* fix(image): allow any quality 1-100 when images.qualities is unset
The image optimization endpoint returned 400 for any quality other than
75 (e.g. `<Image quality={90}>`) because vinext defaulted the allowed
quality list to `[75]` whenever `images.qualities` was not configured.
Next.js only enforces a quality allowlist when `images.qualities` is set;
when unset it permits any integer quality from 1-100. This aligns vinext
with that behaviour: `parseImageParams`/`resolveDevImageRedirect` now take
an optional allowlist and only restrict quality when one is provided, and
the build/runtime plumbing emits `null` (not `[75]`) when unset so the
"allow all" semantics survive into the deploy worker.
Repro: GET /_next/image?url=%2Fshop%2Ftablet.png&w=750&q=90 -> 400.
Fixes the app-router-playground image optimization failure.
* test(image): update App Router blur-exception tests for quality parity
With `images.qualities` unset, any quality 1-100 is now permitted (Next.js
parity), so q=70 is a normal quality rather than a rejected one. Pin the
blur-quality-exception tests to `qualities: [75]` so they still exercise the
dev-only exception, and add a case asserting q=70 is allowed in production
when qualities is unset.
James Anderson
62db98056c