feat(dashboard): mobile terminal input bar with sticky Ctrl accessory keys (U13)

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

packages/dashboard/app/components/SessionTerminal.css

@@ -163,3 +163,114 @@
   background: var(--card);
   border-color: var(--border);
 }
+
+/* ── Mobile input model (U13) ──────────────────────────────────────────────
+ * Visible input field + accessory key bar. xterm's hidden-textarea input is
+ * unreliable on mobile (KTD), so the bar is the primary input surface. The
+ * bar is a fixed footer that lifts above the virtual keyboard when it opens
+ * (driven by useMobileKeyboard's keyboardOverlap, applied inline).
+ */
+.cli-session-terminal__mobile-bar {
+  position: sticky;
+  bottom: 0;
+  z-index: 5;
+  display: flex;
+  flex-direction: column;
+  gap: var(--space-xs);
+  padding: var(--space-xs) var(--space-sm)
+    calc(var(--space-sm) + env(safe-area-inset-bottom, 0px));
+  background: var(--surface);
+  border-top: 1px solid var(--border);
+}
+
+.cli-session-terminal__mobile-bar--keyboard-open {
+  position: fixed;
+  left: 0;
+  right: 0;
+  /* `bottom` is set inline to keyboardOverlap so the bar clears the keyboard. */
+  padding-bottom: var(--space-sm);
+}
+
+.cli-session-terminal__key-row {
+  display: flex;
+  gap: var(--space-xs);
+  overflow-x: auto;
+  -webkit-overflow-scrolling: touch;
+  scrollbar-width: none;
+}
+
+.cli-session-terminal__key-row::-webkit-scrollbar {
+  display: none;
+}
+
+.cli-terminal-key {
+  flex: 0 0 auto;
+  min-width: 40px;
+  min-height: 36px;
+  padding: var(--space-xs) var(--space-sm);
+  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
+  font-size: 0.8125rem;
+  color: var(--text);
+  background: var(--card);
+  border: 1px solid var(--border);
+  border-radius: var(--radius-sm);
+  cursor: pointer;
+  touch-action: manipulation;
+}
+
+.cli-terminal-key:active {
+  background: var(--card-hover);
+}
+
+.cli-terminal-key--ctrl.cli-terminal-key--active {
+  color: var(--accent-text, var(--button-primary-text));
+  background: var(--accent, var(--color-primary));
+  border-color: var(--accent, var(--color-primary));
+}
+
+.cli-terminal-key--ctrlc {
+  color: var(--warning, var(--color-warning));
+  border-color: var(--warning, var(--color-warning));
+}
+
+.cli-session-terminal__input-row {
+  display: flex;
+  gap: var(--space-xs);
+}
+
+.cli-session-terminal__mobile-input {
+  flex: 1 1 auto;
+  min-width: 0;
+  min-height: 38px;
+  padding: var(--space-xs) var(--space-sm);
+  font-size: 16px; /* >=16px avoids iOS focus zoom */
+  color: var(--text);
+  background: var(--input-bg, var(--bg));
+  border: 1px solid var(--border);
+  border-radius: var(--radius-sm);
+}
+
+.cli-session-terminal__mobile-input:focus {
+  outline: none;
+  border-color: var(--accent, var(--color-primary));
+}
+
+.cli-session-terminal__mobile-send {
+  flex: 0 0 auto;
+  min-height: 38px;
+  padding: var(--space-xs) var(--space-md);
+  font-size: 0.8125rem;
+  color: var(--button-primary-text, var(--accent-text));
+  background: var(--button-primary-bg, var(--accent));
+  border: 1px solid transparent;
+  border-radius: var(--radius-sm);
+  cursor: pointer;
+  touch-action: manipulation;
+}
+
+/* On mobile the terminal viewport is read-mostly; the bar drives input. */
+@media (max-width: 768px), (max-height: 480px) {
+  .cli-session-terminal__viewport {
+    -webkit-overflow-scrolling: touch;
+  }
+}

packages/dashboard/app/components/SessionTerminal.tsx

@@ -6,6 +6,7 @@ import { Terminal as TerminalIcon, ShieldAlert, Settings, Eye } from "lucide-rea
 import type { Terminal as XTerm, ITerminalAddon } from "@xterm/xterm";
 import { appendTokenQuery } from "../auth";
 import { api } from "../api";
+import { useMobileKeyboard } from "../hooks/useMobileKeyboard";
 
 /**
  * SessionTerminal (CLI Agent Executor, U11) — shared xterm terminal for a CLI
@@ -26,6 +27,70 @@ import { api } from "../api";
 const ACK_THRESHOLD_BYTES = 32 * 1024;
 const RESIZE_DEBOUNCE_MS = 100;
 
+/**
+ * Canonical mobile breakpoint (matches the repo CSS convention). Landscape
+ * phones exceed 768px wide, so the height clause covers them too.
