Previously isCalendarMimeType was a module-private function in
lib/calendar-invitation.ts. Exporting it allows the email viewer
to reuse the same MIME type detection logic when filtering out
calendar attachments, avoiding duplication of the type set.
Reorganize the Branding section with subsections (App identity, Icons &
favicon, PWA appearance, Logos, Login page) and document the new variables
APP_SHORT_NAME, APP_DESCRIPTION, PWA_ICON_URL, PWA_THEME_COLOR and
PWA_BACKGROUND_COLOR.
- Add app/manifest.ts to serve /manifest.webmanifest dynamically at runtime
- Name, short_name, description, theme_color and background_color are read
from env vars (APP_NAME, APP_SHORT_NAME, APP_DESCRIPTION, PWA_THEME_COLOR,
PWA_BACKGROUND_COLOR) with Bulwark defaults as fallback
- Add /api/pwa-icon/[size] route that auto-generates 192x192 and 512x512 PNG
icons from PWA_ICON_URL (or FAVICON_URL as fallback) using Sharp; results
are cached in memory
- Remove static manifest: '/manifest.json' from layout metadata; Next.js
injects the link automatically from app/manifest.ts
- Fix pre-existing ESLint no-undef on RequestInit in browser-navigation.ts
