Add explicit return types to fix linting warnings

Add void return types to event handlers and cleanup functions in touch control components

Author: sam-mfb

src/game/mobile/TouchButtons.tsx

@@ -17,25 +17,25 @@ export const TouchButtons: React.FC<TouchButtonsProps> = ({
   const [firePressed, setFirePressed] = React.useState(false)
   const [shieldPressed, setShieldPressed] = React.useState(false)
 
-  const handleFireStart = (e: React.TouchEvent | React.MouseEvent) => {
+  const handleFireStart = (e: React.TouchEvent | React.MouseEvent): void => {
     e.preventDefault()
     setFirePressed(true)
     onControlsChange({ fire: true, shield: shieldPressed })
   }
 
-  const handleFireEnd = (e: React.TouchEvent | React.MouseEvent) => {
+  const handleFireEnd = (e: React.TouchEvent | React.MouseEvent): void => {
     e.preventDefault()
     setFirePressed(false)
     onControlsChange({ fire: false, shield: shieldPressed })
   }
 
-  const handleShieldStart = (e: React.TouchEvent | React.MouseEvent) => {
+  const handleShieldStart = (e: React.TouchEvent | React.MouseEvent): void => {
     e.preventDefault()
     setShieldPressed(true)
     onControlsChange({ fire: firePressed, shield: true })
   }
 
-  const handleShieldEnd = (e: React.TouchEvent | React.MouseEvent) => {
+  const handleShieldEnd = (e: React.TouchEvent | React.MouseEvent): void => {
     e.preventDefault()
     setShieldPressed(false)
     onControlsChange({ fire: firePressed, shield: false })

src/game/mobile/TouchJoystick.tsx

@@ -80,7 +80,7 @@ export const TouchJoystick: React.FC<TouchJoystickProps> = ({
     })
 
     // Cleanup
-    return () => {
+    return (): void => {
       manager.destroy()
       managerRef.current = null
     }