+ */
+const MOBILE_MEDIA_QUERY = "(max-width: 768px), (max-height: 480px)";
+
+/**
+ * Control sequences emitted by the accessory key bar (U13). These are
+ * deliberate user keystrokes routed straight to the session input path —
+ * exempt from U2's injected-text neutralization (which governs composed /
+ * injected strings, not real keystrokes).
+ */
+const SEQ_ESC = "\x1b"; // 0x1B
+const SEQ_TAB = "\x09"; // 0x09
+const SEQ_CTRL_C = "\x03"; // 0x03
+const SEQ_ARROW_UP = "\x1b[A"; // CSI A
+const SEQ_ARROW_DOWN = "\x1b[B"; // CSI B
+const SEQ_ARROW_RIGHT = "\x1b[C"; // CSI C
+const SEQ_ARROW_LEFT = "\x1b[D"; // CSI D
+
+/**
+ * Resolve the control byte for a sticky-Ctrl + key combination. Ctrl maps a
+ * letter to its control code (A→0x01 … Z→0x1A): code = (toUpper(ch) & 0x1f).
+ * Returns null for keys that have no meaningful Ctrl combination.
+ */
+function ctrlCombo(key: string): string | null {
+  if (key.length !== 1) return null;
+  const upper = key.toUpperCase();
+  const code = upper.charCodeAt(0);
+  if (code >= 0x40 && code <= 0x5f) {
+    // @ A-Z [ \ ] ^ _  → 0x00-0x1F
+    return String.fromCharCode(code & 0x1f);
+  }
+  return null;
+}
+
+/** Reactive mobile-viewport detection via the repo breakpoint convention. */
+function useIsMobileViewport(): boolean {
+  const [isMobile, setIsMobile] = useState<boolean>(() => {
+    if (typeof window === "undefined" || typeof window.matchMedia !== "function") {
+      return false;
+    }
+    return window.matchMedia(MOBILE_MEDIA_QUERY).matches;
+  });
+
+  useEffect(() => {
+    if (typeof window === "undefined" || typeof window.matchMedia !== "function") {
+      return;
+    }
+    const mql = window.matchMedia(MOBILE_MEDIA_QUERY);
+    const onChange = () => setIsMobile(mql.matches);
+    onChange();
+    // Safari < 14 only has addListener/removeListener.
+    if (typeof mql.addEventListener === "function") {
+      mql.addEventListener("change", onChange);
+      return () => mql.removeEventListener("change", onChange);
+    }
+    mql.addListener(onChange);
+    return () => mql.removeListener(onChange);
+  }, []);
+
+  return isMobile;
+}
+
 /** The posture surfaced on the session record (denormalized at launch, U15). */
 export interface SessionTerminalPosture {
   /** Adapter display name (single Terminal icon for all adapters). */
@@ -109,6 +174,86 @@ export function SessionTerminal({
   const [advanceDismissed, setAdvanceDismissed] = useState(false);
   const [advancePending, setAdvancePending] = useState(false);
 
+  // ── Mobile input model (U13) ───────────────────────────────────────────────
+  const isMobile = useIsMobileViewport();
+  // Only arm keyboard tracking on mobile (the hook no-ops off-mobile anyway).
+  const { keyboardOpen, keyboardOverlap } = useMobileKeyboard({ enabled: isMobile });
+  const inputRef = useRef<HTMLInputElement | null>(null);
+  const [mobileInput, setMobileInput] = useState("");
+  // Sticky Ctrl: tap Ctrl, then the next tapped key combines into a control
+  // sequence (Ctrl-C → 0x03, Ctrl-D → 0x04, Ctrl-Z → 0x1A).
