[NAVREDESIGN] Activity details screen

### **Description**

Update design of `Activity Details` screen.

### **Technical Details**

- Convert screen to new design
- Remove logic that conditionally hides `data` and show `view data` if there is txn.data

### **Acceptance Criteria**

- TBD

### **References**

- Figma - https://www.figma.com/file/qcwJHEEw5qyNru5mbFf6Oq/Nav-Redesign-Breakdown?node-id=114%3A3351
- ETA - 3 days

Start with the linked Figma design and locate the current Activity Details screen in the mobile app. Review how the screen handles transaction data and the conditional “view data” display. Done means the screen matches the new design and follows the requested transaction-data behavior, but acceptance criteria still need clarification.

Written by the indexing model from the issue text.