input_text helper: it is possible to define a length > 255

[ildar170975]

Checklist

• I have updated to the latest available Home Assistant version.
• I have cleared the cache of my browser.
• I have tried a different browser to see if it is related to my browser.
• I have tried reproducing the issue in safe mode to rule out problems with unsupported custom resources.

Describe the issue you are experiencing

Reported here: https://community.home-assistant.io/t/text-helper-limit-to-255-characters-i-was-able-to-bug-it/860136

Describe the behavior you expected

Should not be possible to define a length > 255

Steps to reproduce the issue

see above

What version of Home Assistant Core has the issue?

2025.3

What was the last working version of Home Assistant Core?

No response

In which browser are you experiencing the issue?

No response

Which operating system are you using to run this browser?

No response

State of relevant entities

Problem-relevant frontend configuration

Javascript errors shown in your browser console/inspector

Additional information

No response

[cedricdelecole]

I am "proud" I was able to maybe contribute and find this bug.
Though I have reported this "bug" on another location, HA Core, because I wasn't sure where to do it ...
So this issue may be duplicate

[ildar170975]

@cedricdelecole
Let guys from HA dev team decide which part of HA this bug belongs to...

[ildar170975]

For the record - this is an issue registered in Core: home-assistant/core#140054