[Alexander-Mitrofanov]

Summary

• migrate every catalog example from legacy URL parameter data to the versioned Store/Load JSON session schema
• load examples through the shared JSON decoder while preserving defaults, sharing, geometry, and annotations
• replace the All feature showcase with the supplied session, including sequence names and 15 positioned text annotations
• update unit and browser regressions to consume the shared session format

Validation

• npm run test:architecture
• npm run test:ci (537 tests)
• npm run test:package
• npm run test:browser
• npm run test:ui
• npm run test:pages
• npm run test:visual (zero changed pixels across all five geometry fixtures)

Dependency

This PR is stacked on #111 so its diff remains limited to issue #110 while reusing the already-open arrow-button browser selector correction. It can be retargeted to main after #111 merges.

Closes #110