chore: remove remaining Geist-Bold references and complete semibold migration

[georgewrmarshall]

Description

Complete the semibold migration by removing remaining Geist-Bold/Geist-BoldItalic references that were intentionally left out of PR #28363 to keep scope and codeowner review manageable.

Scenario (for user stories only)

• GIVEN typography has migrated semantic bold from 700 to 600
• WHEN app surfaces still reference Geist-Bold directly
• THEN those surfaces should be updated to semibold equivalents so typography behavior is consistent across the app

Design (for user stories only)

N/A (migration aligns with existing Design System typography semantics).

Technical Details (for technical tasks only)

• Search for remaining static Geist-Bold and Geist-BoldItalic references across app code.
• Update references to semibold equivalents where appropriate (Geist-SemiBold, Geist-SemiBoldItalic, or semantic text mappings).
• Remove obsolete bold font assets only after references are fully removed.
• Update platform/config registration as needed:
  • app.config.js (expo-font)
  • native asset manifests
  • iOS UIAppFonts / Xcode resource entries
• Update affected snapshots and coordinate required codeowner reviews for non-DS-owned areas.

Threat Modeling Framework (for technical tasks only)

• What are we working on? What does this aim to solve?
  • Final cleanup of typography migration from bold(700) to semibold(600).
• What can go wrong?
  • Missing font registration can cause runtime fallback to system fonts.
  • Broad snapshot churn can hide unintended visual changes.
• What are we going to do about it?
  • Keep platform registrations in sync and verify in native + Expo runtimes.
  • Limit and review snapshot updates carefully.
• Did we do a good job?
  • All remaining bold references are removed, visual parity is validated, and CI passes without dirty-tree/build regressions.

Acceptance Criteria

• No remaining static Geist-Bold / Geist-BoldItalic references in app code and config where semibold should be used.
• Obsolete bold asset registrations are removed only after reference cleanup is complete.
• Snapshot updates are intentional and reviewed.
• Required codeowner reviews are obtained for touched non-DS-owned files.
• iOS and Android typography renders correctly in native builds.

Stakeholder Review (for MetaMask employees only)

• Engineering (needed in most cases)
• Design
• Product
• QA (automation tests are required to pass before merging PRs but not all changes are covered by automation tests - please review if QA is needed beyond automation tests)
• Security
• Legal
• Marketing
• Management (please specify)
• Other (please specify)

References

• PR scope/tradeoff context: chore: upgrade design system packages and migrate bold to semibold #28363
• Design system migration context: https://github.com/MetaMask/metamask-design-system/releases/tag/v27.0.0