Add ESLint TypeScript rules and translation validation

Summary

• Add ESLint rules for TypeScript strict typing (no-explicit-any, consistent-type-assertions)
• Add translation validation scripts to ensure translation consistency across locales
• Fix invalid translation key search.no_results → search_page.no_results
• Document all new rules and scripts in CLAUDE.md

Changes

ESLint TypeScript Rules

• @typescript-eslint/no-explicit-any (warn) - discourages any type usage
• @typescript-eslint/consistent-type-assertions (warn) - discourages type assertions while allowing as const and object literals as parameters

Translation Validation Scripts

Two new scripts in scripts/ folder:

1. check-blog-translations.js - Cross-locale key sync

   • Compares all locales against English reference
   • Reports missing/extra keys per locale

2. check-blog-translation-usage.js - Code usage validation

   • Scans for t('key') and <Trans i18nKey="key">
   • Reports keys used in code that don't exist
   • Optional --unused flag for unused keys

Usage

pnpm --filter @hive/blog lint                      # ESLint with new rules
pnpm --filter @hive/blog lint:translations         # Cross-locale validation
pnpm --filter @hive/blog lint:translations:usage   # Code usage validation

Test plan

• ESLint rules work and show warnings for any types
• lint:translations detects missing keys across locales
• lint:translations:usage passes after fixing search.no_results
• Scripts handle edge cases (nested keys, dynamic keys, Trans component)

🤖 Generated with Claude Code