+  const [ctrlSticky, setCtrlSticky] = useState(false);
+
+  /** Write raw bytes to the session input path (mobile bar + submit). */
+  const sendInput = useCallback((data: string) => {
+    if (!data) return;
+    const ws = wsRef.current;
+    if (ws?.readyState === WebSocket.OPEN) {
+      ws.send(JSON.stringify({ type: "input", data }));
+    }
+  }, []);
+
+  /**
+   * Emit one accessory-bar key. If sticky Ctrl is active and the key has a
+   * Ctrl combination, send the combined control byte and clear the modifier;
+   * otherwise send the literal sequence. Keeps the input focused (the caller's
+   * pointerdown preventDefault stops the blur).
+   */
+  const emitBarKey = useCallback(
+    (seq: string) => {
+      if (ctrlSticky) {
+        const combined = ctrlCombo(seq);
+        setCtrlSticky(false);
+        if (combined) {
+          sendInput(combined);
+          return;
+        }
+      }
+      sendInput(seq);
+    },
+    [ctrlSticky, sendInput],
+  );
+
+  /** iOS composer pattern: keep focus on the visible input when tapping a key. */
+  const keepFocus = useCallback((e: { preventDefault: () => void }) => {
+    e.preventDefault();
+  }, []);
+
+  const handleMobileSubmit = useCallback(
+    (e?: { preventDefault?: () => void }) => {
+      e?.preventDefault?.();
+      // User-typed text + Enter — deliberate input, no neutralization.
+      if (mobileInput) sendInput(mobileInput);
+      sendInput("\r");
+      setMobileInput("");
+    },
+    [mobileInput, sendInput],
+  );
+
+  /**
+   * Input onChange. When sticky Ctrl is armed, the next typed character is
+   * captured as a Ctrl combination (Ctrl-D `0x04`, Ctrl-Z `0x1A`, …) instead of
+   * landing in the field — this is how Ctrl-letter chords beyond the bar's
+   * dedicated Ctrl-C are reached on mobile. Otherwise the value updates
+   * normally for free-text + Enter submit.
+   */
+  const handleMobileInputChange = useCallback(
+    (next: string) => {
+      if (ctrlSticky && next.length > mobileInput.length) {
+        // The newly-typed character is the last one appended.
+        const ch = next.slice(mobileInput.length, mobileInput.length + 1);
+        const combined = ctrlCombo(ch);
+        setCtrlSticky(false);
+        if (combined) {
+          sendInput(combined);
+          return; // swallow — do not echo the raw key into the field
+        }
+      }
+      setMobileInput(next);
+    },
+    [ctrlSticky, mobileInput, sendInput],
+  );
+
   // Re-arm the strip whenever a fresh idle window is offered.
   useEffect(() => {
     if (showConfirmAdvance) setAdvanceDismissed(false);
@@ -323,7 +468,15 @@ export function SessionTerminal({
   const flagSummary = posture?.elevatedFlags?.join(", ");
 
   return (
-    <div className="cli-session-terminal" data-mode={mode} data-read-only={readOnly}>
+    <div
+      className={`cli-session-terminal${isMobile ? " cli-session-terminal--mobile" : ""}${
+        isMobile && keyboardOpen ? " cli-session-terminal--keyboard-open" : ""
+      }`}
+      data-mode={mode}
+      data-read-only={readOnly}
+      data-mobile={isMobile}
+      data-keyboard-open={isMobile && keyboardOpen}
+    >
       <header className="cli-session-terminal__header">
         {posture && (
           <div className="cli-session-terminal__posture-wrap">
@@ -424,6 +577,154 @@ export function SessionTerminal({
           </div>
         </div>
       )}
+
+      {isMobile && !readOnly && (
+        <div
+          className={`cli-session-terminal__mobile-bar${
+            keyboardOpen ? " cli-session-terminal__mobile-bar--keyboard-open" : ""
+          }`}
+          data-testid="cli-terminal-mobile-bar"
+          style={
+            // Lift the fixed footer above the virtual keyboard when it's open.
