FN-6301: preserve mobile chat composer native focus

Preserve native mobile composer focus so first taps open the keyboard and sends remain usable.

- Stop canceling unfocused mobile textarea touch starts in direct chat, room chat, and Quick Chat.
- Add regression coverage for iOS and Android native focus behavior across the affected composers.
- Add a patch changeset for the published Fusion package.

Files changed:
 .changeset/fn-6301-mobile-chat-composer.md         |  5 ++
 packages/dashboard/app/components/ChatView.tsx     | 16 ++---
 packages/dashboard/app/components/QuickChatFAB.tsx | 18 +----
 .../components/__tests__/ChatView.rooms.test.tsx   | 23 +++++--
 .../app/components/__tests__/ChatView.test.tsx     | 45 +++++++++++++
 .../app/components/__tests__/QuickChatFAB.test.tsx | 77 ++++++++++++++++++++++
 6 files changed, 153 insertions(+), 31 deletions(-)

Fusion-Task-Id: FN-6301

Fusion-Task-Lineage: 3bee944d-3b94-41a2-976e-c1e3221236ad

.changeset/fn-6301-mobile-chat-composer.md

@@ -0,0 +1,5 @@
+---
+"@runfusion/fusion": patch
+---
+
+Fix mobile chat composer first taps so iOS and Android preserve native keyboard focus across direct chat, room chat, and Quick Chat.

packages/dashboard/app/components/ChatView.tsx

@@ -2880,8 +2880,9 @@ export function ChatView({ projectId, addToast, experimentalFeatures }: ChatView
               if (window.innerWidth > 768) return;
               if (!isIOS()) return;
               if (document.activeElement === event.currentTarget) return;
-              event.preventDefault();
+              // FN-6301: do not preventDefault on the first unfocused iOS tap.
-              event.currentTarget.focus({ preventScroll: true });
+              // Native focus is the reliable path that raises the soft keyboard;
+              // the visualViewport/input-focus effects own scroll compensation.
             }}
             rows={1}
             data-testid="chat-input"
@@ -3420,16 +3421,11 @@ export function ChatView({ projectId, addToast, experimentalFeatures }: ChatView
                     onTouchStart={(event) => {
                       if (typeof window === "undefined") return;
                       if (window.innerWidth > 768) return;
-                      // iOS-only: preventDefault + programmatic focus avoids
-                      // iOS's visual-viewport scroll on re-focus. On Android,
-                      // preventDefault here blocks the soft keyboard from
-                      // opening at all (programmatic focus() does not raise
-                      // the keyboard on Android), so the input "focuses" but
-                      // the keyboard never appears.
                       if (!isIOS()) return;
                       if (document.activeElement === event.currentTarget) return;
-                      event.preventDefault();
+                      // FN-6301: do not preventDefault on the first unfocused iOS tap.
-                      event.currentTarget.focus({ preventScroll: true });
+                      // Native focus is the reliable path that raises the soft keyboard;
+                      // the visualViewport/input-focus effects own scroll compensation.
                     }}
                     rows={1}
                     data-testid="chat-input"

packages/dashboard/app/components/QuickChatFAB.tsx

@@ -3027,26 +3027,14 @@ export function QuickChatFAB({
                   onBlur={handleInputBlur}
                   onFocus={handleInputFocus}
                   onPaste={handlePaste}
-                  // Intercept the touch *before* iOS's default focus-and-
-                  // scroll handler runs. Without this, on the second focus
-                  // (after a keyboard dismiss) iOS shifts the visual
-                  // viewport to "scroll" the input into view, which yanks
-                  // the position:fixed panel up off-screen for ~1s before
-                  // settling back. preventDefault on touchstart suppresses
-                  // that auto-scroll; we then focus programmatically with
-                  // preventScroll so the keyboard still comes up.
                   onTouchStart={(event) => {
                     if (typeof window === "undefined") return;
                     if (window.innerWidth > QUICK_CHAT_DESKTOP_BREAKPOINT) return;
-                    // iOS-only workaround. On Android, preventDefault on
-                    // textarea touchstart prevents the soft keyboard from
-                    // opening at all (programmatic focus() does not raise
-                    // the keyboard on Android — only the default touch
-                    // action does), so the tap silently dismisses.
                     if (!isIOS()) return;
                     if (document.activeElement === event.currentTarget) return;
-                    event.preventDefault();
+                    // FN-6301: do not preventDefault on the first unfocused iOS tap.
-                    event.currentTarget.focus({ preventScroll: true });
+                    // Native focus is the reliable path that raises the soft keyboard;
+                    // the visualViewport/input-focus effects own scroll compensation.
                   }}
                   placeholder={inputPlaceholder}
                   disabled={inputDisabled}

