feat: implement mobile terminal UX

- Add mobile viewport detection hook
- Add virtual keyboard detection with fallback
- Add auto-hide hook for header/keys strip
- Add special keys mapping hook
- Create MobileTerminalHeader, SpecialKeysStrip, SpecialKeysPanel components
- Create MobileTerminalWrapper component
- Update TerminalComponent with mobile support, font scaling, copy/paste, reconnection
- Update AppShell to hide chrome on mobile terminal pages
- Update TerminalPage to use MobileTerminalWrapper
- Add comprehensive mobile terminal styles
- TypeScript check passes
- Build succeeds

apps/web/src/hooks/use-auto-hide.ts

@@ -0,0 +1,68 @@
+import { useState, useEffect, useCallback, useRef } from "react";
+
+interface AutoHideOptions {
+  timeout?: number;
+  enabled?: boolean;
+}
+
+export function useAutoHide(options: AutoHideOptions = {}) {
+  const { timeout = 3000, enabled = true } = options;
+  const [isVisible, setIsVisible] = useState(true);
+  const timerRef = useRef<ReturnType<typeof setTimeout> | null>(null);
+  const lastInteractionRef = useRef(Date.now());
+
+  const show = useCallback(() => {
+    if (!enabled) return;
+    setIsVisible(true);
+    lastInteractionRef.current = Date.now();
+
+    if (timerRef.current) {
+      clearTimeout(timerRef.current);
+    }
+
+    timerRef.current = setTimeout(() => {
+      setIsVisible(false);
+    }, timeout);
+  }, [enabled, timeout]);
+
+  const hide = useCallback(() => {
+    if (!enabled) return;
+    setIsVisible(false);
+    if (timerRef.current) {
+      clearTimeout(timerRef.current);
+      timerRef.current = null;
+    }
+  }, [enabled]);
+
+  const toggle = useCallback(() => {
+    if (!enabled) return;
+    if (isVisible) {
+      hide();
+    } else {
+      show();
+    }
+  }, [enabled, isVisible, show, hide]);
+
+  useEffect(() => {
+    if (!enabled) {
+      setIsVisible(true);
+      return;
+    }
+
+    // Start the timer initially
+    show();
+
+    return () => {
+      if (timerRef.current) {
+        clearTimeout(timerRef.current);
+      }
+    };
+  }, [enabled, show]);
+
+  return {
+    isVisible,
+    show,
+    hide,
+    toggle,
+  };
+}

apps/web/src/hooks/use-mobile-viewport.ts

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+import { useState, useEffect } from "react";
+
+const MOBILE_BREAKPOINT = 768;
+
+export function useMobileViewport() {
+  const [isMobile, setIsMobile] = useState(() => {
+    if (typeof window === "undefined") return false;
+    return window.innerWidth < MOBILE_BREAKPOINT;
+  });
+
+  useEffect(() => {
+    const handleResize = () => {
+      setIsMobile(window.innerWidth < MOBILE_BREAKPOINT);
+    };
+
+    window.addEventListener("resize", handleResize);
+    return () => window.removeEventListener("resize", handleResize);
+  }, []);
+
+  return isMobile;
+}

apps/web/src/hooks/use-special-keys.ts

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+import { useCallback } from "react";
+
+export type SpecialKey =
+  | "escape"
+  | "tab"
+  | "ctrl"
+  | "alt"
+  | "up"
+  | "down"
+  | "left"
+  | "right"
+  | "home"
+  | "end"
+  | "pageup"
+  | "pagedown"
+  | "ctrlc"
+  | "ctrld"
+  | "ctrlz"
+  | "f1"
+  | "f2"
+  | "f3"
+  | "f4"
+  | "f5"
+  | "f6"
+  | "f7"
+  | "f8"
+  | "f9"
+  | "f10"
+  | "f11"
+  | "f12";
+
+const KEY_SEQUENCES: Record<SpecialKey, string> = {
+  escape: "\x1B",
+  tab: "\t",
+  ctrl: "",
+  alt: "",
+  up: "\x1B[A",
+  down: "\x1B[B",
+  right: "\x1B[C",
+  left: "\x1B[D",
+  home: "\x1B[H",
+  end: "\x1B[F",
+  pageup: "\x1B[5~",
+  pagedown: "\x1B[6~",
+  ctrlc: "\x03",
+  ctrld: "\x04",
+  ctrlz: "\x1A",
+  f1: "\x1BOP",
+  f2: "\x1BOQ",
+  f3: "\x1BOR",
+  f4: "\x1BOS",
+  f5: "\x1B[15~",
+  f6: "\x1B[17~",
+  f7: "\x1B[18~",
+  f8: "\x1B[19~",
+  f9: "\x1B[20~",
+  f10: "\x1B[21~",
+  f11: "\x1B[23~",
+  f12: "\x1B[24~",
+};
+
+interface UseSpecialKeysOptions {
+  onSend: (data: string) => void;
+}
+
+export function useSpecialKeys({ onSend }: UseSpecialKeysOptions) {
+  const sendKey = useCallback(
+    (key: SpecialKey) => {
+      const sequence = KEY_SEQUENCES[key];
+      if (sequence) {
+        onSend(sequence);
+      }
+    },
+    [onSend]
+  );
+
+  return { sendKey };
+}
+
+export { KEY_SEQUENCES };

apps/web/src/hooks/use-virtual-keyboard.ts

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+import { useState, useEffect, useCallback } from "react";
+
+interface VirtualKeyboardState {
+  isOpen: boolean;
+  height: number;
+  viewportHeight: number;
+}
+
+export function useVirtualKeyboard() {
+  const [state, setState] = useState<VirtualKeyboardState>({
+    isOpen: false,
+    height: 0,
+    viewportHeight: typeof window !== "undefined" ? window.innerHeight : 0,
+  });
+
+  const updateKeyboardState = useCallback(() => {
+    const visualViewport = window.visualViewport;
+    const windowHeight = window.innerHeight;
+
+    if (visualViewport) {
+      const viewportHeight = visualViewport.height;
+      const keyboardHeight = windowHeight - viewportHeight;
+      const isOpen = keyboardHeight > 100; // Threshold to avoid false positives
+
+      setState({
+        isOpen,
+        height: keyboardHeight,
+        viewportHeight,
+      });
+    } else {
+      // Fallback: compare window height to a stored reference
+      // This is less reliable but works on older browsers
+      const currentHeight = windowHeight;
+      const isOpen = currentHeight < state.viewportHeight - 100;
+
+      setState((prev) => ({
+        isOpen,
+        height: isOpen ? prev.viewportHeight - currentHeight : 0,
+        viewportHeight: isOpen ? prev.viewportHeight : currentHeight,
+      }));
+    }
+  }, [state.viewportHeight]);
+
+  useEffect(() => {
+    const visualViewport = window.visualViewport;
+
+    if (visualViewport) {
+      visualViewport.addEventListener("resize", updateKeyboardState);
+      visualViewport.addEventListener("scroll", updateKeyboardState);
+    } else {
+      window.addEventListener("resize", updateKeyboardState);
+    }
+
+    // Initial check
+    updateKeyboardState();
+
+    return () => {
+      if (visualViewport) {
+        visualViewport.removeEventListener("resize", updateKeyboardState);
+        visualViewport.removeEventListener("scroll", updateKeyboardState);
+      } else {
+        window.removeEventListener("resize", updateKeyboardState);
+      }
+    };
+  }, [updateKeyboardState]);
+
+  return state;
+}