fix: improve doc link navigation and tree display

- Fix link resolution with proper relative/absolute path handling
- Improve link styling with underline decoration
- Hide leaf nodes from tree, only show directories
- Fix log file path for packaged app

electron/main.mjs

@@ -7,7 +7,9 @@ const __filename = fileURLToPath(import.meta.url);
 const __dirname = path.dirname(__filename);
 
 let mainWindow = null;
-const LOG_FILE = path.join(__dirname, '..', 'electron.log');
+const LOG_FILE = app.isPackaged 
+  ? path.join(app.getPath('userData'), 'electron.log')
+  : path.join(__dirname, '..', 'electron.log');
 
 function log(...args) {
   const msg = args.map(a => typeof a === 'object' ? JSON.stringify(a) : String(a)).join(' ');