Improve dark-theme contract verification contrast

[crossagent-production-app]

Related to #20.

Summary

• Improves dark-theme contrast for the EVM contract verification form labels, select values, placeholders, radio states, and action buttons.
• Scopes the contrast overrides to the contract verification form.

Verification

• npm run lint passed with existing unrelated warnings.
• npx prettier './src/components/contract/verify.tsx' './src/styles/globals.css' --check passed.
• node -e '<mocked Heima contract page validation>' # playwright validation passed and captured /tmp/crossagent-issue-20-final-ui.png.

Delivery Evidence Summary

Change:

• Scoped dark-theme contrast overrides to the EVM contract verification form.
• Made Compiler Type, Include nightly builds, select values, placeholders, radio states, Verify Guide, and Reset readable on the dark panel.

Objective Evidence:

• npm run lint passed with existing unrelated warnings in Footer.test.tsx and sub/account/[id].tsx.
• npx prettier './src/components/contract/verify.tsx' './src/styles/globals.css' --check passed.
• node -e '<mocked Heima contract page validation>' # playwright validation passed; it loaded /contract/0x1ac62f1c2d828476a5d784e850a700dc1f17e0be, selected Single file mode, asserted required controls, checked 15.64:1 contrast on key labels/buttons, and wrote /tmp/crossagent-issue-20-final-ui.png.

Visual Evidence:

• 

Reviewer:

• @repo Intake Reviewer

Risks / Not Covered:

• Protected Heima preview URL requires Vercel authentication, so browser validation used local Next.js with mocked API responses for the same unverified contract route.
• Existing app console warnings for unlabeled HeroUI controls and Next head script remain outside this contrast-only fix.

[vercel]

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Project	Deployment	Actions	Updated (UTC)
subscan-essentials	Ready	Preview, Comment	May 22, 2026 8:00am
subscan-essentials-ui-react	Ready	Preview, Comment	May 22, 2026 8:00am

[YoshiyukiSakura]

Temporary image host for CrossAgent formal evidence upload. Formal delivery evidence must be published by the CrossAgent GitHub App separately.\n\n

[crossagent-production-app]

Delivery Evidence Summary

Change:

• Scoped dark-theme contrast overrides to the EVM contract verification form.
• Improved readability for Compiler Type, Include nightly builds, select values, placeholders, radio states, Verify Guide, and Reset on the dark panel.

Objective Evidence:

• npm run lint exit code 0, passed: Next lint completed; remaining warnings are pre-existing in Footer.test.tsx and sub/account/[id].tsx.
• npx prettier './src/components/contract/verify.tsx' './src/styles/globals.css' --check exit code 0, passed: Touched files match repository formatting.
• node - <<'NODE' ... NODE # playwright e2e final screenshot validation exit code 0, passed: Browser validation loaded the contract route in dark mode with mocked Heima API data, selected Single file mode, asserted the required verification controls, and captured the final UI state.

Visual Evidence:

• 
• Final dark-theme contract verification form after the Playwright E2E validation.

Reviewer:

• @repo Intake Reviewer

Risks / Not Covered:

• Authentication-gated Heima preview access was mirrored with local Next.js and mocked API responses for the same unverified contract route.
• Existing app console warnings for unlabeled HeroUI controls and Next head script usage remain outside this contrast-only change.

Generated at: 2026-05-22T08:10:06.092Z

[crossagent-production-app]

Completion-check Playwright E2E Evidence

Objective Evidence:

• npm exec playwright -- screenshot --browser chromium --wait-for-timeout 12000 http://localhost:3020/contract/0x1ac62f1c2d828476a5d784e850a700dc1f17e0be /tmp/subscan-essentials-contract-e2e.png exit code 0, passed: direct Playwright browser validation opened the local contract route and captured a nonblank rendered page.
• git restore -- ui-react/public/__ENV.js && git status --short exit code 0, passed: dev-server generated ui-react/public/__ENV.js was restored and the worktree is clean.

Visual Evidence:

subscan-essentials-contract-e2e.png

Known Risks:

• Live contract route returned the app empty-result state without mocked API data; PR Improve dark-theme contract verification contrast #23 already contains the mocked final verification-form screenshot for the contrast-specific UI state.