fix: keep the animated-image test fixtures BlobPart-compatible under TypeScript >= 5.7

[AminDhouib]

Unblocks the three npm dependabot PRs (#351, #355, #356), whose rebased lockfiles float typescript 5.6.3 → 5.9.3 and all fail Typecheck the same way.

The defect

PR #365's animated-image test fixtures postdate #368's Uint8Array-generics sweep (which was verified at dev 9b381b8b, before #365 merged) and reintroduce the same pattern: explicit : Uint8Array return annotations, which on TypeScript ≥ 5.7 mean Uint8Array<ArrayBufferLike> — not assignable to BlobPart.

RED, from the live Typecheck failure on #355's rebase (7 errors, all @upupjs/core):

tests/steps/animated-image-detection.test.ts(26,22): error TS2322: Type 'Uint8Array<ArrayBufferLike>' is not assignable to type 'BlobPart'.
tests/steps/image-processing.test.ts(171,13): error TS2345: Argument of type 'Uint8Array<ArrayBufferLike>' is not assignable to parameter of type 'BlobPart | undefined'.
(+ 228, 242, 270, 289, and the ELIFECYCLE exit 2)

The fix (same convention as #368)

• tests/helpers/animated-image-fixtures.ts: dropped the 12 explicit : Uint8Array return annotations — inference from new Uint8Array(number[]) yields the narrow Uint8Array<ArrayBuffer> on TS ≥ 5.7 and plain Uint8Array on ≤ 5.6.
• tests/steps/image-processing.test.ts: the animated table annotation [string, string, Uint8Array][] → [string, string, BlobPart][] (valid on both TS versions; the bytes only ever feed makeUploadFile, whose parameter is BlobPart). Note Uint8Array<ArrayBuffer> syntax was NOT an option — it's a parse error on TS ≤ 5.6.

Test-only; no runtime or published-surface change, so no changeset.

Verification (raw exit codes)

• GREEN under the float: pnpm update -r typescript (lands typescript@5.9.3, same resolution as the dependabot lockfiles; angular held at 5.6.3 by fix: make Blob/BodyInit fixture types and the Angular TS pin survive a lockfile float (#351 unblock) #368's ~5.6.0 pin) → tsc --version prints 5.9.3 → @upupjs/core typecheck (base + tsconfig.test.json) exit 0.
• GREEN under the committed lockfile: scaffolding reverted, pnpm install --frozen-lockfile exit 0, tsc --version prints 5.6.3, core typecheck exit 0.
• Pre-commit hook ran the core suite (337 passed / 41 skipped); pre-push ran full typecheck + lint + knip.
• Touched files are outside packages/*/src (CI-blind for formatting): explicit prettier --check on both — clean.

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