Revert "Use opentui OSC52 clipboard (#11718)"

This reverts commit 8e985e0a75.

packages/opencode/src/cli/cmd/tui/app.tsx

@@ -186,7 +186,6 @@ function App() {
   const route = useRoute()
   const dimensions = useTerminalDimensions()
   const renderer = useRenderer()
-  Clipboard.setRenderer(renderer)
   renderer.disableStdoutInterception()
   const dialog = useDialog()
   const local = useLocal()

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

@@ -1,12 +1,24 @@
 import { $ } from "bun"
-import type { CliRenderer } from "@opentui/core"
 import { platform, release } from "os"
 import clipboardy from "clipboardy"
 import { lazy } from "../../../../util/lazy.js"
 import { tmpdir } from "os"
 import path from "path"
 
-const rendererRef = { current: undefined as CliRenderer | undefined }
+/**
+ * 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 {
@@ -14,10 +26,6 @@ export namespace Clipboard {
     mime: string
   }
 
-  export function setRenderer(renderer: CliRenderer | undefined): void {
-    rendererRef.current = renderer
-  }
-
   export async function read(): Promise<Content | undefined> {
     const os = platform()
 
@@ -146,11 +154,7 @@ export namespace Clipboard {
   })
 
   export async function copy(text: string): Promise<void> {
-    const renderer = rendererRef.current
-    if (renderer) {
-      const copied = renderer.copyToClipboardOSC52(text)
-      if (copied) return
-    }
+    writeOsc52(text)
     await getCopyMethod()(text)
   }
 }