+            keyboardOpen ? { bottom: `${keyboardOverlap}px` } : undefined
+          }
+        >
+          <div
+            className="cli-session-terminal__key-row"
+            data-testid="cli-terminal-key-bar"
+          >
+            <button
+              type="button"
+              className={`cli-terminal-key cli-terminal-key--ctrl${
+                ctrlSticky ? " cli-terminal-key--active" : ""
+              }`}
+              data-testid="cli-key-ctrl"
+              aria-label={t("cliTerminal.mobileKeyCtrl", "Sticky Ctrl modifier")}
+              aria-pressed={ctrlSticky}
+              onPointerDown={keepFocus}
+              onMouseDown={keepFocus}
+              onClick={() => setCtrlSticky((v) => !v)}
+            >
+              Ctrl
+            </button>
+            <button
+              type="button"
+              className="cli-terminal-key"
+              data-testid="cli-key-esc"
+              aria-label={t("cliTerminal.mobileKeyEsc", "Send Escape")}
+              onPointerDown={keepFocus}
+              onMouseDown={keepFocus}
+              onClick={() => emitBarKey(SEQ_ESC)}
+            >
+              Esc
+            </button>
+            <button
+              type="button"
+              className="cli-terminal-key"
+              data-testid="cli-key-tab"
+              aria-label={t("cliTerminal.mobileKeyTab", "Send Tab")}
+              onPointerDown={keepFocus}
+              onMouseDown={keepFocus}
+              onClick={() => emitBarKey(SEQ_TAB)}
+            >
+              Tab
+            </button>
+            <button
+              type="button"
+              className="cli-terminal-key cli-terminal-key--ctrlc"
+              data-testid="cli-key-ctrl-c"
+              aria-label={t("cliTerminal.mobileKeyCtrlC", "Send Ctrl-C")}
+              onPointerDown={keepFocus}
+              onMouseDown={keepFocus}
+              onClick={() => {
+                // Dedicated shortcut: always Ctrl-C, regardless of sticky state.
+                setCtrlSticky(false);
+                sendInput(SEQ_CTRL_C);
+              }}
+            >
+              ^C
+            </button>
+            <button
+              type="button"
+              className="cli-terminal-key"
+              data-testid="cli-key-arrow-up"
+              aria-label={t("cliTerminal.mobileKeyArrowUp", "Cursor up")}
+              onPointerDown={keepFocus}
+              onMouseDown={keepFocus}
+              onClick={() => emitBarKey(SEQ_ARROW_UP)}
+            >
+              ↑
+            </button>
+            <button
+              type="button"
+              className="cli-terminal-key"
+              data-testid="cli-key-arrow-down"
+              aria-label={t("cliTerminal.mobileKeyArrowDown", "Cursor down")}
+              onPointerDown={keepFocus}
+              onMouseDown={keepFocus}
+              onClick={() => emitBarKey(SEQ_ARROW_DOWN)}
+            >
+              ↓
+            </button>
+            <button
+              type="button"
+              className="cli-terminal-key"
+              data-testid="cli-key-arrow-left"
+              aria-label={t("cliTerminal.mobileKeyArrowLeft", "Cursor left")}
+              onPointerDown={keepFocus}
+              onMouseDown={keepFocus}
+              onClick={() => emitBarKey(SEQ_ARROW_LEFT)}
+            >
+              ←
+            </button>
+            <button
+              type="button"
+              className="cli-terminal-key"
+              data-testid="cli-key-arrow-right"
+              aria-label={t("cliTerminal.mobileKeyArrowRight", "Cursor right")}
+              onPointerDown={keepFocus}
+              onMouseDown={keepFocus}
+              onClick={() => emitBarKey(SEQ_ARROW_RIGHT)}
+            >
+              →
+            </button>
+          </div>
+          <form
+            className="cli-session-terminal__input-row"
+            onSubmit={handleMobileSubmit}
+          >
+            <input
+              ref={inputRef}
+              type="text"
+              className="cli-session-terminal__mobile-input"
+              data-testid="cli-terminal-mobile-input"
+              value={mobileInput}
+              placeholder={t(
+                "cliTerminal.mobileInputPlaceholder",
+                "Type to send to the session…",
+              )}
+              autoCapitalize="off"
+              autoCorrect="off"
+              autoComplete="off"
+              spellCheck={false}
+              onChange={(e) => handleMobileInputChange(e.target.value)}
+            />
+            <button
+              type="submit"
+              className="cli-session-terminal__mobile-send"
+              data-testid="cli-terminal-mobile-send"
+              aria-label={t("cliTerminal.mobileSend", "Send")}
+              // iOS pattern: act on click, preventDefault on pointer/mouse down
+              // so the input doesn't blur (which dismisses the keyboard).
