fix:All issue

[Gadflyxx]

Summary

Closes #

Changes

Testing & QA

• npm run check:editorconfig passes
• npm run typecheck (tsc --noEmit) passes cleanly
• npm test and npm run test:coverage pass
• npm run build passes
• Verified on local / staging environment with seeded data (where applicable)

Preview

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Checklist

• Self-reviewed the diff
• Formatting adheres to .editorconfig
• Added or updated tests for new behaviour
• No secrets or credentials committed (used .env.example / .env.staging.example templates)
• PR title follows conventional commits (feat:, fix:, chore:, etc.)
  closes Turn the network-mismatch warning into a hard submission guard with explicit passphrase handling #248
  closes Add client-side throttling against signature-request and submission spam #249
  closes Wire Playwright end-to-end tests into the CI pipeline #250
  closes Add Storybook build and accessibility test-runner checks to CI #251

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