Fix embedded terminal for Claude Code: PTY env, DEC 2026, xterm.js window queriesHEADv0.2.4main

- Add missing PTY environment variables (TERM, COLORTERM, LANG, TERM_PROGRAM)
- Strip DEC 2026 synchronized output sequences that cause xterm.js to buffer
  indefinitely when begin/end markers are split across PTY chunks
- Enable xterm.js windowOptions for terminal pixel/char size queries that
  Claude Code sends to determine rendering capabilities
- Launch Claude tab via login shell for full PATH inheritance

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

3 files changed, 21 insertions, 5 deletions

diff --git a/package.json b/package.json
index 4b108e8..99d5ed7 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "lattex",
-  "version": "0.2.3",
+  "version": "0.2.4",
   "description": "LaTeX editor with real-time Overleaf sync",
   "license": "AGPL-3.0",
   "author": "Yuren Hao",
diff --git a/src/main/index.ts b/src/main/index.ts
index d4d9b2d..96a225c 100644
--- a/src/main/index.ts
+++ b/src/main/index.ts
@@ -100,18 +100,28 @@ ipcMain.handle('pty:spawn', async (_e, id: string, cwd: string, cmd?: string, ar
 
   const shellPath = cmd || process.env.SHELL || '/bin/zsh'
   const shellArgs = args || ['-l']
+  const ptyEnv: Record<string, string> = {
+    ...(process.env as Record<string, string>),
+    TERM: 'xterm-256color',
+    COLORTERM: 'truecolor',
+    TERM_PROGRAM: 'LatteX',
+    LANG: process.env.LANG || 'en_US.UTF-8',
+  }
   const instance = pty.spawn(shellPath, shellArgs, {
     name: 'xterm-256color',
     cols: 80,
     rows: 24,
     cwd,
-    env: process.env as Record<string, string>
+    env: ptyEnv
   })
 
   ptyInstances.set(id, instance)
 
   instance.onData((data) => {
-    sendToRenderer(`pty:data:${id}`, data)
+    // Strip DEC 2026 synchronized output sequences — xterm.js may buffer indefinitely
+    // if the begin/end markers are split across PTY chunks
+    const cleaned = data.replace(/\x1b\[\?2026[hl]/g, '')
+    if (cleaned) sendToRenderer(`pty:data:${id}`, cleaned)
   })
 
   instance.onExit(() => {
diff --git a/src/renderer/src/components/Terminal.tsx b/src/renderer/src/components/Terminal.tsx
index 9a2e24c..72f785f 100644
--- a/src/renderer/src/components/Terminal.tsx
+++ b/src/renderer/src/components/Terminal.tsx
@@ -53,7 +53,13 @@ function TerminalInstance({ id, cwd, cmd, args, visible }: {
       fontFamily: '"SF Mono", "Fira Code", "JetBrains Mono", monospace',
       fontSize: 13,
       cursorBlink: true,
-      scrollback: 10000
+      scrollback: 10000,
+      windowOptions: {
+        getWinSizePixels: true,
+        getCellSizePixels: true,
+        getWinSizeChars: true,
+        getWinPosition: true,
+      }
     })
 
     const fitAddon = new FitAddon()
@@ -149,7 +155,7 @@ export default function Terminal() {
 
       <TerminalInstance id="terminal" cwd={syncDir} visible={mode === 'terminal'} />
       {claudeSpawned && (
-        <TerminalInstance id="claude" cwd={syncDir} cmd="claude" args={[]} visible={mode === 'claude'} />
+        <TerminalInstance id="claude" cwd={syncDir} args={['-l', '-c', 'claude']} visible={mode === 'claude'} />
       )}
     </div>
   )