packages/dashboard/app/components/__tests__/ChatView.rooms.test.tsx

@@ -11,6 +11,7 @@ import { _resetInitialViewportHeight } from "../../hooks/useMobileKeyboard";
 vi.mock("../../hooks/useChat");
 vi.mock("../../hooks/useMobileScrollLock", () => ({
   useMobileScrollLock: vi.fn(),
+  useMobileKeyboardViewportLock: vi.fn(),
   isIOS: () => true,
   _resetLockState: vi.fn(),
 }));
@@ -605,20 +606,30 @@ describe("ChatView — rooms (FN-3805..FN-3811 contract)", () => {
     await renderWithAct(<ChatView projectId="proj-123" addToast={vi.fn()} experimentalFeatures={{ chatRooms: true }} />);
 
     const roomInput = screen.getByTestId("chat-input") as HTMLTextAreaElement;
-    const roomFocusSpy = vi.spyOn(roomInput, "focus");
+    const roomTouchEvent = new TouchEvent("touchstart", { bubbles: true, cancelable: true });
+    const roomPreventDefaultSpy = vi.spyOn(roomTouchEvent, "preventDefault");
     await act(async () => {
-      fireEvent.touchStart(roomInput);
+      fireEvent(roomInput, roomTouchEvent);
+      if (!roomTouchEvent.defaultPrevented) {
+        roomInput.focus();
+      }
     });
-    expect(roomFocusSpy).toHaveBeenCalledWith({ preventScroll: true });
+    expect(roomPreventDefaultSpy).not.toHaveBeenCalled();
+    expect(document.activeElement).toBe(roomInput);
 
     await userEvent.click(screen.getByTestId("chat-sidebar-scope-direct"));
 
     const directInput = screen.getByTestId("chat-input") as HTMLTextAreaElement;
-    const directFocusSpy = vi.spyOn(directInput, "focus");
+    const directTouchEvent = new TouchEvent("touchstart", { bubbles: true, cancelable: true });
+    const directPreventDefaultSpy = vi.spyOn(directTouchEvent, "preventDefault");
     await act(async () => {
-      fireEvent.touchStart(directInput);
+      fireEvent(directInput, directTouchEvent);
+      if (!directTouchEvent.defaultPrevented) {
+        directInput.focus();
+      }
     });
-    expect(directFocusSpy).toHaveBeenCalledWith({ preventScroll: true });
+    expect(directPreventDefaultSpy).not.toHaveBeenCalled();
+    expect(document.activeElement).toBe(directInput);
 
     mediaSpy.mockRestore();
   });

packages/dashboard/app/components/__tests__/ChatView.test.tsx

@@ -22,6 +22,7 @@ import { _resetInitialViewportHeight } from "../../hooks/useMobileKeyboard";
 import { SWR_CACHE_KEYS, writeCache } from "../../utils/swrCache";
 import * as useChatRoomsModule from "../../hooks/useChatRooms";
 import type { UseChatRoomsResult } from "../../hooks/useChatRooms";
+import * as mobileScrollLock from "../../hooks/useMobileScrollLock";
 
 // Mock the hooks
 vi.mock("../../hooks/useChat");
@@ -3869,6 +3870,50 @@ describe("ChatView mobile behavior", () => {
     }
   });
 
+  it("mobile mode: iOS first tap focuses direct composer without blocking native focus, then sends", async () => {
+    const restoreMatchMedia = mockMobileViewport();
+    const isIOSSpy = vi.spyOn(mobileScrollLock, "isIOS").mockReturnValue(true);
+    const sendMessage = vi.fn();
+
+    try {
+      setupMockChat({
+        activeSession: activeSessionFixture,
+        messages: [],
+        sendMessage,
+      });
+
+      await renderWithAct(<ChatView projectId="proj-123" addToast={vi.fn()} />);
+
+      const input = screen.getByTestId("chat-input") as HTMLTextAreaElement;
+      input.blur();
+      expect(document.activeElement).not.toBe(input);
+
+      const touchEvent = new TouchEvent("touchstart", { bubbles: true, cancelable: true });
+      const preventDefaultSpy = vi.spyOn(touchEvent, "preventDefault");
+      fireEvent(input, touchEvent);
+      // jsdom has no soft keyboard/native touch-focus default action; mirror
+      // the browser focus that iOS only performs when touchstart is not canceled.
+      if (!touchEvent.defaultPrevented) {
+        input.focus();
+      }
+
+      expect(preventDefaultSpy).not.toHaveBeenCalled();
+      expect(document.activeElement).toBe(input);
+
+      fireEvent.change(input, { target: { value: "Hello mobile" } });
+      const sendButton = screen.getByTestId("chat-send-btn");
+      fireEvent.touchStart(sendButton);
+      fireEvent.click(sendButton);
+
+      expect(sendMessage).toHaveBeenCalledTimes(1);
+      expect(sendMessage).toHaveBeenCalledWith("Hello mobile", []);
+      expect(document.activeElement).toBe(input);
+    } finally {
+      isIOSSpy.mockRestore();
+      restoreMatchMedia.mockRestore();
+    }
+  });
+
   it("mobile mode: send button sends on first touch and keeps composer focused", async () => {
     const restoreMatchMedia = mockMobileViewport();
     const sendMessage = vi.fn();

