Name each install, fix the notification badge, switch to Archivo

- Settings > General: an App name (super admin) for the installed app.
  The manifest's name/short_name, the iOS head tags and the loading
  page's title use it, so two installs on one phone can be told apart.
- Notifications get a real badge (white stone silhouette): Android masks
  the badge by alpha, so the opaque app icon showed as a square.
- The loading and offline pages load the app's font.
- The font is now Archivo (variable, one request for every weight),
  matching the marketing site.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

src/functions/backend/db/app-settings/grab-install-name.ts

@@ -0,0 +1,12 @@
+import { PwaInstallNameSettingKey } from "@/src/data/pwa-data";
+import grabAppSetting from "./grab-app-setting";
+
+/**
+ * The name this install was given in Settings > General, or empty when it
+ * was never named (`installDisplayName` falls back to `SiteName`).
+ */
+export default async function grabInstallName() {
+    const saved = await grabAppSetting({ key: PwaInstallNameSettingKey });
+
+    return saved?.trim() || "";
+}