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

package.json

@@ -10,6 +10,7 @@
     "@codemirror/lang-html": "^6.4.9",
     "@codemirror/lang-javascript": "^6.2.4",
     "@codemirror/lang-json": "^6.0.2",
+    "@codemirror/lang-markdown": "^6.4.0",
     "@codemirror/lang-sql": "^6.10.0",
     "@codemirror/search": "^6.5.11",
     "@codemirror/state": "^6.5.2",
@@ -24,11 +25,16 @@
     "@uiw/react-codemirror": "^4.25.1",
     "codemirror": "^6.0.2",
     "diff-match-patch": "^1.0.5",
+    "dompurify": "^3.3.0",
+    "file-saver": "^2.0.5",
+    "highlight.js": "^11.11.1",
     "html2pdf.js": "^0.12.1",
     "js-beautify": "^1.15.4",
     "jspdf": "^3.0.3",
     "jspdf-autotable": "^5.0.2",
     "lucide-react": "^0.540.0",
+    "marked": "^16.4.1",
+    "marked-emoji": "^2.0.1",
     "papaparse": "^5.5.3",
     "react": "18.3.1",
     "react-diff-view": "^3.3.2",
@@ -39,6 +45,7 @@
     "react-snap": "^1.23.0",
     "reactflow": "^11.11.4",
     "serialize-javascript": "^6.0.0",
+    "turndown": "^7.2.1",
     "web-vitals": "^2.1.4"
   },
   "devDependencies": {