Add standard footer with BC Government governance and policy links throughout SIMS

(Awaiting UI specs from Shannon)

**As a** *SIMS user (student, ministry, institution)* **I want** *access to privacy, accessibility, and legal information from all pages within SIMS* **So That** *I can understand how my information is handled and find important policy information without leaving the service*

### Additional Context ###
Implement a persistent footer across applicable public and authenticated areas of SIMS containing links to the following BC Government resources:

Copyright -- [BC Government Copyright](https://www2.gov.bc.ca/gov/content/home/copyright)
Disclaimer -- [BC Government Disclaimer](https://www2.gov.bc.ca/gov/content/home/disclaimer)
Privacy -- [BC Government Privacy](https://www2.gov.bc.ca/gov/content/home/privacy)
Accessibility -- [Accessible Government](https://www2.gov.bc.ca/gov/content/home/accessible-government)

**For soak: should we include StudentAid BC Home page and Contact Us page?**

### Acceptance Criteria ###

- [ ] Display a footer on all applicable SIMS pages including the landing pages.
- [ ] The footer contains links to the Copyright, Disclaimer, Privacy and Accessibility pages
- [ ] Each link navigates to the correct BC Government webpage.
- [ ] Each link opens in a new tab when clicked.
- [ ] Links meet accessibility requirements and can be accessed using keyboard navigation and screen readers.
- [ ] Footer content displays correctly on desktop, tablet, and mobile devices and does not interfere with usability.
- [ ] Footer implementation is consistent across public and authenticated areas of SIMS.

### Business value ###

- Improves user access to important government policy information.
- Supports accessible and inclusive service delivery.
- Increases user confidence in the handling of personal information.
- Aligns SIMS with common government website and digital service patterns.
- Reduces effort by leveraging existing BC Government policy content rather than maintaining SIMS-specific versions.

Await the UI specs from Shannon, then review the existing public and authenticated page layouts, including landing pages, to identify where the persistent footer belongs. Verify the four BC Government URLs, new-tab behavior, keyboard and screen-reader access, responsive display, and consistent coverage across applicable SIMS pages.

Written by the indexing model from the issue text.