[BWA-271] Add custom refresh period

### Steps To Reproduce

1. hold down the code you want to edit
2. click edit
3. advanced
4. refresh period

### Expected Result

can we please have a "custom refresh period"

this is because when i edit the "name" or "username" and click save it defaults the refresh period to 30s and this invalidates the code

### Actual Result

defaults to 30s so it invalidates the code

### Screenshots or Videos

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### Additional Context

_No response_

### Build Version

2026.8.0

### What server are you connecting to?

EU

### Self-host Server Version

_No response_

### Environment Details

_No response_

### Issue Tracking Info

- [ ] I understand that work is tracked outside of Github. A PR will be linked to this issue should one be opened to address it, but Bitwarden doesn't use fields like "assigned", "milestone", or "project" to track progress.

Start in the Android app's edit flow by reproducing the path Advanced > Refresh period and searching the UI for that label. Trace what happens when the name or username is saved, then verify that a user-selected custom period is preserved instead of reverting to 30 seconds and invalidating the code.

Written by the indexing model from the issue text.