feat(frontend): align report edit with the Razor wizard

[Seme30]

Part of #789.

Problem

Report edit does not read as the same product. Razor is a six-step wizard. Next.js is a single form.

Current gaps

On /reports/edit?id=16 (Daily Emergency Department Census):

• Razor steps: Cancel, Description, Meta, Images, Maintenance, Complete. Description uses rich-text editors for description and key assumptions.
• Next.js is one page: GitLab project URL, developer description, key assumptions, developer notes, executive visibility, hidden, terms, collections, image upload.
• Seeded description and key assumptions do load on both. Do not save during comparison.

Frontend / Razor references

• frontend/app/reports/edit/page.tsx
• web/Pages/Reports/Edit.cshtml

Definition of done

• Next.js report edit presents the same steps or an equivalent flow that still covers Description, Meta, Images, and Maintenance.
• Seeded fields that Razor shows are present and loaded.
• Typecheck, lint, and frontend tests cover the edit shell.