feat: p hase 3 of tailwind migration

assets/js/bridges/titlebar_overlay.js

@@ -0,0 +1,39 @@
+export const syncTitlebarOverlayInsets = () => {
+  const rootStyle = document.documentElement.style;
+  const setInsets = (left, right) => {
+    rootStyle.setProperty("--bds-titlebar-overlay-left", `${left}px`);
+    rootStyle.setProperty("--bds-titlebar-overlay-right", `${right}px`);
+  };
+
+  const overlay = navigator.windowControlsOverlay;
+
+  if (!overlay) {
+    setInsets(0, 0);
+    return () => {};
+  }
+
+  const updateInsets = () => {
+    if (!overlay.visible) {
+      setInsets(0, 0);
+      return;
+    }
+
+    const titlebarRect = overlay.getTitlebarAreaRect();
+    const viewportWidth = window.innerWidth || document.documentElement.clientWidth || titlebarRect.right;
+    const leftInset = Math.max(0, Math.round(titlebarRect.left));
+    const rightInset = Math.max(0, Math.round(viewportWidth - titlebarRect.right));
+    setInsets(leftInset, rightInset);
+  };
+
+  const onGeometryChange = () => updateInsets();
+  const onResize = () => updateInsets();
+
+  updateInsets();
+  overlay.addEventListener("geometrychange", onGeometryChange);
+  window.addEventListener("resize", onResize);
+
+  return () => {
+    overlay.removeEventListener("geometrychange", onGeometryChange);
+    window.removeEventListener("resize", onResize);
+  };
+};