Fix CI cache for storybook (#14038)

In this PR:
- Migrate twenty-ui to ES2020 (removing undesired type errors during
build)
- Make CI cache work again between `sb-build` and `sb-test` steps

(Note: also fixing a minor bug on Notes)

Total CI time: ~8min
<img width="1088" height="531" alt="image"
src="https://github.com/user-attachments/assets/0bd0a99a-c69e-491d-91b2-9ddf6622464a"
/>

Both node_modules and sb-build caches are being hit now
<img width="1154" height="722" alt="image"
src="https://github.com/user-attachments/assets/a5addcee-51d2-4f51-9ff6-d02cd25da49a"
/>

.github/workflows/actions/save-cache/action.yaml

@@ -15,7 +15,7 @@ runs:
         key: ${{ inputs.key }}
         path: |
           .cache
-          .nx/cache
+          .nx
           node_modules/.cache
           packages/*/node_modules/.cache
           ${{ inputs.additional-paths }}