feat(app): Enter key confirms and sends dictation

When dictating and focused on an agent, pressing Enter now confirms
the dictation and sends the message, matching the behavior of clicking
the submit button.

packages/app/src/components/agent-input-area.tsx

@@ -74,6 +74,8 @@ interface AgentInputAreaProps {
   autoFocus?: boolean;
   /** Callback to expose the addImages function to parent components */
   onAddImages?: (addImages: (images: ImageAttachment[]) => void) => void;
+  /** Callback to expose a focus function to parent components (desktop only). */
+  onFocusInput?: (focus: () => void) => void;
   /** Optional draft context for listing commands before an agent exists. */
   commandDraftConfig?: DraftCommandConfig;
   /** Called when a message is about to be sent (any path: keyboard, dictation, queued). */
@@ -103,6 +105,7 @@ export function AgentInputArea({
   clearDraft,
   autoFocus = false,
   onAddImages,
+  onFocusInput,
   commandDraftConfig,
   onMessageSent,
   onComposerHeightChange,
@@ -208,6 +211,15 @@ export function AgentInputArea({
     onAddImages?.(addImages);
   }, [addImages, onAddImages]);
 
+  const focusInput = useCallback(() => {
+    if (Platform.OS !== "web") return;
+    messageInputRef.current?.focus();
+  }, []);
+
+  useEffect(() => {
+    onFocusInput?.(focusInput);
+  }, [focusInput, onFocusInput]);
+
   const submitMessage = useCallback(
     async (text: string, images?: ImageAttachment[]) => {
       onMessageSent?.();
@@ -402,6 +414,10 @@ export function AgentInputArea({
       }
 
       switch (action.id) {
+        case "message-input.send":
+          return messageInputRef.current?.runKeyboardAction("send") ?? false;
+        case "message-input.dictation-confirm":
+          return messageInputRef.current?.runKeyboardAction("dictation-confirm") ?? false;
         case "message-input.focus":
           if (Platform.OS !== "web") {
             messageInputRef.current?.focus();
@@ -440,8 +456,10 @@ export function AgentInputArea({
     handlerId: keyboardHandlerIdRef.current,
     actions: [
       "message-input.focus",
+      "message-input.send",
       "message-input.dictation-toggle",
       "message-input.dictation-cancel",
+      "message-input.dictation-confirm",
       "message-input.voice-toggle",
       "message-input.voice-mute-toggle",
     ],