The lazy-loaded admin CSS/JS resolved to bare runtime names served
no-store, the same scheme that left the main bundle vulnerable to stale
CSS in iOS WebViews after a deploy. The original reason for keeping them
bare (hashed admin files could 404 when nginx fronts aiohttp) no longer
holds: the backend image now carries the same deterministically hashed
assets nginx serves, and the App.svelte loader already falls back to the
bare name if a hashed asset ever 404s.
Resolve the admin assets through the same hashed/version-stable path as
the main bundle so they are emitted as immutable, cache-busting URLs.
Also drop the inert <meta http-equiv="Cache-Control/Pragma/Expires">
tags from the shell: browsers ignore http-equiv caching directives for
the document and use the real HTTP headers, which are already set.
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