Fix duplicate '& input' property in TerminalModal TextField sx prop

Merged two duplicate '& input' style properties into a single object to resolve TypeScript error during build. The color property is now combined with fontFamily, fontSize, and padding in one declaration.

https://claude.ai/code/session_X6MVx

frontend/components/TerminalModal.tsx

@@ -255,6 +255,7 @@ export default function TerminalModal({
                 fontFamily: '"Ubuntu Mono", monospace',
                 fontSize: '14px',
                 padding: '8px 12px',
+                color: '#F8F8F2',
               },
               '& .MuiOutlinedInput-root': {
                 backgroundColor: '#1E1E1E',
@@ -268,9 +269,6 @@ export default function TerminalModal({
                   borderColor: '#8BE9FD',
                 },
               },
-              '& input': {
-                color: '#F8F8F2',
-              },
             }}
           />
           <Button