fix: lift modifier state to MobileTerminalWrapper for virtual keyboard integration

- Remove useSpecialKeys hook state, export pure utility functions instead
- MobileTerminalWrapper now owns activeModifier state
- SpecialKeysStrip and SpecialKeysPanel receive modifier via props
- TerminalComponent applies modifier to virtual keyboard input via activeModifier prop
- Modifier now works with both special keys AND virtual keyboard input
- Modifier clears after any key press (special or virtual keyboard)

apps/web/src/components/mobile-terminal-wrapper.tsx

@@ -6,6 +6,7 @@ import { SpecialKeysPanel } from "./special-keys-panel";
 import { useMobileViewport } from "../hooks/use-mobile-viewport";
 import { useVirtualKeyboard } from "../hooks/use-virtual-keyboard";
 import { useAutoHide } from "../hooks/use-auto-hide";
+import type { ModifierKey } from "../hooks/use-special-keys";
 
 interface MobileTerminalWrapperProps {
   instanceId: string;
@@ -26,6 +27,7 @@ export const MobileTerminalWrapper: React.FC<MobileTerminalWrapperProps> = ({
   const { isOpen: isKeyboardOpen, height: keyboardHeight } =
     useVirtualKeyboard();
   const [showPanel, setShowPanel] = useState(false);
+  const [activeModifier, setActiveModifier] = useState<ModifierKey | null>(null);
   const [terminalRef, setTerminalRef] = useState<{
     sendData: (data: string) => void;
     connectionStatus: "connecting" | "connected" | "disconnected" | "error";
@@ -84,6 +86,8 @@ export const MobileTerminalWrapper: React.FC<MobileTerminalWrapperProps> = ({
           instanceId={instanceId}
           onClose={onClose}
           isMobile={true}
+          activeModifier={activeModifier}
+          onModifierChange={setActiveModifier}
           onTerminalReady={handleTerminalReady}
         />
       </div>
@@ -93,6 +97,8 @@ export const MobileTerminalWrapper: React.FC<MobileTerminalWrapperProps> = ({
         isVisible={!showPanel}
         onMoreClick={() => setShowPanel(true)}
         onKeepFocus={() => terminalRef?.focusInput()}
+        activeModifier={activeModifier}
+        onModifierChange={setActiveModifier}
       />
 
       <SpecialKeysPanel
@@ -100,6 +106,8 @@ export const MobileTerminalWrapper: React.FC<MobileTerminalWrapperProps> = ({
         isOpen={showPanel}
         onClose={() => setShowPanel(false)}
         onKeepFocus={() => terminalRef?.focusInput()}
+        activeModifier={activeModifier}
+        onModifierChange={setActiveModifier}
       />
     </div>
   );

apps/web/src/components/special-keys-panel.tsx

@@ -1,11 +1,13 @@
 import React from "react";
-import { useSpecialKeys, type SpecialKey } from "../hooks/use-special-keys";
+import { getSequenceWithModifier, type SpecialKey, type ModifierKey } from "../hooks/use-special-keys";
 
 interface SpecialKeysPanelProps {
   onSend: (data: string) => void;
   isOpen: boolean;
   onClose: () => void;
   onKeepFocus?: () => void;
+  activeModifier: ModifierKey | null;
+  onModifierChange: (modifier: ModifierKey | null) => void;
 }
 
 const EXPANDED_KEYS: { key: SpecialKey; label: string }[] = [
@@ -38,14 +40,22 @@ export const SpecialKeysPanel: React.FC<SpecialKeysPanelProps> = ({
   isOpen,
   onClose,
   onKeepFocus,
+  activeModifier,
+  onModifierChange,
 }) => {
-  const { sendKey, clearModifier } = useSpecialKeys({ onSend });
-
   if (!isOpen) return null;
 
   const handlePointerDown = (e: React.PointerEvent, key: SpecialKey) => {
     e.preventDefault();
-    sendKey(key);
+
+    const result = getSequenceWithModifier(key, activeModifier);
+    if (result) {
+      onSend(result.sequence);
+      if (result.clearModifier) {
+        onModifierChange(null);
+      }
+    }
+
     onClose();
     // Always refocus terminal after sending
     requestAnimationFrame(() => {
@@ -55,7 +65,7 @@ export const SpecialKeysPanel: React.FC<SpecialKeysPanelProps> = ({
 
