fix: terminal sizing and newline rendering issues

- Add ResizeObserver to terminal container for responsive sizing
  (catches keyboard open/close, header auto-hide, layout changes)
- Remove padding from mobile terminal container to maximize space
- Fix CSS: ensure xterm viewport fills container height properly
- Fix session-card.tsx TypeScript error (removed non-existent port field)
- Remove explicit xterm-viewport/xterm-screen width overrides that
  interfered with xterm.js canvas sizing

apps/web/src/components/session-card.tsx

@@ -110,9 +110,7 @@ export function SessionCard({
               </a>
             </p>
           )}
-          {session.port && session.status === "running" && (
-            <p className="muted session-card-meta">Port: {session.port}</p>
-          )}
+
           {session.created_at && (
             <p className="muted session-card-meta">
               Created: {new Date(session.created_at).toLocaleDateString()}

apps/web/src/components/terminal.tsx

@@ -242,6 +242,25 @@ export const TerminalComponent: React.FC<TerminalProps> = ({
 
     window.addEventListener("resize", handleResize);
 
+    // Watch container size changes (keyboard, header auto-hide, etc.)
+    let resizeObserver: ResizeObserver | null = null;
+    if (terminalRef.current && typeof ResizeObserver !== "undefined") {
+      resizeObserver = new ResizeObserver(() => {
+        fitAddon.fit();
+        const { cols, rows } = term;
+        if (ws.readyState === WebSocket.OPEN) {
+          ws.send(
+            JSON.stringify({
+              type: "resize",
+              cols,
+              rows,
+            })
+          );
+        }
+      });
+      resizeObserver.observe(terminalRef.current);
+    }
+
     // Notify parent about terminal readiness
     if (onTerminalReadyRef.current) {
       const sendData = (data: string) => {
@@ -270,6 +289,9 @@ export const TerminalComponent: React.FC<TerminalProps> = ({
     return () => {
       clearTimeout(resizeTimeout);
       window.removeEventListener("resize", handleResize);
+      if (resizeObserver) {
+        resizeObserver.disconnect();
+      }
       document.removeEventListener("visibilitychange", handleVisibilityChange);
       ws.close();
       term.dispose();