test(api validation): check query validation boundaries for ?accent= parameter (Variation 4)

[boss477]

Description

Fixes #1458

This PR adds unit tests and route integration tests to verify validation boundaries for the ?accent= query parameter when passing an invalid color hex value like #ZZZZZZ.

Pillar

• 🎨 Pillar 1 — New Theme Design
• 📐 Pillar 2 — Geometric SVG Improvement
• 🕐 Pillar 3 — Timezone Logic Optimization
• 🛠️ Other (Bug fix, refactoring, docs)

Visual Preview

None (Validation changes)

Checklist before requesting a review:

• I have read the CONTRIBUTING.md file.
• I have tested these changes locally.
• I have run npm run format and npm run lint locally and resolved all errors.
• My commits follow the Conventional Commits format.
• I have updated README.md if I added a new theme or URL parameter.
• I have started the repo.
• I have made sure that i have only one commit to merge in this PR.
• The SVG output matches the CommitPulse "premium quality" aesthetic standard.

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[Aamod007]

Adds the missing expect(response.status).toBe(400) to the existing #ZZZZZZZ route test (which was a no-op) and adds the complementary #ZZZZZZ (6-char, all non-hex) boundary test at both the schema and route layers. 220/220 tests pass. Clean and focused.

[github-actions]

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