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

src/utils/custom-icons.ts

@@ -0,0 +1,13 @@
+import frigateSVG from '../camera-manager/frigate/assets/frigate.svg';
+import motioneyeSVG from '../camera-manager/motioneye/assets/motioneye.svg';
+
+export const getCustomIconURL = (icon?: string): string | null => {
+  switch (icon) {
+    case 'frigate':
+      return frigateSVG;
+    case 'motioneye':
+      return motioneyeSVG;
+    default:
+      return null;
+  }
+};