refactor: improve main manu option (#170)

* chore: resolve eslint error

Signed-off-by: ysknsid25 <kengo071225@gmail.com>

* refactor: improve menu value handing

Signed-off-by: ysknsid25 <kengo071225@gmail.com>

* refactor: keep minimal typed main-menu options

Co-authored-by: Kanon <kengo071225@gmail.com>

* refactor: minimize typed menu diff against main

Co-authored-by: Kanon <kengo071225@gmail.com>

---------

Signed-off-by: ysknsid25 <kengo071225@gmail.com>
Co-authored-by: Matthew Breedlove <sirmalloc@gmail.com>

src/tui/App.tsx

@@ -52,7 +52,8 @@ import {
     PowerlineSetup,
     StatusLinePreview,
     TerminalOptionsMenu,
-    TerminalWidthMenu
+    TerminalWidthMenu,
+    type MainMenuOption
 } from './components';
 
 const GITHUB_REPO_URL = 'https://github.com/sirmalloc/ccstatusline';
@@ -206,7 +207,7 @@ export const App: React.FC = () => {
         }
     };
 
-    const handleMainMenuSelect = async (value: string) => {
+    const handleMainMenuSelect = async (value: MainMenuOption) => {
         switch (value) {
             case 'lines':
                 setScreen('lines');

src/tui/components/MainMenu.tsx

@@ -8,8 +8,18 @@ import React, { useState } from 'react';
 import type { Settings } from '../../types/Settings';
 import { type PowerlineFontStatus } from '../../utils/powerline';
 
+export type MainMenuOption = 'lines'
+    | 'colors'
+    | 'powerline'
+    | 'terminalConfig'
+    | 'globalOverrides'
+    | 'install'
+    | 'starGithub'
+    | 'save'
+    | 'exit';
+
 export interface MainMenuProps {
-    onSelect: (value: string) => void;
+    onSelect: (value: MainMenuOption) => void;
     isClaudeInstalled: boolean;
     hasChanges: boolean;
     initialSelection?: number;
@@ -59,7 +69,8 @@ export const MainMenu: React.FC<MainMenuProps> = ({ onSelect, isClaudeInstalled,
         } else if (key.return) {
             const item = selectableItems[selectedIndex];
             if (item) {
-                onSelect(item.value);
+                // Since we filtered by selectable: true, value is guaranteed to be MainMenuOption
+                onSelect(item.value as MainMenuOption);
             }
         }
     });