feat(chat): prompt facebook users to open external browser

src/app/chat/components/external-browser-dialog.module.css

@@ -0,0 +1,64 @@
+.overlay {
+  position: fixed;
+  inset: 0;
+  z-index: 70;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  padding: var(--spacing-md, 16px);
+  background: rgba(0, 0, 0, 0.5);
+}
+
+.dialog {
+  width: 100%;
+  max-width: 360px;
+  padding: 24px 18px 18px;
+  text-align: center;
+  background: var(--color-page-background, #ffffff);
+  border-radius: 32px;
+  box-shadow: 0 20px 48px rgba(0, 0, 0, 0.22);
+}
+
+.title {
+  margin: 0 0 10px;
+  font-size: var(--font-size-22, 22px);
+  font-weight: 700;
+  line-height: 1.2;
+  color: var(--color-text-foreground, #171717);
+}
+
+.content {
+  margin: 0 12px 22px;
+  font-size: var(--font-size-md, 15px);
+  line-height: 1.5;
+  color: var(--color-text-secondary, #555555);
+  white-space: pre-line;
+}
+
+.actions {
+  display: flex;
+  gap: var(--spacing-md, 12px);
+}
+
+.button {
+  flex: 1 1 auto;
+  height: 44px;
+  border: 0;
+  border-radius: 999px;
+  font-size: var(--font-size-md, 15px);
+  font-weight: 700;
+  cursor: pointer;
+}
+
+.secondary {
+  color: var(--color-text-secondary, #555555);
+  background: #efefef;
+}
+
+.primary {
+  color: #ffffff;
+  background: linear-gradient(
+    var(--color-button-gradient-start, #ff67e0),
+    var(--color-button-gradient-end, #ff52a2)
+  );
+}

src/app/chat/components/external-browser-dialog.tsx

@@ -0,0 +1,52 @@
+"use client";
+
+import styles from "./external-browser-dialog.module.css";
+
+export interface ExternalBrowserDialogProps {
+  open: boolean;
+  onClose: () => void;
+  onConfirm: () => void;
+}
+
+export function ExternalBrowserDialog({
+  open,
+  onClose,
+  onConfirm,
+}: ExternalBrowserDialogProps) {
+  if (!open) return null;
+
+  return (
+    <div
+      className={styles.overlay}
+      role="dialog"
+      aria-modal="true"
+      aria-labelledby="external-browser-title"
+    >
+      <div className={styles.dialog}>
+        <h2 id="external-browser-title" className={styles.title}>
+          Open in browser
+        </h2>
+        <p className={styles.content}>
+          Sync your Facebook profile to an external browser{"\n"}
+          for the best chat experience.
+        </p>
+        <div className={styles.actions}>
+          <button
+            type="button"
+            className={`${styles.button} ${styles.secondary}`}
+            onClick={onClose}
+          >
+            Later
+          </button>
+          <button
+            type="button"
+            className={`${styles.button} ${styles.primary}`}
+            onClick={onConfirm}
+          >
+            Continue
+          </button>
+        </div>
+      </div>
+    </div>
+  );
+}

src/app/chat/components/index.ts

@@ -11,6 +11,7 @@ export * from "./chat-input-text-field";
 export * from "./chat-quota-exhausted-banner";
 export * from "./chat-send-button";
 export * from "./date-header";
+export * from "./external-browser-dialog";
 export * from "./fullscreen-image-viewer";
 export * from "./image-bubble";
 export * from "./language-dialog";