feat: widen LeftPanel to 680px when admin tab is active

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

client/src/ui/LeftPanel.ts

@@ -324,6 +324,8 @@ export class LeftPanel {
   expand(tab: 'stats' | 'events' | 'inventions' | 'resources' | 'log' | 'admin'): void {
     this.activeTab = tab;
     this.expanded = true;
+    const width = tab === 'admin' ? 680 : 340;
+    this.panel.style.width = `${width}px`;
     this.showContent(tab);
     this.updateTabs();
     this.container.style.transform = 'translateY(-50%) translateX(0)';
@@ -340,6 +342,7 @@ export class LeftPanel {
 
   collapse(): void {
     this.expanded = false;
+    this.panel.style.width = '340px';
     this.container.style.transform = 'translateY(-50%) translateX(-340px)';
     this.updateTabs();
     document.dispatchEvent(new CustomEvent('left-panel-closed'));