LF-5380: Add certifications section to market directory

[SayakaOno]

Description

Adds a read-only "Certifications" card to the Market Directory profile page (/farm_settings/market_directory.

• MarketDirectoryCertifications (new component)
  • Filters certifications to only those that are actually publishable (active and not expired; Pursuing and Expired are excluded entirely).
  • Shows CertificationsEmptyState when there are none, or a list of CertificationCards (edit icon only, no delete) when there are — clicking edit navigates to /certifications/:id/edit_certification, and the empty state's CTA navigates to /certifications/add_certification.
• MarketDirectory/index.tsx
  • Registers Certifications as a new FormCards entry alongside Info. It's always reported as "complete" — certifications are optional and never block the consent/publish flow.
  • Fetches the farm's certifications, system types and certifiers
• CertificationsEmptyState
  • Added an optional className prop.

Jira link: https://lite-farm.atlassian.net/browse/LF-5380

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

• Passes test case
• UI components visually reviewed on desktop view
• UI components visually reviewed on mobile view
• Other (please explain)

Checklist:

• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• The precommit and linting ran successfully
• I have added or updated language tags for text that's part of the UI
• I have ordered translation keys alphabetically (optional: run pnpm i18n to help with this)
• I have added the GNU General Public License to all new files

[SayakaOno]

Merged without review since we only have one dev this week.