chore: add pi cache dirs to .gitignore and mobile terminal styles

.gitignore

@@ -49,3 +49,10 @@ apps/web/dist/
 .DS_Store
 Thumbs.db
 /.stoneforge/.worktrees/
+
+# Pi / agent cache
+.pi/
+.atl/
+.sisyphus/
+.pi-lens/
+

apps/web/src/pages/terminal.tsx

@@ -190,10 +190,16 @@ export const TerminalPage: React.FC = () => {
 
 	if (isMobile) {
 		return (
-			<section className={`terminal-page mobile ${isFullscreen ? "fullscreen" : ""}`}>
+			<section
+				className={`terminal-page mobile ${isFullscreen ? "fullscreen" : ""}`}
+			>
 				{!isFullscreen && (
 					<div className="terminal-page-header mobile-header">
-						<button className="secondary-button" onClick={() => navigate(-1)} type="button">
+						<button
+							className="secondary-button"
+							onClick={() => navigate(-1)}
+							type="button"
+						>
 							Back
 						</button>
 						<h1>Terminal</h1>
@@ -245,9 +251,7 @@ export const TerminalPage: React.FC = () => {
 	}
 
 	return (
-		<section
+		<section className={`terminal-page ${isFullscreen ? "fullscreen" : ""}`}>
-			className={`terminal-page ${isFullscreen ? "fullscreen" : ""}`}
-		>
 			{!isFullscreen && (
 				<div className="terminal-page-header">
 					<button
@@ -278,16 +282,13 @@ export const TerminalPage: React.FC = () => {
 				isMobile={false}
 			/>
 			<div className="terminal-page-content">
-				{error && (
+				{error && <div className="terminal-error-banner">{error}</div>}
-					<div className="terminal-error-banner">{error}</div>
-				)}
 				{sessions.map((session) => (
 					<div
 						key={session.id}
 						className={`terminal-instance ${session.id === activeSessionId ? "active" : ""}`}
 						style={{
-							display:
+							display: session.id === activeSessionId ? "flex" : "none",
-								session.id === activeSessionId ? "flex" : "none",
 						}}
 					>
 						<TerminalComponent