Android: toValidMinuteInterval returns 30 unconditionally, preventing other minute intervals

[strannikhead]

Summary:
The Android version utilizes the toValidMinuteInterval function (located in app/utils/datetime.ts). Consequently, any attempt to set a different interval (e.g., 10 minutes) results in the step defaulting to 30 minutes, which is unexpected behavior for Android-specific code.

File / Link:
https://github.com/mattermost/mattermost-mobile/blob/main/app/utils/datetime.ts#L13-L24

Environment:

• Mattermost mobile app version: Latest (2.43.0)
• OS: Android

Reproduction:

1. Open an interactive dialog containing a date-time picker.
2. When attempting to set the time, it resets to the nearest 30-minute interval.

Observed behavior:

• On Android, the minute selection interval is always 30 (the function unconditionally returns 30 if Platform.OS !== 'ios'), preventing the use of other intervals and making it impossible to select other values.

Expected behavior:

• The ability to select a time that is a multiple of the specified interval.