[Bug]: Perps add funds confirmation flow has fee visibility and cancel-routing issues

Describe the bug

Perps add-funds confirmation flow shows two problems: fee is 0 (is that right?), and cancel action routes the user to Activity instead of returning to the originating funding context.

Expected behavior

1. Confirmation should show the expected MetaMask fee information when applicable.
2. Cancel should return users to the previous funding context and preserve flow continuity.

Screenshots/Recordings

N/A

Steps to reproduce

1. Open MetaMask Extension in the EXP build.
2. Enter Perps and start Add funds flow.
3. Reach the confirmation step.
4. Review fee section.
5. Click Cancel.
6. Observe routing and flow destination.

Error messages or log output

N/A

Where was this bug found?

Internal release testing

Version

13.25.0 EXP March 25

Build type

Other (please specify exactly where you obtained this build in "Additional Context" section)

Browser

Chrome

Operating system

MacOS

Hardware wallet

N/A

Additional context

Found during internal PERPS release testing.

Severity

To be added by internal support / PM.

Reproduce the flow in the EXP build by opening Perps, starting Add funds, and reaching confirmation. Inspect the confirmation fee section and the Cancel route; done means applicable MetaMask fee information is shown and Cancel returns to the originating funding context while preserving flow continuity.