chore: standardize tsconfig to ESNext and update deps

- Set target, lib, and module to ESNext for consistency
- Migrate biome.json schema to 2.4.3
- Update all dependencies to latest via bun update

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: philoserf

biome.json

@@ -1,5 +1,5 @@
 {
-  "$schema": "https://biomejs.dev/schemas/2.3.11/schema.json",
+  "$schema": "https://biomejs.dev/schemas/2.4.3/schema.json",
   "vcs": {
     "enabled": true,
     "clientKind": "git",