+              onPointerDown={keepFocus}
+              onMouseDown={keepFocus}
+              onClick={() => handleMobileSubmit()}
+            >
+              {t("cliTerminal.mobileSend", "Send")}
+            </button>
+          </form>
+        </div>
+      )}
     </div>
   );
 }

packages/dashboard/app/components/__tests__/SessionTerminal.mobile.test.tsx

@@ -0,0 +1,371 @@
+import { describe, it, expect, vi, beforeEach, afterEach } from "vitest";
+import { act, render, screen, fireEvent, waitFor } from "@testing-library/react";
+import { _resetInitialViewportHeight } from "../../hooks/useMobileKeyboard";
+
+// ── Mock xterm + addon dynamic imports (jsdom has no canvas/WebGL) ──────────
+const mockTerm = {
+  loadAddon: vi.fn(),
+  open: vi.fn(),
+  onData: vi.fn(),
+  write: vi.fn((_data: string, cb?: () => void) => cb?.()),
+  dispose: vi.fn(),
+  unicode: { activeVersion: "6" },
+  cols: 80,
+  rows: 24,
+};
+vi.mock("@xterm/xterm", () => ({ Terminal: vi.fn(() => mockTerm) }));
+vi.mock("@xterm/addon-fit", () => ({ FitAddon: vi.fn(() => ({ fit: vi.fn() })) }));
+vi.mock("@xterm/addon-unicode11", () => ({ Unicode11Addon: vi.fn(() => ({})) }));
+vi.mock("@xterm/addon-webgl", () => ({
+  WebglAddon: vi.fn(() => ({ onContextLoss: vi.fn(), dispose: vi.fn() })),
+}));
+
+const apiMock = vi.fn();
+vi.mock("../../api", () => ({ api: (...args: unknown[]) => apiMock(...args) }));
+vi.mock("../../auth", () => ({ appendTokenQuery: (u: string) => u }));
+
+// ── Minimal WebSocket stub ──────────────────────────────────────────────────
+class FakeWS {
+  static instances: FakeWS[] = [];
+  static OPEN = 1;
+  readyState = 1;
+  onopen: (() => void) | null = null;
+  onmessage: ((e: { data: string }) => void) | null = null;
+  onclose: (() => void) | null = null;
+  onerror: (() => void) | null = null;
+  sent: string[] = [];
+  constructor(public url: string) {
+    FakeWS.instances.push(this);
+  }
+  send(d: string) {
+    this.sent.push(d);
+  }
+  close() {
+    this.readyState = 3;
+  }
+}
+(globalThis as unknown as { WebSocket: typeof FakeWS }).WebSocket = FakeWS;
+(globalThis as unknown as { ResizeObserver: unknown }).ResizeObserver = class {
+  observe() {}
+  disconnect() {}
+};
+
+// ── matchMedia mock: drive the mobile breakpoint convention ─────────────────
+let matchMediaMatches = true;
+function installMatchMedia(matches: boolean) {
+  matchMediaMatches = matches;
+  Object.defineProperty(window, "matchMedia", {
+    writable: true,
+    configurable: true,
+    value: vi.fn((query: string) => ({
+      matches: matchMediaMatches,
+      media: query,
+      onchange: null,
+      addEventListener: vi.fn(),
+      removeEventListener: vi.fn(),
+      addListener: vi.fn(),
+      removeListener: vi.fn(),
+      dispatchEvent: vi.fn(),
+    })),
+  });
+}
+
+import { SessionTerminal } from "../SessionTerminal";
+
+/** Pull the parsed input frames a WS has sent. */
+function inputFrames(ws: FakeWS): string[] {
+  return ws.sent
+    .map((raw) => JSON.parse(raw))
+    .filter((m) => m.type === "input")
+    .map((m) => m.data as string);
+}
+
+/** Render and wait for the WS attach channel to open. */
+async function renderMobile(props: Record<string, unknown> = {}) {
+  const utils = render(<SessionTerminal sessionId="s1" {...props} />);
+  await waitFor(() => expect(FakeWS.instances.length).toBe(1));
+  return { ...utils, ws: FakeWS.instances[0] };
+}
+
+beforeEach(() => {
+  FakeWS.instances = [];
+  mockTerm.onData.mockReset();
+  mockTerm.write.mockClear();
+  apiMock.mockReset();
+  apiMock.mockResolvedValue({ ticket: "tkt-1", expiresAt: "", readOnly: false });
+  installMatchMedia(true); // mobile by default
+  _resetInitialViewportHeight();
+});
+
+afterEach(() => {
+  vi.clearAllMocks();
+});
+
+describe("SessionTerminal (mobile)", () => {
+  it("renders the mobile input bar + accessory key bar on mobile viewports", async () => {
+    await renderMobile();
+    expect(screen.getByTestId("cli-terminal-mobile-bar")).toBeTruthy();
+    expect(screen.getByTestId("cli-terminal-key-bar")).toBeTruthy();
