* feat: add datepicker dependency and init helper
* feat: calendar-first set-date modes with text fallback
* feat: initialize datepicker when opening set-date modes
* feat: render calendar and hints in set-date view
* chore: go mod tidy for bubble-datepicker direct dependency
Promotes github.com/ethanefung/bubble-datepicker from indirect to a
direct require (it is imported directly by internal/ui) and drops the
now-unused golang.org/x/text v0.3.8 checksums.
