feat: TASK-006 left panel redesign + task log updates

- Redesigned LeftPanel.tsx with 5 sections (ManaDisplay, Spire button, ActionButtons, AttunementStatus, ActivityLogPanel)
- Removed CalendarDisplay from left panel
- Created AttunementStatus component (attunement display with XP bars)
- Created ActivityLogPanel wrapper (last 20 events)
- Updated ActivityLog with configurable maxEntries prop
- Updated active-task-log.md (TASK-001/005/006 archived)

docs/project-structure.txt

@@ -13,7 +13,8 @@ Mana-Loop/
 │   └── custom.db
 ├── docs/
 │   ├── .workflow/
-│   │   └── TASK-001-playwright-setup.json
+│   │   ├── TASK-001-playwright-setup.json
+│   │   └── TASK-006-left-panel-redesign.json
 │   ├── strategy/
 │   │   └── overall-remediation-plan.md
 │   ├── tasks/