[antonreshetov]

Summary

• add strict integer opacity contract from 0 to 100 for Block, Row, Cell and all atoms
• wire typed inspector controls, canonical sanitization and JSON round-trip
• apply opacity to exact preview and email export owners with Outlook opaque fallback policy
• keep selection overlays visible and compensate sibling branches during inline text editing
• extend catalog tooling schema parity

Verification

• pnpm -s vue-tsc --noEmit
• pnpm -s vitest run (135 tests)
• pre-commit formatter and ESLint
• card-catalog-tools typecheck and 17 tests
• catalog check: 78 presets
• browser smoke for Block, Row, Cell and atoms at 0/50/100