feat(dashboard): unify icons with Lucide Icons library

- Introduce Lucide Icons via CDN for consistent SVG icons
- Replace emoji icons with Lucide SVG icons in sidebar navigation
- Fix Sessions/Explorer icon confusion (📁/📂 → history/folder-tree)
- Update top bar icons (logo, theme toggle, search, refresh)
- Update stats section icons with colored Lucide icons
- Add icon animations support (animate-spin for loading states)
- Update Explorer view with Lucide folder/file icons
- Support dark/light theme icon adaptation

Icon mapping:
- Explorer: folder-tree (was 📂)
- Sessions: history (was 📁)
- Overview: bar-chart-3
- Active: play-circle
- Archived: archive
- Lite Plan: file-edit
- Lite Fix: wrench
- MCP Servers: plug
- Hooks: webhook

ccw/src/templates/dashboard-js/state.js

@@ -35,3 +35,8 @@ const liteTaskDataStore = {};
 // Store task JSON data in a global map instead of inline script tags
 // Key: unique task ID, Value: raw task JSON data
 const taskJsonStore = {};
+
+// ========== Global Notification Queue ==========
+// Notification queue visible from any view
+let globalNotificationQueue = [];
+let isNotificationPanelVisible = false;