fix(terminal): wire OSC 52 clipboard, increase resize cap, fix hardcoded height

- Register OSC 52 handler in DirectTerminal to decode base64 clipboard
  data from tmux and write it to the system clipboard
- Increase resize maxAttempts from 10 to 60 so fullscreen toggle works
  on slow machines with CSS transitions >166ms
- Replace hardcoded h-[600px] in Terminal.tsx with responsive
  max(440px, calc(100vh - 440px)) to prevent overflow on small screens

Closes #237

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

packages/web/src/components/DirectTerminal.tsx

@@ -148,6 +148,20 @@ export function DirectTerminal({
           },
         );
 
+        // Register OSC 52 handler for clipboard support
+        // tmux sends OSC 52 with base64-encoded text when copying
+        terminal.parser.registerOscHandler(52, (data) => {
+          const parts = data.split(";");
+          if (parts.length < 2) return false;
+          const b64 = parts[parts.length - 1];
+          try {
+            navigator.clipboard?.writeText(atob(b64)).catch(() => {});
+          } catch {
+            // Ignore decode errors
+          }
+          return true;
+        });
+
         // Open terminal in DOM
         terminal.open(terminalRef.current);
         terminalInstance.current = terminal;
@@ -257,7 +271,7 @@ export function DirectTerminal({
     }
 
     let resizeAttempts = 0;
-    const maxAttempts = 10;
+    const maxAttempts = 60;
 
     const resizeTerminal = () => {
       resizeAttempts++;

packages/web/src/components/Terminal.tsx

@@ -73,7 +73,7 @@ export function Terminal({ sessionId }: TerminalProps) {
           {fullscreen ? "exit fullscreen" : "fullscreen"}
         </button>
       </div>
-      <div className={cn("w-full", fullscreen ? "h-[calc(100vh-40px)]" : "h-[600px]")}>
+      <div className="w-full" style={{ height: fullscreen ? "calc(100vh - 40px)" : "max(440px, calc(100vh - 440px))" }}>
         {terminalUrl ? (
           <iframe
             src={terminalUrl}