Update ToolsTab to handle empty number inputs correctly

[ln-12]

This pull request updates the number handling for empty text fields. Fixes #623.

Motivation and Context

When adding a number as tool parameter and removing it again, it is parsed as empty string which breaks the parsing at the server side. The error looks something like this:

MCP error 0: unmarshaling: json: cannot unmarshal string into Go struct field Request.count of type uint32

How Has This Been Tested?

I tested the changes by changing the input parameters and verifying the the values are sent as expected.

Breaking Changes

No

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation update

Checklist

• I have read the MCP Documentation
• My code follows the repository's style guidelines
• New and existing tests pass locally (actually no, the same tests as on the main branch are failing)
• I have added appropriate error handling
• I have added or updated documentation as needed

Additional context

No