feat: add navigation sidebar + Agents Console (v0.11.0)

Add react-router-dom with HashRouter, persistent Layout with sidebar
navigation (Dashboard + Agents), and Agents Console page with agent
tree view, model selector, and workspace file browser with edit/save.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

preload.js

@@ -4,7 +4,7 @@ const { contextBridge, ipcRenderer } = require('electron');
 
 contextBridge.exposeInMainWorld('odo', {
   platform: process.platform,
-  version: '0.10.1',
+  version: '0.11.0',
   isElectron: true,
 
   gateway: {