Function preferenceTemplate

preferenceTemplate(
    previous: NostrEvent | undefined,
    archetype: string,
    catalogId: string,
    now: number,
): EventTemplate | undefined
The next version of the user's preferences for an archetype, with one handler moved to the front of the archetype-wide entries.

Every other tag and the encrypted private entries are carried over as they were, so the shell never drops a choice it could not read.
Parameters
- previous: NostrEvent | undefined
  The current event, when there is one.
- archetype: string
  The archetype slug.
- catalogId: string
  The handler the user chose.
- now: number
  Seconds since the epoch.
Returns EventTemplate | undefined
The event to sign, or undefined when the id has no reference form.
Example
```
preferenceTemplate(current, 'profile', candidate.id, Math.floor(Date.now() / 1000));
```