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-special-keys.ts

@@ -0,0 +1,80 @@
+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 };