fix: centralize OSC 52 clipboard support for SSH sessions (#8974)

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

@@ -5,6 +5,21 @@ import { lazy } from "../../../../util/lazy.js"
 import { tmpdir } from "os"
 import path from "path"
 
+/**
+ * Writes text to clipboard via OSC 52 escape sequence.
+ * This allows clipboard operations to work over SSH by having
+ * the terminal emulator handle the clipboard locally.
+ */
+function writeOsc52(text: string): void {
+  if (!process.stdout.isTTY) return
+  const base64 = Buffer.from(text).toString("base64")
+  const osc52 = `\x1b]52;c;${base64}\x07`
+  // tmux and screen require DCS passthrough wrapping
+  const passthrough = process.env["TMUX"] || process.env["STY"]
+  const sequence = passthrough ? `\x1bPtmux;\x1b${osc52}\x1b\\` : osc52
+  process.stdout.write(sequence)
+}
+
 export namespace Clipboard {
   export interface Content {
     data: string
@@ -123,6 +138,7 @@ export namespace Clipboard {
   })
 
   export async function copy(text: string): Promise<void> {
+    writeOsc52(text)
     await getCopyMethod()(text)
   }
 }