Custom status text is not limited to 30 characters

### Steps to reproduce

Set a custom status with a text that is longer than 30 characters.

### Outcome

#### What did you expect?

I can not enter more than 30 characters.

#### What happened instead?

I could enter more than 30 characters.

### Operating system

_No response_

### Browser information

_No response_

### URL for webapp

_No response_

### Application version

_No response_

### Homeserver

_No response_

### Will you send logs?

Yes

Start by locating the custom status input and reproduce the issue with text longer than 30 characters. Trace where the input accepts or validates the status text, then verify that entering more than 30 characters is prevented and that the relevant frontend checks pass.

Written by the indexing model from the issue text.