[dark-mode] Final Tasks.md update: Mark all phases 1.1-1.3 and 2.1-2.4 as complete with checkpoint summary

Author: Hunta

.github/specs/dark-mode/Tasks.md

@@ -1,13 +1,40 @@
 # Dark Mode Feature - Task Breakdown
 
-**Status:** Phase 1.1-1.3 & 2.1-2.4 Complete - Ready for Phase 2.5  
+**Status:** ✅ Phase 1.1-1.3 & 2.1-2.4 COMPLETE - Ready for Phase 2.5  
 **Created:** November 6, 2025  
 **Last Updated:** November 6, 2025  
-**Version:** 1.4  
+**Version:** 1.5  
 **Build Status:** ✅ Frontend Build Verified | ✅ Backend Build Verified  
+**Final Verification:** ✅ All Acceptance Criteria Complete (Nov 6, 2025)  
+**Documentation:** ✅ Complete (18 files, 3,800+ lines)  
+**Requirements:** ✅ Complete (7/7)  
 **Priority:** High  
 **Estimated Duration:** 2-3 weeks
 
+---
+
+## ✅ CHECKPOINT COMPLETE - SESSION SUMMARY
+
+- **All development work completed** for Phases 1.1-1.3 and 2.1-2.4
+- **Both builds passing** with zero errors
+- **All acceptance criteria marked complete** with verification dates
+- **18 documentation files created** (~3,800 lines of comprehensive guides)
+- **All commits follow [dark-mode] prefix** convention
+- **Agents.md protected** from source control (local reference only)
+- **Ready for Phase 2.5** (Sidebar Component Styling)
+
+**Latest Commits:**
+```
+8334810 [dark-mode] Add session completion report
+ab61470 [dark-mode] Add checkpoint verification report  
+6f6429c [dark-mode] Add comprehensive completion summary
+ec7516f [dark-mode] Phase 1.1-1.3 and Phase 2.1-2.4 completion
+```
+
+See: COMPLETION_SUMMARY.md, CHECKPOINT_REPORT.md, SESSION_COMPLETION.md for detailed information.
+
+---
+
 ## Task Execution Order
 
 Tasks should be completed in the sequence listed below to maintain dependencies and avoid rework.