+    expect(screen.getByTestId("cli-terminal-mobile-input")).toBeTruthy();
+  });
+
+  it("does not render the mobile bar off-mobile (desktop breakpoint)", async () => {
+    installMatchMedia(false);
+    await renderMobile();
+    expect(screen.queryByTestId("cli-terminal-mobile-bar")).toBeNull();
+  });
+
+  it("does not render the mobile bar when read-only", async () => {
+    apiMock.mockResolvedValue({ ticket: "tkt-1", expiresAt: "", readOnly: true });
+    await renderMobile({ readOnly: true });
+    expect(screen.queryByTestId("cli-terminal-mobile-bar")).toBeNull();
+  });
+
+  // ── Accessory bar control sequences ───────────────────────────────────────
+  it("Esc key emits 0x1b as an input frame", async () => {
+    const { ws } = await renderMobile();
+    fireEvent.click(screen.getByTestId("cli-key-esc"));
+    expect(inputFrames(ws)).toContain("\x1b");
+  });
+
+  it("Tab key emits 0x09", async () => {
+    const { ws } = await renderMobile();
+    fireEvent.click(screen.getByTestId("cli-key-tab"));
+    expect(inputFrames(ws)).toContain("\x09");
+  });
+
+  it("dedicated Ctrl-C shortcut emits 0x03", async () => {
+    const { ws } = await renderMobile();
+    fireEvent.click(screen.getByTestId("cli-key-ctrl-c"));
+    expect(inputFrames(ws)).toContain("\x03");
+  });
+
+  it("arrow keys emit ANSI CSI cursor sequences", async () => {
+    const { ws } = await renderMobile();
+    fireEvent.click(screen.getByTestId("cli-key-arrow-up"));
+    fireEvent.click(screen.getByTestId("cli-key-arrow-down"));
+    fireEvent.click(screen.getByTestId("cli-key-arrow-right"));
+    fireEvent.click(screen.getByTestId("cli-key-arrow-left"));
+    const frames = inputFrames(ws);
+    expect(frames).toContain("\x1b[A");
+    expect(frames).toContain("\x1b[B");
+    expect(frames).toContain("\x1b[C");
+    expect(frames).toContain("\x1b[D");
+  });
+
+  // ── Sticky Ctrl modifier ──────────────────────────────────────────────────
+  it("sticky Ctrl shows an active visual state", async () => {
+    await renderMobile();
+    const ctrl = screen.getByTestId("cli-key-ctrl");
+    expect(ctrl.getAttribute("aria-pressed")).toBe("false");
+
+    fireEvent.click(ctrl);
+    expect(ctrl.getAttribute("aria-pressed")).toBe("true");
+    expect(ctrl.className).toContain("cli-terminal-key--active");
+
+    // Tapping again toggles it back off.
+    fireEvent.click(ctrl);
+    expect(ctrl.getAttribute("aria-pressed")).toBe("false");
+  });
+
+  it("sticky Ctrl + c → 0x03, + d → 0x04, + z → 0x1a (combined, swallowed from field)", async () => {
+    const { ws } = await renderMobile();
+    const ctrl = screen.getByTestId("cli-key-ctrl");
+    const input = screen.getByTestId("cli-terminal-mobile-input") as HTMLInputElement;
+
+    // Ctrl + c
+    fireEvent.click(ctrl);
+    fireEvent.change(input, { target: { value: "c" } });
+    expect(input.value).toBe(""); // combined, not echoed
+    expect(ctrl.getAttribute("aria-pressed")).toBe("false"); // cleared
+
+    // Ctrl + d
+    fireEvent.click(ctrl);
+    fireEvent.change(input, { target: { value: "d" } });
+
+    // Ctrl + z
+    fireEvent.click(ctrl);
+    fireEvent.change(input, { target: { value: "z" } });
+
+    const frames = inputFrames(ws);
+    expect(frames).toContain("\x03"); // Ctrl-C
+    expect(frames).toContain("\x04"); // Ctrl-D
+    expect(frames).toContain("\x1a"); // Ctrl-Z
+  });
+
+  it("without sticky Ctrl, typed letters land in the field (no combine)", async () => {
+    await renderMobile();
+    const input = screen.getByTestId("cli-terminal-mobile-input") as HTMLInputElement;
+    fireEvent.change(input, { target: { value: "d" } });
+    expect(input.value).toBe("d");
+  });
+
+  it("sticky Ctrl + arrow does not combine (no ctrl combo) but clears modifier", async () => {
+    const { ws } = await renderMobile();
+    const ctrl = screen.getByTestId("cli-key-ctrl");
+    fireEvent.click(ctrl);
+    fireEvent.click(screen.getByTestId("cli-key-arrow-up"));
+    // Arrow has no Ctrl combo → literal CSI sequence is sent, modifier clears.