packages/dashboard/app/components/__tests__/QuickChatFAB.test.tsx

@@ -9,6 +9,7 @@ import { useViewportMode } from "../../hooks/useViewportMode";
 import { useMobileKeyboard } from "../../hooks/useMobileKeyboard";
 import { useAppSettings } from "../../hooks/useAppSettings";
 import { useChatRooms } from "../../hooks/useChatRooms";
+import * as mobileScrollLock from "../../hooks/useMobileScrollLock";
 import { QuickChatFAB } from "../QuickChatFAB";
 import { FileBrowserProvider } from "../../context/FileBrowserContext";
 
@@ -799,6 +800,82 @@ describe("QuickChatFAB session-first UX", () => {
     expect(screen.getByTestId("quick-chat-session-option-session-model")).toBeInTheDocument();
   });
 
+  it("FN-6301: iOS first tap focuses composer without canceling native focus, then sends", async () => {
+    Object.defineProperty(window, "innerWidth", { configurable: true, value: 390 });
+    window.dispatchEvent(new Event("resize"));
+    mockUseViewportMode.mockReturnValue("mobile");
+    const isIOSSpy = vi.spyOn(mobileScrollLock, "isIOS").mockReturnValue(true);
+    mockStreamChatResponse.mockImplementation((_sessionId, _content, _handlers) => ({
+      close: vi.fn(),
+      isConnected: () => true,
+    }));
+
+    try {
+      render(<QuickChatFAB addToast={vi.fn()} projectId="proj-1" />);
+      fireEvent.click(screen.getByTestId("quick-chat-fab"));
+
+      const input = await screen.findByTestId("quick-chat-input") as HTMLTextAreaElement;
+      await waitFor(() => expect(input).not.toBeDisabled());
+      input.blur();
+      expect(document.activeElement).not.toBe(input);
+
+      const touchEvent = new TouchEvent("touchstart", { bubbles: true, cancelable: true });
+      const preventDefaultSpy = vi.spyOn(touchEvent, "preventDefault");
+      fireEvent(input, touchEvent);
+      // jsdom has no soft keyboard/native touch-focus default action; mirror
+      // the browser focus that iOS only performs when touchstart is not canceled.
+      if (!touchEvent.defaultPrevented) {
+        input.focus();
+      }
+
+      expect(preventDefaultSpy).not.toHaveBeenCalled();
+      expect(document.activeElement).toBe(input);
+      expect(screen.getByTestId("quick-chat-send")).toBeDisabled();
+
+      fireEvent.change(input, { target: { value: "Hello quick mobile" } });
+      const sendButton = screen.getByTestId("quick-chat-send");
+      fireEvent.touchStart(sendButton);
+      fireEvent.click(sendButton);
+
+      await waitFor(() => {
+        expect(mockStreamChatResponse).toHaveBeenCalledTimes(1);
+      });
+      expect(mockStreamChatResponse).toHaveBeenCalledWith("session-model", "Hello quick mobile", expect.any(Object), [], "proj-1");
+      expect(await screen.findByTestId("quick-chat-stop")).toBeInTheDocument();
+      expect(document.activeElement).toBe(input);
+    } finally {
+      isIOSSpy.mockRestore();
+    }
+  });
+
+  it("FN-6301: Android mobile composer touchstart leaves native focus uncanceled", async () => {
+    Object.defineProperty(window, "innerWidth", { configurable: true, value: 390 });
+    window.dispatchEvent(new Event("resize"));
+    mockUseViewportMode.mockReturnValue("mobile");
+    const isIOSSpy = vi.spyOn(mobileScrollLock, "isIOS").mockReturnValue(false);
+
+    try {
+      render(<QuickChatFAB addToast={vi.fn()} projectId="proj-1" />);
+      fireEvent.click(screen.getByTestId("quick-chat-fab"));
+
+      const input = await screen.findByTestId("quick-chat-input") as HTMLTextAreaElement;
+      await waitFor(() => expect(input).not.toBeDisabled());
+      input.blur();
+
+      const touchEvent = new TouchEvent("touchstart", { bubbles: true, cancelable: true });
+      const preventDefaultSpy = vi.spyOn(touchEvent, "preventDefault");
+      fireEvent(input, touchEvent);
+      if (!touchEvent.defaultPrevented) {
+        input.focus();
+      }
+
+      expect(preventDefaultSpy).not.toHaveBeenCalled();
+      expect(document.activeElement).toBe(input);
+    } finally {
+      isIOSSpy.mockRestore();
+    }
+  });
+
   it("uses icon-only model tag without pill styling when mobile header fallback is active", async () => {
     Object.defineProperty(window, "innerWidth", { configurable: true, value: 390 });
     window.dispatchEvent(new Event("resize"));