feat: complete Console overhaul with global dashboard, inline project filters, and context-mode integration

- Redesign Console dashboard: 8 clickable stat cards (Projects, Sessions, Active, Memories, Extensions, Requirements, Specifications, Changes), Recent Specifications and Recent Memories cards
- Flatten sidebar navigation: single nav list with inline ProjectFilter dropdowns per view
- Add TopbarSpecs: active spec pills in top bar across all projects
- Add notification navigation with project switching and clear-all support
- Add session resume workflow: copy session ID, /resume deep-linking
- Memory cards: show linked session, click to navigate, remove clutter
- Cross-project APIs: /api/plans/active/all, /api/extensions?all=true
- Project list from project_roots table (filtered to real git repos)
- Update branding: Make Claude Code production-ready
- Add context-mode integration for token-optimized context management
- Update README, Docusaurus docs, and marketing site

BREAKING CHANGE: Console UI completely restructured — sidebar flattened, project selector removed from sidebar and replaced with per-view inline filters, dashboard cards redesigned, PlanStatus and GitStatus widgets removed

Author: maxritter

.gitignore

@@ -269,3 +269,4 @@ bun.lock
 # Kiro
 .kiro/
 .worktrees/
+.env*.local