissiveIntensity;
+        mat.opacity = saved.opacity;
+      }
+    });
+    _searchOriginalState = {};
+  }
+
+  function getSearchMatchPosition(matchId) {
+    const obj = _memoryObjects[matchId];
+    return obj ? obj.mesh.position.clone() : null;
+  }
+
   return {
     init, placeMemory, removeMemory, update,
     getMemoryAtPosition, getRegionAtPosition, getMemoriesInRegion, getAllMemories,
     getCrystalMeshes, getMemoryFromMesh, highlightMemory, clearHighlight, getSelectedId,
     exportIndex, importIndex, exportToFile, importFromFile, searchNearby, REGIONS,
     saveToStorage, loadFromStorage, clearStorage,
-    runGravityLayout
+    runGravityLayout,
+    searchContent, highlightSearchResults, clearSearch, getSearchMatchPosition
   };
 })();