fix(cli): handle OSC52 clipboard passthrough properly under GNU screen

packages/opencode/src/cli/cmd/tui/util/clipboard.ts

@@ -37,10 +37,35 @@ const getClipboardy = lazy(async () => {
 function writeOsc52(text: string): void {
   if (!process.stdout.isTTY) return
   const base64 = Buffer.from(text).toString("base64")
+
+  if (process.env["TMUX"]) {
+    const osc52 = `\x1b]52;c;${base64}\x07`
+    process.stdout.write(`\x1bPtmux;\x1b${osc52}\x1b\\`)
+    return
+  }
+
+  if (process.env["STY"]) {
+    // Screen's DCS passthrough buffer is limited to MAXSTR = 768 bytes.
+    // The \x1b]52;c; prefix takes 8 bytes, leaving 759 for the first chunk.
+    // Subsequent chunks have no prefix and tolerate up to 767 bytes.
+    // Use 700-byte chunks for a safe margin, joining with \x1b\\\x1bP
+    // to terminate and restart the DCS passthrough. The terminal
+    // accumulates the partial OSC stream until the final \x07.
+    const chunkSize = 700
+    let sequence = `\x1bP\x1b]52;c;`
+
+    for (let i = 0; i < base64.length; i += chunkSize) {
+      if (i > 0) sequence += `\x1b\\\x1bP`
+      sequence += base64.slice(i, i + chunkSize)
+    }
+
+    sequence += `\x07\x1b\\`
+    process.stdout.write(sequence)
+    return
+  }
+
   const osc52 = `\x1b]52;c;${base64}\x07`
-  const passthrough = process.env["TMUX"] || process.env["STY"]
-  const sequence = passthrough ? `\x1bPtmux;\x1b${osc52}\x1b\\` : osc52
-  process.stdout.write(sequence)
+  process.stdout.write(osc52)
 }
 
 export interface Content {