HTML Input date with php value marked as error

### Apache NetBeans version

Apache NetBeans 17

### What happened

In a PHP web page, this code
```php

```
is marked as error with this message
Bad value " " for attribute "value" on element "input": The literal did not satisfy the date format.

### How to reproduce

Open a web project of type PHP and in a php page paste:
```php

```

### Did this work correctly in an earlier version?

No / Don't know

### Operating System

Debian 11

### JDK

JDK 11 - /usr/lib/jvm/java-11-openjdk-amd64

### Apache NetBeans packaging

Apache NetBeans binary zip

### Anything else

This happens because the value of the attribute value is seen as a literal text instead of a php variable, despite it's a php page.

### Are you willing to submit a pull request?

No

Reproduce the warning in a PHP web project using the shown date input on a PHP page, then trace the HTML validation path that handles PHP attribute values. Done means the PHP variable is not treated as literal date text and the input is no longer marked with the date-format error.

Written by the indexing model from the issue text.