The once-per-version Clear-Site-Data: "cache" header on the index
navigation raced the page's own CSS/JS subresource loads in the
Telegram WebView, intermittently evicting or aborting the main
stylesheet so the mini app rendered half-styled on mobile.
It also could not fix stale HTML: it only fires when the document
actually reaches the backend, never when the WebView serves a cached
page. The no-store HTML plus immutable content-hashed asset filenames
already guarantee freshness without clearing the cache, so remove the
reset header, its helpers, constants, and tests.
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