+    expect(inputFrames(ws)).toContain("\x1b[A");
+    expect(ctrl.getAttribute("aria-pressed")).toBe("false");
+  });
+
+  // ── Input field submit ────────────────────────────────────────────────────
+  it("submitting the input field sends the text then \\r", async () => {
+    const { ws } = await renderMobile();
+    const input = screen.getByTestId("cli-terminal-mobile-input") as HTMLInputElement;
+    fireEvent.change(input, { target: { value: "ls -la" } });
+    fireEvent.click(screen.getByTestId("cli-terminal-mobile-send"));
+    const frames = inputFrames(ws);
+    const idx = frames.indexOf("ls -la");
+    expect(idx).toBeGreaterThanOrEqual(0);
+    expect(frames[idx + 1]).toBe("\r");
+    // Field is cleared after submit.
+    expect(input.value).toBe("");
+  });
+
+  it("input is user keystrokes — text is forwarded verbatim (no neutralization)", async () => {
+    const { ws } = await renderMobile();
+    const input = screen.getByTestId("cli-terminal-mobile-input") as HTMLInputElement;
+    // An escape sequence typed by the user is sent verbatim (deliberate input).
+    fireEvent.change(input, { target: { value: "echo \x1b[31m" } });
+    fireEvent.click(screen.getByTestId("cli-terminal-mobile-send"));
+    expect(inputFrames(ws)).toContain("echo \x1b[31m");
+  });
+
+  // ── iOS composer pattern: bar keys do not blur the input ──────────────────
+  it("bar key pointerdown preventDefault keeps the input focused", async () => {
+    await renderMobile();
+    const esc = screen.getByTestId("cli-key-esc");
+    const pdEvent = new Event("pointerdown", { bubbles: true, cancelable: true });
+    esc.dispatchEvent(pdEvent);
+    expect(pdEvent.defaultPrevented).toBe(true);
+  });
+
+  it("send button pointerdown preventDefault keeps the input focused", async () => {
+    await renderMobile();
+    const send = screen.getByTestId("cli-terminal-mobile-send");
+    const pdEvent = new Event("pointerdown", { bubbles: true, cancelable: true });
+    send.dispatchEvent(pdEvent);
+    expect(pdEvent.defaultPrevented).toBe(true);
+  });
+
+  // ── AE6 mobile leg: same live bytes reach term.write ──────────────────────
+  it("mobile attach renders the same live session bytes (data → term.write)", async () => {
+    const { ws } = await renderMobile();
+    const b64 = Buffer.from("live-bytes", "utf8").toString("base64");
+    ws.onmessage?.({ data: JSON.stringify({ type: "data", data: b64 }) });
+    await waitFor(() =>
+      expect(mockTerm.write).toHaveBeenCalledWith("live-bytes", expect.any(Function)),
+    );
+  });
+
+  it("xterm onData input is still attached on mobile (bar is primary, not exclusive)", async () => {
+    await renderMobile();
+    expect(mockTerm.onData).toHaveBeenCalled();
+  });
+});
+
+// ── Keyboard-open (fixed-footer) + pinch-zoom guard ──────────────────────────
+describe("SessionTerminal (mobile) — keyboard-open behavior", () => {
+  let savedVisualViewport: typeof window.visualViewport;
+
+  function installVisualViewport({
+    innerHeight,
+    vvHeight,
+    scale = 1,
+    vvOffsetTop = 0,
+  }: {
+    innerHeight: number;
+    vvHeight: number;
+    scale?: number;
+    vvOffsetTop?: number;
+  }) {
+    (window as unknown as { ontouchstart: unknown }).ontouchstart = null;
+    Object.defineProperty(navigator, "maxTouchPoints", { value: 5, configurable: true });
+    Object.defineProperty(window, "innerWidth", { value: 375, writable: true, configurable: true });
