fix: improve spacebar shortcut to ignore buttons

Updated spacebar handler to skip when focus is on:
- Input fields
- Textareas
- Buttons (HTMLButtonElement)
- Elements with role="button"

This prevents spacebar from triggering play/pause when clicking
playback control buttons or other UI controls.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

components/editor/AudioEditor.tsx

@@ -99,8 +99,18 @@ export function AudioEditor() {
   // Keyboard shortcuts
   React.useEffect(() => {
     const handleKeyDown = (e: KeyboardEvent) => {
-      // Spacebar for play/pause - only if not typing in an input
-      if (e.code === 'Space' && !(e.target instanceof HTMLInputElement || e.target instanceof HTMLTextAreaElement)) {
+      // Spacebar for play/pause - only if not interacting with form elements
+      if (e.code === 'Space') {
+        const target = e.target as HTMLElement;
+        // Don't trigger if user is typing or interacting with buttons/form elements
+        if (
+          target instanceof HTMLInputElement ||
+          target instanceof HTMLTextAreaElement ||
+          target instanceof HTMLButtonElement ||
+          target.getAttribute('role') === 'button'
+        ) {
+          return;
+        }
         e.preventDefault();
         togglePlayPause();
       }