chore(lint): burn down remaining warnings to zero

src/frontends/tui/components/App.tsx

@@ -372,9 +372,10 @@ export function App({
             setStreamingContent(fullContent);
           }
           if (event.type === 'done' && event.usage) {
+            const usage = event.usage;
             setTokenUsage(prev => ({
-              inputTokens: prev.inputTokens + event.usage!.inputTokens,
-              outputTokens: prev.outputTokens + event.usage!.outputTokens,
+              inputTokens: prev.inputTokens + usage.inputTokens,
+              outputTokens: prev.outputTokens + usage.outputTokens,
             }));
           }
           if (event.type === 'error') {

src/frontends/tui/components/StatusBar.tsx

@@ -20,7 +20,7 @@ function formatTokens(n: number): string {
 }
 
 export const StatusBar = memo(function StatusBar({
-  sessionId,
+  sessionId: _sessionId,
   messageCount,
   model,
   tokenUsage,