fix(tui): check for selected text instead of any selection in dialog escape handler (#16779)

packages/opencode/src/cli/cmd/tui/ui/dialog.tsx

@@ -70,7 +70,7 @@ function init() {
   useKeyboard((evt) => {
     if (store.stack.length === 0) return
     if (evt.defaultPrevented) return
-    if ((evt.name === "escape" || (evt.ctrl && evt.name === "c")) && renderer.getSelection()) return
+    if ((evt.name === "escape" || (evt.ctrl && evt.name === "c")) && renderer.getSelection()?.getSelectedText()) return
     if (evt.name === "escape" || (evt.ctrl && evt.name === "c")) {
       const current = store.stack.at(-1)!
       current.onClose?.()