Obtrusive incorrect tooltips on Env Var editor fields

### Current Behavior

Tooltip tells me I cannot edit a new variable (or an editable variable)
Also, whenever I type additional characters a second tooltip appears covering the input box


### Expected Behavior

1. Tooltip should be conditioned to only show when an entry really is "not editable"
2. 2nd tooltip should never be permitted
3. Should never cover the input

### Steps To Reproduce

Open env var editor of an instance
Add a few variables
Click to place cursor - note 1st tooltip
Start editing item - note 2nd tooltip

### Environment

- FlowFuse version: FFC - live
- Node.js version:
- npm version:
- Platform/OS: Win 11
- Browser: Chrome Latest

### Have you provided an initial effort estimate for this issue?

I have provided an initial effort estimate