Fix decimal typing behavior for number inputs in tools form

[MumuTW]

Summary

• preserve raw numeric input text while typing in DynamicJsonForm number/integer fields
• avoid stripping intermediate decimal input like -74.0 caused by immediate numeric re-serialization
• keep existing numeric validation and commit normalized values on blur
• add regression test covering -74.0 -> -74.01 entry flow

Testing

• cd client && npm test -- --runTestsByPath src/components/tests/DynamicJsonForm.test.tsx

Fixes #1080

[cliffhall]

LGTM! 👍

Tested locally, verifying that the existing Inspector has the problem and that this PR fixes it.

@BobDickinson This fix also needs to be applied to the v1.5 core