Add two lint mechanisms to catch the Ink error "<Box> can't be nested
inside <Text> component" at build/lint time rather than runtime:
1. Biome GritQL plugin (no-box-in-text.grit) - for Biome v2+ users
2. Build-time check script (check-box-in-text.ts) - standalone AST check
These help prevent the runtime error that occurs when Box components
are incorrectly nested inside Text components in Ink applications.
