diff --git a/gitnexus-web/src/components/FileTreePanel.tsx b/gitnexus-web/src/components/FileTreePanel.tsx
index 2007e54d4c..4f55f43be4 100644
--- a/gitnexus-web/src/components/FileTreePanel.tsx
+++ b/gitnexus-web/src/components/FileTreePanel.tsx
@@ -14,6 +14,9 @@ import {
   Variable,
   Hash,
   Target,
+  List,
+  AtSign,
+  Type,
 } from '@/lib/lucide-icons';
 import { useAppState } from '../hooks/useAppState';
 import { FILTERABLE_LABELS, NODE_COLORS, ALL_EDGE_TYPES, EDGE_INFO, type EdgeType } from '../lib/constants';
@@ -187,7 +190,11 @@ const getNodeTypeIcon = (label: NodeLabel) => {
     case 'Function': return Braces;
     case 'Method': return Braces;
     case 'Interface': return Hash;
+    case 'Enum': return List;
+    case 'Type': return Type;
+    case 'Decorator': return AtSign;
     case 'Import': return FileCode;
+    case 'Variable': return Variable;
     default: return Variable;
   }
 };
@@ -501,7 +508,7 @@ export const FileTreePanel = ({ onFocusNode }: FileTreePanelProps) => {
               Color Legend
             </h3>
             <div className="grid grid-cols-2 gap-2">
-              {(['Folder', 'File', 'Class', 'Function', 'Interface', 'Method'] as NodeLabel[]).map(label => (
+              {(['Folder', 'File', 'Class', 'Interface', 'Enum', 'Type', 'Function', 'Method', 'Variable', 'Decorator'] as NodeLabel[]).map(label => (
                 <div key={label} className="flex items-center gap-1.5">
                   <div
                     className="w-2.5 h-2.5 rounded-full"
diff --git a/gitnexus-web/src/lib/constants.ts b/gitnexus-web/src/lib/constants.ts
index 4e2c57afa5..351f9b4d39 100644
--- a/gitnexus-web/src/lib/constants.ts
+++ b/gitnexus-web/src/lib/constants.ts
@@ -112,15 +112,18 @@ export const DEFAULT_VISIBLE_LABELS: NodeLabel[] = [
   'Type',
 ];
 
-// All filterable labels
+// All filterable labels (in display order)
 export const FILTERABLE_LABELS: NodeLabel[] = [
   'Folder',
   'File',
   'Class',
+  'Interface',
+  'Enum',
+  'Type',
   'Function',
   'Method',
   'Variable',
-  'Interface',
+  'Decorator',
   'Import',
 ];
 
diff --git a/gitnexus-web/src/lib/lucide-icons.tsx b/gitnexus-web/src/lib/lucide-icons.tsx
index f19c7dbfa2..7ec9d4122a 100644
--- a/gitnexus-web/src/lib/lucide-icons.tsx
+++ b/gitnexus-web/src/lib/lucide-icons.tsx
@@ -10,6 +10,7 @@ export {
   AlertCircle,
   AlertTriangle,
   ArrowRight,
+  AtSign,
   Brain,
   Box,
   Braces,
@@ -39,6 +40,7 @@ export {
   Layers,
   Lightbulb,
   LightbulbOff,
+  List,
   Loader2,
   Maximize2,
   MousePointerClick,
@@ -63,6 +65,7 @@ export {
   Target,
   Terminal,
   Trash2,
+  Type,
   Upload,
   User,
   Variable,
diff --git a/gitnexus-web/test/unit/constants.test.ts b/gitnexus-web/test/unit/constants.test.ts
index c886dfdfd1..c649b5f9d4 100644
--- a/gitnexus-web/test/unit/constants.test.ts
+++ b/gitnexus-web/test/unit/constants.test.ts
@@ -59,6 +59,41 @@ describe('DEFAULT_VISIBLE_LABELS', () => {
   });
 });
 
