Advisory Summary: Regional scale

**As a** *RWCO/planning specialist* **I want** *to see # of advisories in my fire centre, (% of combustible land area, fire environment variables summarized at the regional scale)* **So That** *I can integrate this information into briefings and regional management strategies*

**Additional Context**
- Metrics are zonal metrics aggregated
- enter text here

**Acceptance Criteria**
- [ ] Given I click on a fire centre, Then I see the desired metrics (# of advisories, etc.)

**Definition of Done**
- Ready to Demo in Sprint Review
- Does what I have made have appropriate test coverage?
- Documentation and/or scientific documentation exists and can be found
- Peer Reviewed by 2 people on the team
- Manual testing of all PRs in Dev and Prod
- Merged

No files, tests, or entry points are named. Start by clarifying which fire-centre view and zonal metrics are required, where the regional aggregation should appear, and how the advisory count and combustible-area percentage will be validated; done means the agreed metrics are visible after selecting a fire centre and covered by appropriate tests and documentation.

Written by the indexing model from the issue text.