Frontend: Display explicit secret loss warning on group or project delete
## Why are we doing this work
Currently, users receive a generic warning about losing secrets during project deletion/transfer. This lacks specificity and may cause accidental data loss.
## Relevant links
- #593451 - Backend: Expose secrets count via GraphQL for project delete/transfer warning (prerequisite)
## Implementation plan
- Hit the `project_secrets_count` / `group_secrets_count` GraphQL fields (exposed in #593451) on delete/transfer action dialogs
- Display an explicit warning with the secret count, e.g. "Danger: This project has 7 secrets that will be lost when you perform this action"
## Verification steps
- Navigate to a project with secrets and trigger the delete or transfer dialog
- Confirm the warning displays the correct number of secrets
- Confirm the warning is absent (or shows 0) for a project with no secrets
issue