fix(tui): settle tmux clipboard load on child exit

Mark the write-only tmux load-buffer call as resolve-on-exit so a daemonized tmux server cannot retain inherited stdio and force a false timeout after the direct child has succeeded.

Completes the call-site acceptance item from #93134 as a companion to #93148.

Co-authored-by: JoaoMarcos44 <87440198+JoaoMarcos44@users.noreply.github.com>

ui-tui/packages/hermes-ink/src/ink/termio/osc.ts

@@ -201,7 +201,10 @@ export async function tmuxLoadBuffer(text: string): Promise<boolean> {
   const { code } = await execFileNoThrow('tmux', args, {
     input: text,
     useCwd: false,
-    timeout: 2000
+    timeout: 2000,
+    // tmux may daemonize a server while retaining the inherited stdio pipes;
+    // only the child exit code is needed for this call site.
+    resolveOnExit: true
   })
 
   return code === 0