feat: major update - Markdown Editor, CodeMirror upgrades, SEO improvements, tool cleanup

- Added new Markdown Editor with live preview, GFM support, PDF/HTML/DOCX export
- Upgraded all paste fields to CodeMirror with syntax highlighting and expand/collapse
- Enhanced Object Editor with advanced URL fetching and preview mode
- Improved export views with syntax highlighting in Table/Object editors
- Implemented SEO improvements (FAQ schema, breadcrumbs, internal linking)
- Added Related Tools recommendations component
- Created custom 404 page with tool suggestions
- Consolidated tools: removed JSON, Serialize, CSV-JSON (merged into main editors)
- Updated documentation and cleaned up redundant files
- Updated release notes with user-centric improvements

public/sitemap.xml

@@ -6,7 +6,7 @@
   <!-- Homepage -->
   <url>
     <loc>https://dewe.dev/</loc>
-    <lastmod>2025-10-15</lastmod>
+    <lastmod>2025-10-22</lastmod>
     <changefreq>weekly</changefreq>
     <priority>1.0</priority>
   </url>
@@ -14,39 +14,45 @@
   <!-- Editor Tools (High Priority) -->
   <url>
     <loc>https://dewe.dev/object-editor</loc>
-    <lastmod>2025-10-15</lastmod>
+    <lastmod>2025-10-22</lastmod>
     <changefreq>monthly</changefreq>
     <priority>0.9</priority>
   </url>
   <url>
     <loc>https://dewe.dev/table-editor</loc>
-    <lastmod>2025-10-15</lastmod>
+    <lastmod>2025-10-22</lastmod>
     <changefreq>monthly</changefreq>
     <priority>0.9</priority>
   </url>
   <url>
     <loc>https://dewe.dev/invoice-editor</loc>
-    <lastmod>2025-10-15</lastmod>
+    <lastmod>2025-10-22</lastmod>
+    <changefreq>monthly</changefreq>
+    <priority>0.9</priority>
+  </url>
+  <url>
+    <loc>https://dewe.dev/markdown-editor</loc>
+    <lastmod>2025-10-22</lastmod>
     <changefreq>monthly</changefreq>
     <priority>0.9</priority>
   </url>
   
-  <!-- Converter Tools -->
+  <!-- Encoder Tools -->
   <url>
     <loc>https://dewe.dev/url</loc>
-    <lastmod>2025-10-15</lastmod>
+    <lastmod>2025-10-22</lastmod>
     <changefreq>monthly</changefreq>
     <priority>0.8</priority>
   </url>
   <url>
     <loc>https://dewe.dev/base64</loc>
-    <lastmod>2025-10-15</lastmod>
+    <lastmod>2025-10-22</lastmod>
     <changefreq>monthly</changefreq>
     <priority>0.8</priority>
   </url>
   <url>
     <loc>https://dewe.dev/beautifier</loc>
-    <lastmod>2025-10-15</lastmod>
+    <lastmod>2025-10-22</lastmod>
     <changefreq>monthly</changefreq>
     <priority>0.8</priority>
   </url>
@@ -54,13 +60,13 @@
   <!-- Utility Tools -->
   <url>
     <loc>https://dewe.dev/diff</loc>
-    <lastmod>2025-10-15</lastmod>
+    <lastmod>2025-10-22</lastmod>
     <changefreq>monthly</changefreq>
     <priority>0.8</priority>
   </url>
   <url>
     <loc>https://dewe.dev/text-length</loc>
-    <lastmod>2025-10-15</lastmod>
+    <lastmod>2025-10-22</lastmod>
     <changefreq>monthly</changefreq>
     <priority>0.8</priority>
   </url>
@@ -68,7 +74,13 @@
   <!-- Info Pages -->
   <url>
     <loc>https://dewe.dev/whats-new</loc>
-    <lastmod>2025-10-15</lastmod>
+    <lastmod>2025-10-22</lastmod>
+    <changefreq>weekly</changefreq>
+    <priority>0.7</priority>
+  </url>
+  <url>
+    <loc>https://dewe.dev/release-notes</loc>
+    <lastmod>2025-10-22</lastmod>
     <changefreq>weekly</changefreq>
     <priority>0.7</priority>
   </url>