fix: render TUI pickers as overlays

src/tui/tui-overlays.ts

@@ -0,0 +1,19 @@
+import type { Component, TUI } from "@mariozechner/pi-tui";
+
+type OverlayHost = Pick<TUI, "showOverlay" | "hideOverlay" | "hasOverlay" | "setFocus">;
+
+export function createOverlayHandlers(host: OverlayHost, fallbackFocus: Component) {
+  const openOverlay = (component: Component) => {
+    host.showOverlay(component);
+  };
+
+  const closeOverlay = () => {
+    if (host.hasOverlay()) {
+      host.hideOverlay();
+      return;
+    }
+    host.setFocus(fallbackFocus);
+  };
+
+  return { openOverlay, closeOverlay };
+}