refactor(scan): remove legacy discovery preview

[jasonhedman]

Summary

• replace the legacy registration-grade docs tester with the compact MPPscan discovery result pattern
• delete the 1,839-line discovery preview panel, its dummy data, and its compatibility export surface
• keep only the discovery, probing, and registration result states used by the production registration page and move them to the nearest route owner
• remove orphaned ownership, registered-resource, retry, and refresh client plumbing plus the two unused tRPC procedures it kept alive
• adopt Foundation primitives and semantic typography/color recipes throughout the remaining registration surface

Lint impact

• legacy discovery panel: 225 diagnostics removed with the file
• registration UI and discovery hooks: 0 diagnostics under the currently exposed Foundation/Oxlint rules
• repository total: 2,595 warnings before this cleanup, 2,319 after (276 removed); 0 errors
• no new lint exceptions or suppressions

Validation

• pnpm check
• pnpm --filter @x402scan/app build
• browser verified /resources/register in light and dark themes
• live discovery against x402scan.com returned 14 decoded resources and enabled registration without submitting a mutation

[vercel]

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Project	Deployment	Actions	Updated
x402scan	Ready	Preview	Sep 4, 2026 5:47pm UTC