   const handleOverlayPointerDown = (e: React.PointerEvent) => {
     e.preventDefault();
-    clearModifier();
+    onModifierChange(null);
     onClose();
     requestAnimationFrame(() => {
       onKeepFocus?.();

apps/web/src/components/special-keys-strip.tsx

@@ -1,11 +1,13 @@
 import React from "react";
-import { useSpecialKeys, type SpecialKey, type ModifierKey } from "../hooks/use-special-keys";
+import { getSequenceWithModifier, type SpecialKey, type ModifierKey, KEY_SEQUENCES } from "../hooks/use-special-keys";
 
 interface SpecialKeysStripProps {
   onSend: (data: string) => void;
   isVisible: boolean;
   onMoreClick?: () => void;
   onKeepFocus?: () => void;
+  activeModifier: ModifierKey | null;
+  onModifierChange: (modifier: ModifierKey | null) => void;
 }
 
 const PRIMARY_KEYS: { key: SpecialKey; label: string; isModifier?: boolean }[] = [
@@ -24,12 +26,29 @@ export const SpecialKeysStrip: React.FC<SpecialKeysStripProps> = ({
   isVisible,
   onMoreClick,
   onKeepFocus,
+  activeModifier,
+  onModifierChange,
 }) => {
-  const { sendKey, activeModifier } = useSpecialKeys({ onSend });
-
   const handlePointerDown = (e: React.PointerEvent, key: SpecialKey) => {
     e.preventDefault();
-    sendKey(key);
+
+    // Handle modifier keys (one-shot)
+    if (key === "ctrl" || key === "alt") {
+      onModifierChange(activeModifier === key ? null : key);
+      requestAnimationFrame(() => {
+        onKeepFocus?.();
+      });
+      return;
+    }
+
+    const result = getSequenceWithModifier(key, activeModifier);
+    if (result) {
+      onSend(result.sequence);
+      if (result.clearModifier) {
+        onModifierChange(null);
+      }
+    }
+
     // Always refocus terminal after sending
     requestAnimationFrame(() => {
       onKeepFocus?.();

apps/web/src/components/terminal.tsx

@@ -4,10 +4,14 @@ import { FitAddon } from "xterm-addon-fit";
 import { WebLinksAddon } from "xterm-addon-web-links";
 import "xterm/css/xterm.css";
 
+import { applyModifierToChar, type ModifierKey } from "../hooks/use-special-keys";
+
 interface TerminalProps {
   instanceId: string;
   onClose?: () => void;
   isMobile?: boolean;
+  activeModifier?: ModifierKey | null;
+  onModifierChange?: (modifier: ModifierKey | null) => void;
   onTerminalReady?: (
     sendData: (data: string) => void,
     connectionStatus: "connecting" | "connected" | "disconnected" | "error",
@@ -25,6 +29,8 @@ export const TerminalComponent: React.FC<TerminalProps> = ({
   instanceId,
   onClose,
   isMobile = false,
+  activeModifier,
+  onModifierChange,
   onTerminalReady,
 }) => {
   const terminalRef = useRef<HTMLDivElement>(null);
@@ -39,6 +45,8 @@ export const TerminalComponent: React.FC<TerminalProps> = ({
     "connecting" | "connected" | "disconnected" | "error"
   >("connecting");
   const [error, setError] = useState<string | null>(null);
+  const activeModifierRef = useRef(activeModifier);
+  activeModifierRef.current = activeModifier;
   const [fontSize, setFontSize] = useState(() => {
     if (typeof window === "undefined") return isMobile ? 16 : 14;
     const stored = localStorage.getItem(FONT_SIZE_KEY);
@@ -161,9 +169,20 @@ export const TerminalComponent: React.FC<TerminalProps> = ({
 
     // Handle terminal input
     term.onData((data) => {
-      if (ws.readyState === WebSocket.OPEN) {
-        ws.send(data);
+      if (ws.readyState !== WebSocket.OPEN) return;
+
+      // Apply active modifier to single-character input
+      const modifier = activeModifierRef.current;
+      if (modifier && data.length === 1) {
+        const modified = applyModifierToChar(data, modifier);
+        if (modified) {
+          ws.send(modified);
+          onModifierChange?.(null);
+          return;
+        }
       }
+
+      ws.send(data);
     });
 
     // Handle resize with debounce