added SpeechRecognition declarations and missing type packages

studio/frontend/src/features/chat/shared-composer.tsx

@@ -38,7 +38,6 @@ function fileToBase64DataURL(file: File): Promise<string> {
 }
 
 function useDictation(
-  textareaRef: React.RefObject<HTMLTextAreaElement | null>,
   setText: (value: string | ((prev: string) => string)) => void,
 ) {
   const [isDictating, setIsDictating] = useState(false);
@@ -188,7 +187,6 @@ export function SharedComposer({
   const fileInputRef = useRef<HTMLInputElement>(null);
 
   const { isDictating, start: startDictation, stop: stopDictation, supported: dictationSupported } = useDictation(
-    textareaRef,
     setText,
   );
 

studio/frontend/src/speech-recognition.d.ts

@@ -0,0 +1,49 @@
+/**
+ * Minimal Web Speech API (Speech Recognition) types for browsers that support it.
+ * Full types: @types/dom-speech-recognition
+ */
+interface SpeechRecognitionResultList {
+  readonly length: number;
+  item(index: number): SpeechRecognitionResult;
+  [index: number]: SpeechRecognitionResult;
+}
+
+interface SpeechRecognitionResult {
+  readonly length: number;
+  readonly isFinal: boolean;
+  item(index: number): SpeechRecognitionAlternative;
+  [index: number]: SpeechRecognitionAlternative;
+}
+
+interface SpeechRecognitionAlternative {
+  readonly transcript: string;
+  readonly confidence: number;
+}
+
+interface SpeechRecognitionEvent extends Event {
+  readonly resultIndex: number;
+  readonly results: SpeechRecognitionResultList;
+}
+
+interface SpeechRecognition extends EventTarget {
+  continuous: boolean;
+  interimResults: boolean;
+  lang: string;
+  onresult: ((event: SpeechRecognitionEvent) => void) | null;
+  onerror: ((event: Event) => void) | null;
+  onend: (() => void) | null;
+  start(): void;
+  stop(): void;
+  abort(): void;
+}
+
+interface SpeechRecognitionConstructor {
+  new (): SpeechRecognition;
+}
+
+interface Window {
+  SpeechRecognition?: SpeechRecognitionConstructor;
+  webkitSpeechRecognition?: SpeechRecognitionConstructor;
+}
+
+declare var SpeechRecognition: SpeechRecognitionConstructor | undefined;