Date Input Fields / Vuetify

**User Story**
Some fields in vuetify are not classified as date inputs, we should use the correct field types to enforce consistency.

**Acceptance Criteria**
- [ ] Update fields where `v-text-field` to `v-date-input` where they are used to enter dates:
- [ ] Approved designation modal
- [ ] Approve program modal
- [ ] Edit student profile modal
- [ ] SIN expiration modal

Locate the Approved designation, Approve program, Edit student profile, and SIN expiration modals, then inspect their date-entry fields. Replace only the relevant v-text-field usages with v-date-input and verify each listed modal uses the correct date input consistently.

Written by the indexing model from the issue text.