Variable Tooltip Displays Old Value After Environment Change For gRPC Requests

### Expected Behavior

When switching the environment within a gRPC request (e.g., from Dev to Test), hovering over the “grpcUrl” variable displays the actual value from the environment in the tooltip.

### Actual Behavior

When switching the environment within a gRPC request (e.g., from Dev to Test), hovering over the “grpcUrl” variable still displays the old value from the previous environment in the tooltip. Clicking the variable shows the correct value for the selected environment (Edit Variable Dialog). After closing and reopening the request, the displayed value is correct again.

### Reproduction Steps

1. Open a gRPC Request
2. Switch to a different environment
3. Hover over a variable to view the tooltip
4. The value from the previous environment is displayed

(This behavior can only be reproduced intermittently.)

### Is there an existing issue for this?

- [x] I have searched the [issue tracker](https://www.github.com/Kong/insomnia/issues) for this problem.

### Which sync method do you use?

- [ ] Git sync.
- [x] Insomnia Cloud sync.
- [ ] Local only

### Additional Information

_No response_

### Insomnia Version

12.5.0

### What operating system are you using?

Windows

### Operating System Version

Windows 11 Enterprise Version 24H2

### Installation method

Download from insomnia.rest

### Last Known Working Insomnia version

_No response_

Start by reproducing the issue in a gRPC request while switching environments, then trace the variable tooltip and environment-selection paths. Confirm that the tooltip updates to the selected environment's value immediately, without needing to reopen the request.

Written by the indexing model from the issue text.