fix: resolve TypeScript linting errors in test files

- Fix unsafe return of any type in ScriptsGrid.test.tsx
- Fix unsafe argument type in scripts.test.ts
- Remove unused variable warning in scripts.test.ts
- All tests now pass TypeScript strict mode validation

src/app/_components/__tests__/ScriptsGrid.test.tsx

@@ -34,7 +34,7 @@ vi.mock('../ScriptDetailModal', () => ({
     isOpen ? (
       <div data-testid="script-detail-modal">
         <button onClick={onClose}>Close</button>
-        <button onClick={() => onInstallScript?.('/test/path', 'test-script')}>Install</button>
+        <button onClick={() => { onInstallScript?.('/test/path', 'test-script') }}>Install</button>
       </div>
     ) : null,
 }))

src/server/lib/__tests__/scripts.test.ts

@@ -169,7 +169,7 @@ describe('ScriptManager', () => {
         logo: 'test-logo.png',
         name: 'Test Script',
         description: 'A test script',
-      } as any)
+      } as { logo: string; name: string; description: string })
 
       const scripts = await scriptManager.getCtScripts()
 
@@ -280,7 +280,7 @@ describe('ScriptManager', () => {
       }
       mockSpawn.mockReturnValue(mockChildProcess as any)
 
-      const childProcess = await scriptManager.executeScript('/test/scripts/script.py')
+      await scriptManager.executeScript('/test/scripts/script.py')
 
       expect(mockSpawn).toHaveBeenCalledWith('python', ['/test/scripts/script.py'], {
         cwd: '/test/scripts',