fix: remove unused variables and imports

- Remove unused hasThemeStyles variable in theme-manager.test.ts
- Remove unused file variable in upload-adapter.test.ts
- Remove unused resolvedUrl variable in upload-adapter.test.ts
- Remove unused imports (PLUGIN_REGISTRY, getGlobalPluginRegistry, FilterOptions)
  from vaadin-ckeditor.ts

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: jet-pang

src/main/resources/META-INF/frontend/vaadin-ckeditor/theme-manager.test.ts

@@ -178,12 +178,6 @@ describe('ThemeManager CSS variable injection', () => {
 
         manager.initialize('dark', callback);
 
-        // Check if style element was created
-        const styleElements = document.querySelectorAll('style');
-        const hasThemeStyles = Array.from(styleElements).some(
-            (el) => el.textContent?.includes('--ck-color')
-        );
-
         // Theme manager injects CSS variables for dark mode
         expect(callback).toHaveBeenCalledWith('dark');
 

src/main/resources/META-INF/frontend/vaadin-ckeditor/upload-adapter.test.ts

@@ -32,11 +32,6 @@ describe('UploadAdapterManager', () => {
 
     describe('file size validation', () => {
         it('should use default max file size of 10MB', () => {
-            // Create a mock file loader
-            const file = new File(['x'.repeat(5 * 1024 * 1024)], 'small.jpg', {
-                type: 'image/jpeg',
-            });
-
             // File under 10MB should be accepted (we test via MIME type validation first)
             expect(manager.isMimeTypeAllowed('image/jpeg')).toBe(true);
         });
@@ -130,7 +125,6 @@ describe('UploadAdapterManager', () => {
         it('should resolve pending upload with URL', () => {
             // Simulate a pending upload
             const uploadId = 'test-upload-1';
-            let resolvedUrl: string | undefined;
 
             // We need to mock the internal pending uploads map
             // This tests the public resolveUpload method

src/main/resources/META-INF/frontend/vaadin-ckeditor/vaadin-ckeditor.ts

@@ -13,11 +13,8 @@ import { UploadAdapterManager } from './upload-adapter';
 import { FallbackRenderer, type FallbackMode } from './fallback-renderer';
 import {
     PluginResolver,
-    PLUGIN_REGISTRY,
     registerCKEditorPlugin,
-    getGlobalPluginRegistry,
     type PluginConfig,
-    type FilterOptions,
 } from './plugin-resolver';
 
 // Import sticky toolbar CSS (extracted for maintainability)