Fix local shell: fit before sending shell request to companion

터미널 패널이 닫힌 상태에서 로컬 셸을 열면 레이아웃 계산 전에
fitAddon.fit()이 실행돼 rows=0/cols=0으로 companion에 전달됨.
300ms 타임아웃 안에서 fit을 재실행하고 최솟값(24x80) 보장.

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

web-ui/code.js

@@ -759,7 +759,10 @@ function addLocalShell() {
   setTimeout(() => {
     const shell = codeTermShells.find(s => s.id === id);
     if (companionConnected && companionWs && shell?.term) {
-      companionWs.send(JSON.stringify({ type: 'shell', rows: shell.term.rows, cols: shell.term.cols }));
+      if (shell.fitAddon) shell.fitAddon.fit();
+      const rows = shell.term.rows > 0 ? shell.term.rows : 24;
+      const cols = shell.term.cols > 0 ? shell.term.cols : 80;
+      companionWs.send(JSON.stringify({ type: 'shell', rows, cols }));
     }
   }, 300);
 }