refactor(tui): clean up unused code and consolidate input handling

- Remove unused imports (Text, execSync, writeFileSync, React)
- Move n/r/q key handlers from App.tsx to StartScreen component
- Mark unused onClose prop in HelpOverlay with underscore prefix
- Consolidate keyboard handling in components that display the controls

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

src/tui/App.tsx

@@ -24,8 +24,8 @@
  */
 
 import React, { useState, useEffect, useCallback } from 'react';
-import { Box, Text, useApp, useInput, useStdout } from 'ink';
+import { Box, useApp, useInput, useStdout } from 'ink';
-import { execSync, spawnSync } from 'child_process';
+import { spawnSync } from 'child_process';
 import { StartScreen } from './components/StartScreen.js';
 import { TabBar } from './components/TabBar.js';
 import { TerminalView } from './components/TerminalView.js';
@@ -118,21 +118,9 @@ export function App(): React.ReactElement {
       return;
     }
 
-    // Start screen specific inputs
+    // Start screen specific inputs - handled by StartScreen component
+    // Only number keys for quick session selection are handled here
     if (viewMode === 'start') {
-      if (input === 'q') {
-        exit();
-        return;
-      }
-      if (input === 'n') {
-        handleCreateSession();
-        return;
-      }
-      if (input === 'r') {
-        refreshSessions();
-        return;
-      }
-      // Number keys to select session
       const num = parseInt(input, 10);
       if (!isNaN(num) && num >= 1 && num <= sessions.length) {
         handleSelectSession(sessions[num - 1]);

src/tui/components/HelpOverlay.tsx

@@ -75,7 +75,7 @@ const SHORTCUT_GROUPS: ShortcutGroup[] = [
  * @param props.onClose - Callback invoked when overlay should close
  * @returns The help overlay element
  */
-export function HelpOverlay({ onClose }: HelpOverlayProps): React.ReactElement {
+export function HelpOverlay({ onClose: _onClose }: HelpOverlayProps): React.ReactElement {
   return (
     <Box flexDirection="column" padding={2}>
       {/* Header */}

src/tui/components/StartScreen.tsx

@@ -125,6 +125,24 @@ export function StartScreen({
       onDeleteSession(sessions[selectedIndex]);
       return;
     }
+
+    // 'n' to create new session
+    if (input === 'n') {
+      onCreateSession();
+      return;
+    }
+
+    // 'r' to refresh session list
+    if (input === 'r') {
+      onRefresh();
+      return;
+    }
+
+    // 'q' to quit
+    if (input === 'q') {
+      onExit();
+      return;
+    }
   });
 
   return (

src/tui/hooks/useSessionManager.ts

@@ -24,7 +24,7 @@
  */
 
 import { useState, useEffect, useCallback, useRef } from 'react';
-import { existsSync, readFileSync, writeFileSync, watchFile, unwatchFile, unlinkSync } from 'fs';
+import { existsSync, readFileSync, watchFile, unwatchFile, unlinkSync } from 'fs';
 import { homedir } from 'os';
 import { join } from 'path';
 import { execSync } from 'child_process';

src/tui/index.tsx

@@ -24,7 +24,6 @@
  * @see {@link ./hooks/useSessionManager.ts} for state management
  */
 
-import React from 'react';
 import { render } from 'ink';
 import { App } from './App.js';