Admins can upload custom mobile/desktop screenshots shown in the browser's
PWA install dialog, replacing the hardcoded Bulwark ones. Two new config keys
(pwaScreenshotMobileUrl/DesktopUrl), upload widgets in the admin Branding tab,
a sharp-based /api/pwa-screenshot/[variant] resize route, and manifest.ts picks
the custom screenshots when configured.
Like the other branding fields, screenshots are per-domain: they are
BRANDING_OVERRIDE_KEYS, the manifest and the /api/pwa-screenshot route resolve
them from the request host (domain override -> global -> Bulwark default), and
the admin Branding tab + upload/delete route handle them in a per-domain scope,
mirroring pwaIconUrl/faviconUrl.
Upstream 1.7.2 prefixes most hand-written URLs with basePath via apiFetch /
withBasePath, but four subpath-relevant spots were missed:
- host-bridge: the sandbox iframe src was a bare "/plugin-sandbox" -> 404
under NEXT_PUBLIC_BASE_PATH, breaking all plugins. Wrap in withBasePath.
- host-api doHttpPost: the same-origin /api/* plugin proxy used raw fetch on
url.pathname -> 404 under a subpath. Route it through apiFetch.
- admin branding preview <img>: unprefixed src -> broken thumbnail.
- (sandbox) layout: drop the Geist font + globals.css imports. The sandbox
runs with an opaque origin, so those assets are CORS-blocked; the plugin
bundle and all host API calls travel over the postMessage bridge, so no
same-origin asset fetch happens there.
