feat: add API optimizations, cache invalidation and comprehensive test suite

- Add abort controllers and request deduplication to composables
- Add entity type cache invalidation on create/update/delete flows
- Add 179 new tests (utilities, services, composables, components)
- Fix Vue runtime warnings in structure editors

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

vitest.config.ts

@@ -1,7 +1,11 @@
 import { defineConfig } from 'vitest/config'
 import { resolve } from 'node:path'
+import vue from '@vitejs/plugin-vue'
+
+const iconStub = resolve(__dirname, 'tests/__mocks__/iconStub.ts')
 
 export default defineConfig({
+  plugins: [vue()],
   test: {
     globals: true,
     environment: 'happy-dom',
@@ -9,9 +13,10 @@ export default defineConfig({
     include: ['tests/**/*.test.ts'],
   },
   resolve: {
-    alias: {
-      '~': resolve(__dirname, 'app'),
-      '#imports': resolve(__dirname, 'tests/__mocks__/imports.ts'),
-    },
+    alias: [
+      { find: /^~icons\/.*/, replacement: iconStub },
+      { find: '~', replacement: resolve(__dirname, 'app') },
+      { find: '#imports', replacement: resolve(__dirname, 'tests/__mocks__/imports.ts') },
+    ],
   },
 })