Fix modal popup

src/components/ui/modal.tsx

@@ -0,0 +1,89 @@
+"use client";
+
+import { useEffect, useRef } from "react";
+import { createPortal } from "react-dom";
+
+interface Props {
+  open: boolean;
+  /** Called when user clicks the backdrop or presses Escape. */
+  onClose: () => void;
+  children: React.ReactNode;
+  /**
+   * ARIA label fallback when no labelled element exists inside.
+   * Optional; if you have a heading inside the modal with id, set
+   * `aria-labelledby` on a wrapper instead.
+   */
+  ariaLabel?: string;
+}
+
+/**
+ * Portal-based modal.
+ *
+ * Why a portal
+ * ------------
+ * `position: fixed` becomes positioned relative to a transformed
+ * ancestor's containing block, not the viewport, when ANY ancestor
+ * has a `transform`, `perspective`, or `filter` applied. Our
+ * `animate-in` utility sets `transform: translateY(0)` on a lot of
+ * dashboard/tenant-detail containers (because of the fade-up
+ * animation, which uses `animation-fill-mode: both` to keep the
+ * transform on after the animation finishes). That broke modals
+ * rendered as in-place children — they centred to the panel they
+ * lived in, not to the page.
+ *
+ * Rendering at `document.body` via `createPortal` escapes every
+ * containing-block ancestor and gives us true viewport coordinates.
+ *
+ * UX details
+ * ----------
+ * - Backdrop click triggers `onClose`. (Bubbling check: only fires
+ *   when the click target IS the backdrop, not the panel inside.)
+ * - Escape key triggers `onClose`. Standard modal expectation.
+ * - `body` overflow is locked while open so background content
+ *   doesn't scroll behind the modal.
+ * - Renders nothing on first paint server-side, then mounts on
+ *   client. `useEffect` gating ensures `document.body` is available;
+ *   without it Next.js SSR would throw on `document` reference.
+ */
+export function Modal({ open, onClose, children, ariaLabel }: Props) {
+  const closeRef = useRef(onClose);
+  closeRef.current = onClose;
+
+  useEffect(() => {
+    if (!open) return;
+
+    // Lock background scroll. Restore on unmount/close.
+    const previousOverflow = document.body.style.overflow;
+    document.body.style.overflow = "hidden";
+
+    const onKey = (e: KeyboardEvent) => {
+      if (e.key === "Escape") closeRef.current();
+    };
+    window.addEventListener("keydown", onKey);
+
+    return () => {
+      document.body.style.overflow = previousOverflow;
+      window.removeEventListener("keydown", onKey);
+    };
+  }, [open]);
+
+  if (!open) return null;
+  if (typeof document === "undefined") return null;
+
+  return createPortal(
+    <div
+      role="dialog"
+      aria-modal="true"
+      aria-label={ariaLabel}
+      className="fixed inset-0 z-50 flex items-center justify-center p-4 bg-black/60 backdrop-blur-sm"
+      onClick={(e) => {
+        if (e.target === e.currentTarget) onClose();
+      }}
+    >
+      <div className="bg-surface-1 border border-border rounded-xl p-6 max-w-md w-full max-h-[90vh] overflow-y-auto">
+        {children}
+      </div>
+    </div>,
+    document.body
+  );
+}