Patch Changes

• #17445 a5f7230 Thanks @ocavue! - Updates dependency cookie to v2. Cookie values made entirely of URL-safe characters are no longer percent-encoded in Set-Cookie headers; encoded values round-trip exactly as before.

• #17402 a89c137 Thanks @farrosfr! - Fixes a bug where mutated Astro.locals during the request lifecycle are lost and not passed to custom error pages (404.astro/500.astro)

• #17405 91992ef Thanks @Araluma! - Prevents an unhandled promise rejection from the prefetch fetch fallback. In WebKit (Safari), <link rel="prefetch"> is unsupported, so prefetch uses the fetch() fallback; on a flaky connection that fetch rejects with TypeError: Load failed, and because the promise was not awaited or caught, it surfaced as an unhandled rejection to the page's global error handlers. The best-effort prefetch now swallows the failure with .catch().