fix: Rationalize custom icons to avoid duplication (#1639)

tests/utils/custom-icons.test.ts

@@ -0,0 +1,22 @@
+import { describe, expect, it } from 'vitest';
+import frigateSVG from '../../src/camera-manager/frigate/assets/frigate.svg';
+import motioneyeSVG from '../../src/camera-manager/motioneye/assets/motioneye.svg';
+import { getCustomIconURL } from '../../src/utils/custom-icons';
+
+describe('getCustomIconURL', () => {
+  it('should return frigate SVG for frigate icon', () => {
+    expect(getCustomIconURL('frigate')).toBe(frigateSVG);
+  });
+
+  it('should return motioneye SVG for motioneye icon', () => {
+    expect(getCustomIconURL('motioneye')).toBe(motioneyeSVG);
+  });
+
+  it('should return null for mdi icon', () => {
+    expect(getCustomIconURL('mdi:car')).toBeNull();
+  });
+
+  it('should return null for undefined icon', () => {
+    expect(getCustomIconURL()).toBeNull();
+  });
+});