Fix ESLint errors for successful deployment

- Fixed mixed operators in contentExtractor.js with proper parentheses
- Removed unused variables and imports across all components
- Fixed useCallback dependencies in ObjectEditor.js
- Corrected == to === comparisons in TableEditor.js
- Fixed undefined variable references
- Wrapped serializeToPhp in useCallback to resolve dependency warning
- Updated table column width styling from min-w to w for consistent layout

Build now passes successfully with only non-blocking warnings remaining.

src/utils/contentExtractor.js

@@ -173,7 +173,7 @@ export const detectArticleStructure = (doc) => {
   // Check meta tags for articles
   const metaTags = doc.querySelectorAll('meta[property^="og:"], meta[name^="article:"]');
   structure.hasMetaArticle = Array.from(metaTags).some(meta => 
-    meta.getAttribute('property') === 'og:type' && meta.getAttribute('content') === 'article' ||
+    (meta.getAttribute('property') === 'og:type' && meta.getAttribute('content') === 'article') ||
     meta.getAttribute('name')?.startsWith('article:')
   );
 
@@ -325,7 +325,7 @@ export const classifyContent = (structure, metrics, articleText) => {
 export const extractContentFromUrl = async (url) => {
   try {
     // Fetch content
-    const { html, url: finalUrl, contentType } = await fetchUrlContent(url);
+    const { html, url: finalUrl } = await fetchUrlContent(url);
     
     // Parse HTML
     const doc = parseHtml(html);