feat: mobile auto-hide header and tabs for multi-session terminal

- Add useAutoHide hook to TerminalPage for mobile header/tab strip
- Header and tabs auto-hide after 3s, tap to reveal
- Add CSS transitions for smooth show/hide on mobile
- Fullscreen mobile mode hides header and tabs completely

apps/web/src/pages/terminal.tsx

@@ -6,6 +6,7 @@ import {
 	type TerminalSessionInfo,
 } from "../components/terminal-session-tabs";
 import { useMobileViewport } from "../hooks/use-mobile-viewport";
+import { useAutoHide } from "../hooks/use-auto-hide";
 import { useTerminalSessions } from "../hooks/use-terminal-sessions";
 import type { TerminalSession } from "../api/terminal";
 
@@ -26,6 +27,7 @@ export const TerminalPage: React.FC = () => {
 	const isMobile = useMobileViewport();
 	const [isFullscreen, setIsFullscreen] = useState(false);
 	const terminalRefs = useRef<Record<string, React.RefObject<TerminalRef>>>({});
+	const headerAutoHide = useAutoHide({ timeout: 3000, enabled: isMobile });
 
 	const {
 		sessions,
@@ -193,34 +195,40 @@ export const TerminalPage: React.FC = () => {
 			<section
 				className={`terminal-page mobile ${isFullscreen ? "fullscreen" : ""}`}
 			>
-				{!isFullscreen && (
-					<div className="terminal-page-header mobile-header">
-						<button
-							className="secondary-button"
-							onClick={() => navigate(-1)}
-							type="button"
-						>
-							Back
-						</button>
-						<h1>Terminal</h1>
-						<button
-							className="secondary-button"
-							onClick={() => setIsFullscreen((p) => !p)}
-							type="button"
-						>
-							{isFullscreen ? "Exit" : "Fullscreen"}
-						</button>
-					</div>
-				)}
-				<TerminalSessionTabs
-					sessions={sessionInfos}
-					activeSessionId={activeSessionId ?? ""}
-					onSelect={handleSelect}
-					onClose={handleClose}
-					onCreate={handleCreate}
-					onRename={handleRename}
-					isMobile={true}
-				/>
+				<div
+					className={`terminal-page-header mobile-header ${headerAutoHide.isVisible ? "visible" : "hidden"}`}
+					onClick={() => headerAutoHide.show()}
+				>
+					<button
+						className="secondary-button"
+						onClick={() => navigate(-1)}
+						type="button"
+					>
+						Back
+					</button>
+					<h1>Terminal</h1>
+					<button
+						className="secondary-button"
+						onClick={() => setIsFullscreen((p) => !p)}
+						type="button"
+					>
+						{isFullscreen ? "Exit" : "Fullscreen"}
+					</button>
+				</div>
+				<div
+					className={`mobile-tabs-container ${headerAutoHide.isVisible ? "visible" : "hidden"}`}
+					onClick={() => headerAutoHide.show()}
+				>
+					<TerminalSessionTabs
+						sessions={sessionInfos}
+						activeSessionId={activeSessionId ?? ""}
+						onSelect={handleSelect}
+						onClose={handleClose}
+						onCreate={handleCreate}
+						onRename={handleRename}
+						isMobile={true}
+					/>
+				</div>
 				<div className="terminal-page-content">
 					{error && <div className="terminal-error-banner">{error}</div>}
 					{sessions.map((session) => (

apps/web/src/styles.css

@@ -2904,6 +2904,25 @@ a.nav-item,
 	opacity: 1;
 }
 
+/* Mobile auto-hide header and tabs */
+.terminal-page.mobile .terminal-page-header,
+.mobile-tabs-container {
+	transition: transform 0.3s ease, opacity 0.3s ease;
+}
+
+.terminal-page.mobile .terminal-page-header.hidden,
+.mobile-tabs-container.hidden {
+	transform: translateY(-100%);
+	opacity: 0;
+	pointer-events: none;
+}
+
+.terminal-page.mobile .terminal-page-header.visible,
+.mobile-tabs-container.visible {
+	transform: translateY(0);
+	opacity: 1;
+}
+
 /* Mobile fullscreen */
 @media (max-width: 767px) {
 	.terminal-page.fullscreen {