feat: Phase 5 BYOB foundation + Phase 3 GitHub integration

Phase 5 - BYOB Backend (TASK-007A/B):
- LocalSQL Adapter with full CloudStore API compatibility
- QueryBuilder translates Parse-style queries to SQL
- SchemaManager with PostgreSQL/Supabase export
- LocalBackendServer with REST endpoints
- BackendManager with IPC handlers for Electron
- In-memory fallback when better-sqlite3 unavailable

Phase 3 - GitHub Panel (GIT-004):
- Issues tab with list/detail views
- Pull Requests tab with list/detail views
- GitHub API client with OAuth support
- Repository info hook integration

Phase 3 - Editor UX Bugfixes (TASK-013):
- Legacy runtime detection banners
- Read-only enforcement for legacy projects
- Code editor modal close improvements
- Property panel stuck state fix
- Blockly node deletion and UI polish

Phase 11 - Cloud Functions Planning:
- Architecture documentation for workflow automation
- Execution history storage schema design
- Canvas overlay concept for debugging

Docs: Updated LEARNINGS.md and COMMON-ISSUES.md

dev-docs/tasks/phase-3-editor-ux-overhaul/PROGRESS.md

@@ -1,6 +1,6 @@
 # Phase 3: Editor UX Overhaul - Progress Tracker
 
-**Last Updated:** 2026-01-07  
+**Last Updated:** 2026-01-14  
 **Overall Status:** 🟡 In Progress
 
 ---
@@ -11,8 +11,8 @@
 | ------------ | ------- |
 | Total Tasks  | 9       |
 | Completed    | 3       |
-| In Progress  | 0       |
-| Not Started  | 6       |
+| In Progress  | 1       |
+| Not Started  | 5       |
 | **Progress** | **33%** |
 
 ---
@@ -24,7 +24,7 @@
 | TASK-001  | Dashboard UX Foundation | 🟢 Complete    | Tabbed navigation done                        |
 | TASK-001B | Launcher Fixes          | 🟢 Complete    | All 4 subtasks implemented                    |
 | TASK-002  | GitHub Integration      | 🟢 Complete    | OAuth + basic features done                   |
-| TASK-002B | GitHub Advanced         | 🔴 Not Started | Issues/PR panels planned                      |
+| TASK-002B | GitHub Advanced         | 🟡 In Progress | GIT-004A complete, 5 subtasks remaining       |
 | TASK-003  | Shared Component System | 🔴 Not Started | Prefab system refactor                        |
 | TASK-004  | AI Project Creation     | 🔴 Not Started | AI scaffolding feature                        |
 | TASK-005  | Deployment Automation   | 🔴 Not Started | Planning docs only, no implementation         |
@@ -43,12 +43,13 @@
 
 ## Recent Updates
 
-| Date       | Update                                                |
-| ---------- | ----------------------------------------------------- |
-| 2026-01-07 | Audit completed: corrected TASK-001B, TASK-005 status |
-| 2026-01-07 | Added TASK-006 and TASK-007 to tracking               |
-| 2026-01-07 | TASK-008 moved to Phase 6 (UBA)                       |
-| 2026-01-07 | TASK-000 moved to Phase 9 (Styles)                    |
+| Date       | Update                                                 |
+| ---------- | ------------------------------------------------------ |
+| 2026-01-14 | TASK-002B GIT-004A complete (GitHub Client Foundation) |
+| 2026-01-07 | Audit completed: corrected TASK-001B, TASK-005 status  |
+| 2026-01-07 | Added TASK-006 and TASK-007 to tracking                |
+| 2026-01-07 | TASK-008 moved to Phase 6 (UBA)                        |
+| 2026-01-07 | TASK-000 moved to Phase 9 (Styles)                     |
 
 ---