refactor(guest): retire legacy guest app and move shared modules

resources/js/shared/guest/lib/badges.ts

@@ -0,0 +1,46 @@
+type BadgingNavigator = Navigator & {
+  setAppBadge?: (contents?: number) => Promise<void> | void;
+  clearAppBadge?: () => Promise<void> | void;
+};
+
+function getNavigator(): BadgingNavigator | null {
+  if (typeof navigator === 'undefined') {
+    return null;
+  }
+  return navigator as BadgingNavigator;
+}
+
+export function supportsBadging(): boolean {
+  const nav = getNavigator();
+  return Boolean(nav && (typeof nav.setAppBadge === 'function' || typeof nav.clearAppBadge === 'function'));
+}
+
+export async function updateAppBadge(count: number): Promise<void> {
+  const nav = getNavigator();
+  if (!nav) {
+    return;
+  }
+
+  const safeCount = Number.isFinite(count) ? Math.max(0, Math.floor(count)) : 0;
+  if (!supportsBadging()) {
+    return;
+  }
+
+  try {
+    if (safeCount > 0 && nav.setAppBadge) {
+      await nav.setAppBadge(safeCount);
+      return;
+    }
+
+    if (nav.clearAppBadge) {
+      await nav.clearAppBadge();
+      return;
+    }
+
+    if (nav.setAppBadge) {
+      await nav.setAppBadge(0);
+    }
+  } catch (error) {
+    console.warn('Updating app badge failed', error);
+  }
+}