Handle a hit on activity

#### Description:

As part of search, if someone searches activity, that's a hit.

#### Acceptance Criteria:
[Note: Use 'Given/When/Then' format if it makes sense to. Otherwise, a simple checklist that can be tested.]

#### Development Checklist:

- [ ] ...
- [ ] ...
- [ ] ...

#### Dependencies

- Blocked by
- Blocking

**Relevant documentation as reference**

**Definition of Ready**

- [ ] Acceptance criteria are included
- [ ] Wireframes are included (if applicable)
- [ ] Design / Solution is accepted by Product Owner (if applicable)
- [ ] Dependencies are identified (technical, business, regulatory/policy)
- [ ] Story has been estimated (under 13 pts)

**Definition of Done**
- In progress:
- [ ] Acceptance criteria are tested (Functionality meets the acceptance criteria defined in the ticket)
- [ ] UI meets accessibility requirements
- [ ] Unit tests are written
- [ ] Work is traceable in GitHub
- [ ] PR linked to ticket number
- [ ] If needed/required - Dev adds flag/label to highlight any migration steps necessary prior to PROD deployment
- Code review:
- [ ] Code is peer reviewed and has passed CI/CD tests
- QA:
- [ ] Acceptance criteria are tested (Functionality meets the acceptance criteria defined in the ticket)
- [ ] Code is potentially shippable to the production environment
- [ ] Functional features have been tested and passed by QA
- [ ] UI components tested by designer
- [ ] Code is deployed to PROD when moved to 'done' column (unless requested otherwise by PO)
- PO Review:
- [ ] Acceptance criteria are tested (Functionality meets the acceptance criteria defined in the ticket)
- [ ] Reviewed and approved by Product Owner

#### Notes:
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The issue names only a search behavior: searching for “activity” should count as a hit. No file, test, acceptance criterion, or entry point is provided, so first locate the repository’s search implementation and determine how hits are currently defined. Done means the expected activity search is recognized and the behavior is covered by a test.

Written by the indexing model from the issue text.