feat(CN-476): add category param filter to llm platform discover section

[marcotoniut-ledger]

✅ Checklist

• npx changeset was attached.
• Covered by automatic tests.
• Impact of the changes:
  • MOBILE ONLY: ledgerlive://discover?restaking should load discover section with "Restaking" tagged platforms pre-filtered.
  • Other categories should filter by those categories invalid category does not return any results

📝 Description

Add discover section deep link initial category filter to enable links like ledgerlive://discover?category=restaking to load the discover section with an initial category pre-selected.

This is required for the new "restaking" banner on earn dashboard.

Routes with a discover platform app id will not be impacted.

❓ Context

• JIRA or GitHub link: JIRA-CN-476

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🧐 Checklist for the PR Reviewers

• The code aligns with the requirements described in the linked JIRA or GitHub issue.
• The PR description clearly documents the changes made and explains any technical trade-offs or design decisions.
• There are no undocumented trade-offs, technical debt, or maintainability issues.
• The PR has been tested thoroughly, and any potential edge cases have been considered and handled.
• Any new dependencies have been justified and documented.
• Performance considerations have been taken into account. (changes have been profiled or benchmarked if necessary)

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[Justkant]

LGTM but you might want to sync with the merge of this PR as you have almost the same modifications as this PR: #7565

[marcotoniut-ledger]

@Justkant would you say its safe to merge this?

[Justkant]

@Justkant would you say its safe to merge this?

Yes that's why I approved 😄