chore(hooks): add knip check to push hook

Add knip dependency check to the push hook to catch unused dependencies
before they are pushed to the repository.

Author: ryoppippi

lefthook.yaml

@@ -9,3 +9,8 @@ pre-commit:
       glob: '*'
       run: bun oxfmt --no-error-on-unmatched-pattern {staged_files}
       stage_fixed: true
+
+push:
+  jobs:
+    - name: knip
+      run: pnpm run lint:knip