Gitignore tsconfig.tsbuildinfo; biome import order in lib/db.ts

TS incremental build state — regenerated on every `tsc --noEmit`, so
having it tracked meant every pre-commit typecheck dirtied the working
tree. Untrack + ignore.

Also picks up biome's preferred import order in lib/db.ts (external
package before node: modules).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: hsnice16

.gitignore

@@ -8,3 +8,4 @@ tmp-clones/
 .env.local
 .DS_Store
 next-env.d.ts
+tsconfig.tsbuildinfo