feat: migrate to TypeScript 6 and add tsgo

- Upgrade typescript from ^5 to ^6 across all packages
- Address TS6 breaking changes in tsconfig files:
  - Add explicit types array (new default is [])
  - Remove deprecated baseUrl (paths work without it)
  - Remove redundant esModuleInterop: true
  - Merge DOM.Iterable into DOM lib
- Install @typescript/native-preview for tsgo CLI
- Enable tsgo in VS Code settings

Co-authored-by: Ona <no-reply@ona.com>

tsconfig.json

@@ -14,6 +14,9 @@
 		"verbatimModuleSyntax": true,
 		"noEmit": true,
 
+		// Types
+		"types": ["bun"],
+
 		// Best practices
 		"strict": true,
 		"skipLibCheck": true,