+    Object.defineProperty(window, "innerHeight", {
+      value: innerHeight,
+      writable: true,
+      configurable: true,
+    });
+    const listeners: Record<string, Array<() => void>> = { resize: [], scroll: [] };
+    const mockVV = {
+      width: 375,
+      height: vvHeight,
+      offsetTop: vvOffsetTop,
+      offsetLeft: 0,
+      scale,
+      addEventListener: vi.fn((event: string, cb: () => void) => {
+        listeners[event]?.push(cb);
+      }),
+      removeEventListener: vi.fn(),
+    };
+    Object.defineProperty(window, "visualViewport", {
+      value: mockVV,
+      writable: true,
+      configurable: true,
+    });
+    return { listeners, mockVV };
+  }
+
+  beforeEach(() => {
+    FakeWS.instances = [];
+    mockTerm.onData.mockReset();
+    apiMock.mockReset();
+    apiMock.mockResolvedValue({ ticket: "tkt-1", expiresAt: "", readOnly: false });
+    installMatchMedia(true);
+    _resetInitialViewportHeight();
+    savedVisualViewport = window.visualViewport;
+  });
+
+  afterEach(() => {
+    Object.defineProperty(window, "visualViewport", {
+      value: savedVisualViewport,
+      writable: true,
+      configurable: true,
+    });
+    _resetInitialViewportHeight();
+    vi.clearAllMocks();
+  });
+
+  it("keyboard-open applies the fixed-footer class so the bar is not occluded", async () => {
+    installVisualViewport({ innerHeight: 800, vvHeight: 600 });
+    const input = document.createElement("textarea");
+    document.body.appendChild(input);
+    input.focus();
+
+    render(<SessionTerminal sessionId="s1" />);
+    await waitFor(() => expect(FakeWS.instances.length).toBe(1));
+
+    await waitFor(() => {
+      const bar = screen.getByTestId("cli-terminal-mobile-bar");
+      expect(bar.className).toContain("cli-session-terminal__mobile-bar--keyboard-open");
+      // Bar lifted above the keyboard by keyboardOverlap (800 - 600 = 200).
+      expect(bar.style.bottom).toBe("200px");
+    });
+
+    input.remove();
+  });
+
+  it("pinch-zoom (vv.scale > 1) is NOT treated as keyboard-open", async () => {
+    installVisualViewport({ innerHeight: 800, vvHeight: 600, scale: 2 });
+    const input = document.createElement("textarea");
+    document.body.appendChild(input);
+    input.focus();
+
+    render(<SessionTerminal sessionId="s1" />);
+    await waitFor(() => expect(FakeWS.instances.length).toBe(1));
+
+    // Give the keyboard hook a beat to settle; it must stay closed.
+    await act(async () => {
+      await new Promise((r) => setTimeout(r, 60));
+    });
+
+    const bar = screen.getByTestId("cli-terminal-mobile-bar");
+    expect(bar.className).not.toContain("cli-session-terminal__mobile-bar--keyboard-open");
+    expect(bar.getAttribute("data-keyboard-open")).not.toBe("true");
+
+    input.remove();
+  });
+});

packages/i18n/locales/en/app.json

@@ -6914,6 +6914,16 @@
     "adapterSettings": "Adapter settings",
     "advancePrompt": "This session looks idle — advance to review?",
     "advance": "Advance",
-    "notYet": "Not yet"
+    "notYet": "Not yet",
+    "mobileInputPlaceholder": "Type to send to the session…",
+    "mobileSend": "Send",
+    "mobileKeyEsc": "Send Escape",
+    "mobileKeyTab": "Send Tab",
+    "mobileKeyCtrlC": "Send Ctrl-C",
+    "mobileKeyCtrl": "Sticky Ctrl modifier",
+    "mobileKeyArrowUp": "Cursor up",
+    "mobileKeyArrowDown": "Cursor down",
+    "mobileKeyArrowLeft": "Cursor left",
+    "mobileKeyArrowRight": "Cursor right"
   }
 }