+describe('FILTERABLE_LABELS', () => {
+  it('includes all newly added node types', () => {
+    expect(FILTERABLE_LABELS).toContain('Enum');
+    expect(FILTERABLE_LABELS).toContain('Type');
+    expect(FILTERABLE_LABELS).toContain('Decorator');
+    expect(FILTERABLE_LABELS).toContain('Variable');
+  });
+
+  it('every filterable label has a defined color in NODE_COLORS', () => {
+    for (const label of FILTERABLE_LABELS) {
+      expect(NODE_COLORS).toHaveProperty(label);
+      expect(NODE_COLORS[label as keyof typeof NODE_COLORS]).toMatch(/^#[0-9a-f]{6}$/i);
+    }
+  });
+
+  it('every filterable label has a defined size in NODE_SIZES', () => {
+    for (const label of FILTERABLE_LABELS) {
+      expect(NODE_SIZES).toHaveProperty(label);
+      expect(NODE_SIZES[label as keyof typeof NODE_SIZES]).toBeGreaterThan(0);
+    }
+  });
+
+  it('has no duplicate entries', () => {
+    const unique = new Set(FILTERABLE_LABELS);
+    expect(unique.size).toBe(FILTERABLE_LABELS.length);
+  });
+
+  it('is a subset of DEFAULT_VISIBLE_LABELS plus togglable labels', () => {
+    const allKnown = new Set(Object.keys(NODE_COLORS));
+    for (const label of FILTERABLE_LABELS) {
+      expect(allKnown.has(label)).toBe(true);
+    }
+  });
+});
+
 describe('edge types', () => {
   it('ALL_EDGE_TYPES contains all EDGE_INFO keys', () => {
     const edgeInfoKeys = Object.keys(EDGE_INFO).sort();
diff --git a/gitnexus-web/test/unit/filter-panel.test.ts b/gitnexus-web/test/unit/filter-panel.test.ts
new file mode 100644
index 0000000000..19d20fb020
--- /dev/null
+++ b/gitnexus-web/test/unit/filter-panel.test.ts
@@ -0,0 +1,81 @@
+import { describe, expect, it } from 'vitest';
+import { FILTERABLE_LABELS, NODE_COLORS } from '../../src/lib/constants';
+import type { NodeLabel } from '../../src/core/graph/types';
+import * as lucideIcons from '../../src/lib/lucide-icons';
+
+const LEGEND_LABELS: NodeLabel[] = [
+  'Folder', 'File', 'Class', 'Interface', 'Enum', 'Type',
+  'Function', 'Method', 'Variable', 'Decorator',
+];
+
+const ICON_MAP: Record<string, string> = {
+  Folder: 'Folder',
+  File: 'FileCode',
+  Class: 'Box',
+  Function: 'Braces',
+  Method: 'Braces',
+  Interface: 'Hash',
+  Enum: 'List',
+  Type: 'Type',
+  Decorator: 'AtSign',
+  Import: 'FileCode',
+  Variable: 'Variable',
+};
+
+describe('filter panel icon mappings', () => {
+  it('every filterable label has a mapped icon', () => {
+    for (const label of FILTERABLE_LABELS) {
+      expect(ICON_MAP).toHaveProperty(label);
+    }
+  });
+
+  it('every mapped icon is exported from lucide-icons', () => {
+    const exportedNames = new Set(Object.keys(lucideIcons));
+    const requiredIcons = new Set(Object.values(ICON_MAP));
+    for (const iconName of requiredIcons) {
+      expect(exportedNames.has(iconName), `${iconName} should be exported from lucide-icons`).toBe(true);
+    }
+  });
+
+  it('newly added node types have distinct icons', () => {
+    expect(ICON_MAP.Enum).toBe('List');
+    expect(ICON_MAP.Type).toBe('Type');
+    expect(ICON_MAP.Decorator).toBe('AtSign');
+  });
+});
+
+describe('color legend', () => {
+  it('includes all newly added node types', () => {
+    expect(LEGEND_LABELS).toContain('Enum');
+    expect(LEGEND_LABELS).toContain('Type');
+    expect(LEGEND_LABELS).toContain('Decorator');
+    expect(LEGEND_LABELS).toContain('Variable');
+  });
+
+  it('every legend label has a color defined', () => {
+    for (const label of LEGEND_LABELS) {
+      expect(NODE_COLORS).toHaveProperty(label);
+      expect(NODE_COLORS[label]).toMatch(/^#[0-9a-f]{6}$/i);
+    }
+  });
+
+  it('legend labels match the order used in FileTreePanel', () => {
+    const expected: NodeLabel[] = [
+      'Folder', 'File', 'Class', 'Interface', 'Enum', 'Type',
+      'Function', 'Method', 'Variable', 'Decorator',
+    ];
+    expect(LEGEND_LABELS).toEqual(expected);
+  });
+
+  it('legend labels are a subset of filterable labels plus Import', () => {
+    const filterableSet = new Set(FILTERABLE_LABELS);
+    for (const label of LEGEND_LABELS) {
+      expect(filterableSet.has(label), `${label} should be in FILTERABLE_LABELS`).toBe(true);
+    }
+  });
+
+  it('has no duplicate entries', () => {
+    const unique = new Set(LEGEND_LABELS);
+    expect(unique.size).toBe(LEGEND_LABELS.length);
+  });
+});