CUB-41: Add low stock indicators to filament UI

frontend/src/app/components/filament-table/filament-table.component.spec.ts

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+import { describe, it, expect } from 'vitest';
+import {
+  Filament,
+  StockLevel,
+  getRemainingPercent,
+  classifyStockLevel,
+} from '../../models/filament.model';
+
+/** Create a test filament with defaults — override specific fields */
+function createFilament(overrides: Partial<Filament> = {}): Filament {
+  return {
+    id: '00000000-0000-0000-0000-000000000001',
+    materialBaseId: '10000000-0000-0000-0000-000000000001',
+    materialBaseName: 'PLA',
+    materialFinishId: '20000000-0000-0000-0000-000000000001',
+    materialFinishName: 'Basic',
+    materialModifierId: null,
+    materialModifierName: null,
+    brand: 'Bambu Lab',
+    colorName: 'White',
+    colorHex: '#FFFFFF',
+    weightTotalGrams: 1000,
+    weightRemainingGrams: 750,
+    filamentDiameterMm: 1.75,
+    spoolSerial: 'SN-001',
+    purchasePrice: null,
+    purchaseDate: null,
+    isActive: true,
+    createdAt: '2026-01-01T00:00:00Z',
+    updatedAt: '2026-01-01T00:00:00Z',
+    qrCodeUrl: '',
+    ...overrides,
+  };
+}
+
+describe('getRemainingPercent', () => {
+  it('should return correct percentage', () => {
+    const filament = createFilament({ weightTotalGrams: 1000, weightRemainingGrams: 250 });
+    expect(getRemainingPercent(filament)).toBe(25);
+  });
+
+  it('should return 0 when total weight is 0', () => {
+    const filament = createFilament({ weightTotalGrams: 0, weightRemainingGrams: 0 });
+    expect(getRemainingPercent(filament)).toBe(0);
+  });
+
+  it('should cap at 100%', () => {
+    const filament = createFilament({ weightTotalGrams: 100, weightRemainingGrams: 200 });
+    expect(getRemainingPercent(filament)).toBe(100);
+  });
+
+  it('should floor at 0%', () => {
+    const filament = createFilament({ weightTotalGrams: 100, weightRemainingGrams: -10 });
+    expect(getRemainingPercent(filament)).toBe(0);
+  });
+});
+
+describe('classifyStockLevel', () => {
+  it('should classify as critical when ≤10%', () => {
+    const filament = createFilament({ weightTotalGrams: 1000, weightRemainingGrams: 50 });
+    expect(classifyStockLevel(filament)).toBe('critical');
+  });
+
+  it('should classify as critical at exactly 10%', () => {
+    const filament = createFilament({ weightTotalGrams: 1000, weightRemainingGrams: 100 });
+    expect(classifyStockLevel(filament)).toBe('critical');
+  });
+
+  it('should classify as low when ≤25%', () => {
+    const filament = createFilament({ weightTotalGrams: 1000, weightRemainingGrams: 200 });
+    expect(classifyStockLevel(filament)).toBe('low');
+  });
+
+  it('should classify as moderate when ≤50%', () => {
+    const filament = createFilament({ weightTotalGrams: 1000, weightRemainingGrams: 400 });
+    expect(classifyStockLevel(filament)).toBe('moderate');
+  });
+
+  it('should classify as healthy when >50%', () => {
+    const filament = createFilament({ weightTotalGrams: 1000, weightRemainingGrams: 750 });
+    expect(classifyStockLevel(filament)).toBe('healthy');
+  });
+
+  it('should classify 0 grams remaining as critical', () => {
+    const filament = createFilament({ weightTotalGrams: 1000, weightRemainingGrams: 0 });
+    expect(classifyStockLevel(filament)).toBe('critical');
+  });
+});