feat: UI improvements - buttons, monitor panel, system stats

- Redesign Run Claude button with purple gradient
- Redesign Run Shell button with dark green gradient
- Add + button to create new cases from toolbar
- Add Create Case modal for quick case creation
- Add Kill All modal with two options (tabs only vs full kill)
- Add CPU/Memory progress bars with color gradients
- Make monitor panel detachable as floating draggable window
- Monitor panel resizable when detached (min 350x250)
- Default CLAUDE.md template now uses /home/arkon/default/CLAUDE.md
- Streamline CLAUDE.md documentation

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/web/server.ts

@@ -936,11 +936,20 @@ export class WebServer extends EventEmitter {
   // Helper to get custom CLAUDE.md template path from settings
   private getDefaultClaudeMdPath(): string | undefined {
     const settingsPath = join(homedir(), '.claudeman', 'settings.json');
+    // Default template path (can be overridden in settings)
+    const defaultPath = '/home/arkon/default/CLAUDE.md';
+
     try {
       if (existsSync(settingsPath)) {
         const content = readFileSync(settingsPath, 'utf-8');
         const settings = JSON.parse(content);
-        return settings.defaultClaudeMdPath || undefined;
+        if (settings.defaultClaudeMdPath) {
+          return settings.defaultClaudeMdPath;
+        }
+      }
+      // Use default path if it exists
+      if (existsSync(defaultPath)) {
+        return defaultPath;
       }
     } catch (err) {
       console.error('Failed to read settings:', err);