Refactor Dropdown Handlers and Update WordPress Integration

- Updated dropdown onChange handlers across multiple components to use direct value passing instead of event target value for improved clarity and consistency.
- Changed `url` to `site_url` in WordPress integration configuration for better semantic clarity.
- Enhanced Vite configuration to include `fast-deep-equal` for compatibility with `react-dnd`.
- Updated navigation paths in `SiteContentEditor` and `SiteList` for consistency with new routing structure.

frontend/src/pages/Sites/PostEditor.tsx

@@ -327,7 +327,7 @@ export default function PostEditor() {
                   <SelectDropdown
                     options={CONTENT_TYPES}
                     value={content.content_type}
-                    onChange={(e) => setContent({ ...content, content_type: e.target.value })}
+                    onChange={(value) => setContent({ ...content, content_type: value })}
                   />
                 </div>
 
@@ -336,7 +336,7 @@ export default function PostEditor() {
                   <SelectDropdown
                     options={STATUS_OPTIONS}
                     value={content.status}
-                    onChange={(e) => setContent({ ...content, status: e.target.value })}
+                    onChange={(value) => setContent({ ...content, status: value })}
                   />
                 </div>
               </div>