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/pages/terminal.tsx

@@ -1,11 +1,13 @@
 import React from "react";
 import { useNavigate, useParams } from "react-router-dom";
 import { TerminalComponent } from "../components/terminal";
-import { Icon } from "../components/icon";
+import { MobileTerminalWrapper } from "../components/mobile-terminal-wrapper";
+import { useMobileViewport } from "../hooks/use-mobile-viewport";
 
 export const TerminalPage: React.FC = () => {
   const { instanceId } = useParams<{ instanceId: string }>();
   const navigate = useNavigate();
+  const isMobile = useMobileViewport();
 
   if (!instanceId) {
     return (
@@ -16,6 +18,16 @@ export const TerminalPage: React.FC = () => {
     );
   }
 
+  if (isMobile) {
+    return (
+      <MobileTerminalWrapper
+        instanceId={instanceId}
+        onBack={() => navigate(-1)}
+        onClose={() => navigate(-1)}
+      />
+    );
+  }
+
   return (
     <section className="terminal-page">
       <div className="terminal-page-header">
@@ -24,7 +36,6 @@ export const TerminalPage: React.FC = () => {
           onClick={() => navigate(-1)}
           type="button"
         >
-          <Icon name="arrow-left" size="sm" />
           Back
         </button>
         <h1>Terminal</h1>
@@ -32,6 +43,7 @@ export const TerminalPage: React.FC = () => {
       <TerminalComponent
         instanceId={instanceId}
         onClose={() => navigate(-1)}
+        isMobile={false}
       />
     </section>
   );