chore(build): add typescript declaration files to vscodeignore

- Add `**/*.d.ts` pattern to exclude TypeScript declaration files from VS Code extension bundle
- Keep bundle size optimised by excluding development-only files
- Maintain consistency with existing TypeScript-related ignore patterns

Author: tsdevau

.vscodeignore

@@ -7,6 +7,7 @@
 *.config.mjs
 **/*.map
 **/*.ts
+**/*.d.ts
 **/tsconfig*.json
 compile.mjs
 coverage/