fix: Improve History panel performance and fix type duplications

- Remove duplicate GlobalStats interface from types (was causing conflicts)
- Only track scroll position when on Files tab (prevent unnecessary updates)
- Memoize activeSession to reduce re-render cascades
- Wrap HistoryPanel in React.memo to prevent unnecessary re-renders

src/renderer/App.tsx

@@ -782,7 +782,10 @@ export default function MaestroConsole() {
 
   // Keyboard navigation state
   const [selectedSidebarIndex, setSelectedSidebarIndex] = useState(0);
-  const activeSession = sessions.find(s => s.id === activeSessionId) || sessions[0] || null;
+  const activeSession = useMemo(() =>
+    sessions.find(s => s.id === activeSessionId) || sessions[0] || null,
+    [sessions, activeSessionId]
+  );
   const theme = THEMES[activeThemeId];
   const anyTunnelActive = sessions.some(s => s.tunnelActive);
 

src/renderer/components/HistoryPanel.tsx

@@ -13,7 +13,7 @@ export interface HistoryPanelHandle {
   focus: () => void;
 }
 
-export const HistoryPanel = forwardRef<HistoryPanelHandle, HistoryPanelProps>(function HistoryPanel({ session, theme, onJumpToClaudeSession }, ref) {
+export const HistoryPanel = React.memo(forwardRef<HistoryPanelHandle, HistoryPanelProps>(function HistoryPanel({ session, theme, onJumpToClaudeSession }, ref) {
   const [historyEntries, setHistoryEntries] = useState<HistoryEntry[]>([]);
   const [activeFilters, setActiveFilters] = useState<Set<HistoryEntryType>>(new Set(['AUTO', 'USER']));
   const [isLoading, setIsLoading] = useState(true);
@@ -392,4 +392,4 @@ export const HistoryPanel = forwardRef<HistoryPanelHandle, HistoryPanelProps>(fu
       )}
     </div>
   );
-});
+}));

src/renderer/components/RightPanel.tsx

@@ -164,10 +164,13 @@ export function RightPanel(props: RightPanelProps) {
           }
         }}
         onScroll={(e) => {
-          const scrollTop = e.currentTarget.scrollTop;
-          setSessions(prev => prev.map(s =>
-            s.id === session.id ? { ...s, fileExplorerScrollPos: scrollTop } : s
-          ));
+          // Only track scroll position for file explorer tab
+          if (activeRightTab === 'files') {
+            const scrollTop = e.currentTarget.scrollTop;
+            setSessions(prev => prev.map(s =>
+              s.id === session.id ? { ...s, fileExplorerScrollPos: scrollTop } : s
+            ));
+          }
         }}
       >
         {activeRightTab === 'files' && (

src/renderer/types/index.ts

@@ -216,15 +216,3 @@ export interface CustomAICommand {
   isBuiltIn?: boolean; // If true, cannot be deleted (only edited)
 }
 
-// Persistent global stats that survive app restarts
-export interface GlobalStats {
-  totalSessions: number;
-  totalMessages: number;
-  totalInputTokens: number;
-  totalOutputTokens: number;
-  totalCacheReadTokens: number;
-  totalCacheCreationTokens: number;
-  totalCostUsd: number;
-  totalActiveTimeMs: number;
-  lastUpdated: number; // Timestamp for tracking when stats were last updated
-}