Add modification date (timestamp) to Alignment

Specs:

1. Update AlignmentOutput in dna/zomes/how/src/alignment.rs to include the entry Header that’s available in get_alignments_inner() from the alignment_entries Vec
2. Update tests with one simple assert to show that header info is returned from the zome call

• Cargo dna/zomes/how/tests/behaviors.rs
• tryorama tests/src/how.ts

3. Update ui/lib/src/types.ts to match the added Header on the Rust side
4. Update ui/lib/src/elements/how-alignment.ts to display the timestamp information