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

PROJECT_ROADMAP.md

@@ -1,6 +1,6 @@
 # Developer Tools - Project Roadmap
 
-**Last Updated:** October 14, 2025
+**Last Updated:** October 22, 2025
 
 ---
 
@@ -16,10 +16,16 @@ Build a comprehensive suite of developer tools with a focus on:
 
 ## 📊 Current Status
 
-### ✅ Completed Tools
-- **Object Editor** - JSON/PHP serialized data editor
-- **Table Editor** - Tabular data editor with multi-format support
+### ✅ Completed Tools (8 Active Tools)
+- **Markdown Editor** - Write & preview markdown with live rendering ✨ NEW
+- **Object Editor** - JSON/PHP serialized data editor (merged JSON & Serialize tools)
+- **Table Editor** - Tabular data editor with multi-format support (merged CSV-JSON)
 - **Invoice Editor** - Professional invoice generator
+- **URL Encoder/Decoder** - Encode/decode URLs
+- **Base64 Encoder/Decoder** - Base64 conversion
+- **Code Beautifier** - Format & minify code
+- **Diff Tool** - Compare text differences
+- **Text Length Checker** - Text statistics
 
 ### ✅ Completed Infrastructure
 - Consistent input patterns (Create/URL/Paste/Open)
@@ -27,6 +33,9 @@ Build a comprehensive suite of developer tools with a focus on:
 - Data loss prevention (confirmation modals)
 - Dark mode support
 - Responsive design
+- SEO optimization (FAQ schema, breadcrumbs, internal linking)
+- Related tools recommendations
+- Custom 404 page
 - Documentation (EDITOR_TOOL_GUIDE.md, EDITOR_CHECKLIST.md)
 
 ---
@@ -36,7 +45,7 @@ Build a comprehensive suite of developer tools with a focus on:
 ### Phase 1: Foundation & Monetization (Current - Week 1-2)
 
 #### Priority 1: Advanced URL Fetch ⭐
-**Status:** Planned  
+**Status:** ✅ Completed (Hidden for PRO tier)  
 **Timeline:** 1-2 days  
 **Impact:** HIGH - Benefits all existing and future tools
 
@@ -68,7 +77,7 @@ Build a comprehensive suite of developer tools with a focus on:
 ---
 
 #### Priority 2: Ad Space Preparation 💰
-**Status:** Planned  
+**Status:** ✅ Completed (Placeholder ads ready)  
 **Timeline:** 1 day  
 **Impact:** HIGH - Start monetization immediately
 
@@ -100,9 +109,9 @@ Build a comprehensive suite of developer tools with a focus on:
 **Specifications:**
 - **Desktop:**
   - 300px fixed width right column
-  - Sticky scroll (ads stay visible)
+  - Fixed positioning (ads stay visible)
   - 3 ad blocks maximum
-  - Ad sizes: 300x250, 300x600
+  - Ad sizes: All 300x250 (Medium Rectangle) - Google AdSense policy compliant
   - Hide below 1200px viewport width
   - Main content: `calc(100% - 320px)`
 
@@ -123,7 +132,7 @@ Build a comprehensive suite of developer tools with a focus on:
 ---
 
 #### Priority 3: AdSense Integration 💵
-**Status:** Planned  
+**Status:** ⏳ In Progress (Awaiting approval)  
 **Timeline:** 1 day  
 **Impact:** HIGH - Start earning revenue
 
@@ -138,7 +147,7 @@ Build a comprehensive suite of developer tools with a focus on:
 **Ad Units Needed:**
 - Desktop Sidebar 1 (300x250)
 - Desktop Sidebar 2 (300x250)
-- Desktop Sidebar 3 (300x600)
+- Desktop Sidebar 3 (300x250)
 - Mobile Bottom Banner (320x50)
 
 **Compliance:**
@@ -152,7 +161,7 @@ Build a comprehensive suite of developer tools with a focus on:
 ### Phase 2: Content Expansion (Week 3-6)
 
 #### Markdown Editor 📝
-**Status:** Planned  
+**Status:** ✅ Completed (October 22, 2025)  
 **Timeline:** 1-2 weeks  
 **Impact:** HIGH - Major new feature, attracts new users