bug: ion-datetime-button does not respect minuteValues and others

[Ionaru]

Prerequisites

• I have read the Contributing Guidelines.
• I agree to follow the Code of Conduct.
• I have searched for existing issues that already report this problem, without success.

Ionic Framework Version

v8.x

Current Behavior

A ion-datetime-button element will default to an unselectable date or time when these properties are used on the ion-datetime element:

• monthValues
• dayValues
• yearValues
• hourValues
• minuteValues

Expected Behavior

The ion-datetime-button contents should default to show the closest available valid value. Like the example for ion-datetime does.

Steps to Reproduce

1. Use this template code

<ion-modal [keepContentsMounted]="true">
  <ng-template>
    <ion-datetime id="datetime" minuteValues="0" />
  </ng-template>
</ion-modal>

2. See the button show any date or time outside the values allowed by minuteValues (or the other properties)

Code Reproduction URL

https://stackblitz.com/edit/sgkfctaz?file=src%2Fapp%2Fexample.component.html

Ionic Info

Ionic:

   Ionic CLI                     : 7.2.0 (C:\Users\<NAME>\AppData\Local\nvs\node\22.12.0\x64\node_modules\@ionic\cli)
   Ionic Framework               : @ionic/angular 8.4.2 (C:\Users\<NAME>\Projects\<PROJECT>\node_modules\@ionic\angular)
   @angular-devkit/build-angular : 19.1.4 (C:\Users\<NAME>\Projects\<PROJECT>\node_modules\@angular-devkit\build-angular)
   @angular-devkit/schematics    : 19.1.4 (C:\Users\<NAME>\Projects\<PROJECT>\node_modules\@angular-devkit\schematics)
   @angular/cli                  : 19.1.4 (C:\Users\<NAME>\Projects\<PROJECT>\node_modules\@angular\cli)
   @ionic/angular-toolkit        : 12.1.1 (C:\Users\<NAME>\Projects\<PROJECT>\node_modules\@ionic\angular-toolkit)

Capacitor:

   Capacitor CLI      : not installed
   @capacitor/android : 6.2.0 (C:\Users\<NAME>\Projects\<PROJECT>\node_modules\@capacitor\android)
   @capacitor/core    : 6.2.0 (C:\Users\<NAME>\Projects\<PROJECT>\node_modules\@capacitor\core)
   @capacitor/ios     : 6.2.0 (C:\Users\<NAME>\Projects\<PROJECT>\node_modules\@capacitor\ios)

Utility:

   cordova-res : not installed globally
   native-run  : not installed globally

System:

   NodeJS : v22.12.0 (C:\Users\<NAME>\AppData\Local\nvs\default\node.exe)
   npm    : 11.1.0
   OS     : Windows 10

Additional Information

Possibly related to #24722