Turn StateSelect and CitySelect into autocomplete comboboxes so long
lists no longer bias people toward the top option. A shared FormCombobox
wraps shadcn's (Base UI) Combobox and bridges it to react-hook-form via
useController, storing the state code / city name while displaying a
label. Matching is accent-insensitive and prefix-based; the list opens
after 1 character and results are alphabetical. State searches by both
full name and initials (new StateNames map).
Adds @base-ui/react + shadcn combobox/input-group primitives, and
documents our export-const and named-hook-import conventions in the
components rule (with the src/components/ui/* shadcn carve-out).
- add group to collection with title, subtitle, and required consent relationship
- refactor to:
- use a dedicated shared zod schema
- submit via server action (create contact + signature)
- register RHF fields and handle pending/error states
- load city options from selected state
- add server action
- add shared schema
- replace state source in collection: derive select options from
- make immutable with and remove obsolete
- update generated payload types for petition and consent references
