Adds comprehensive unit tests for `resolveVideoPointer` in `js/utils/videoPointer.js`.
The new tests cover:
- Happy paths for address (a-tag) and event (e-tag) pointers.
- Priority logic (dTag > videoRootId > fallbackEventId).
- Input normalization (trimming, lowercasing).
- Relay inclusion in pointer arrays.
- Default kind handling (fallback to 30078).
- Edge cases and invalid inputs returning null.
This improves test coverage for core video pointer resolution utility.
Co-authored-by: PR0M3TH3AN <[email protected]>
