Update hourMinuteTextStyle defaults for Material 3 Time Picker

[TahaTesser]

fixes hourMinuteTextStyle Material 3 default doesn't match the specs

This updates hourMinuteTextStyle defaults to match Material 3 specs. hourMinuteTextStyle should use different font style for different entry modes based on the specs.

Specs

Before

 return _textTheme.displayMedium!.copyWith(color: _hourMinuteTextColor.resolve(states));

After

      return entryMode == TimePickerEntryMode.dial
        ? _textTheme.displayLarge!.copyWith(color: _hourMinuteTextColor.resolve(states))
        : _textTheme.displayMedium!.copyWith(color: _hourMinuteTextColor.resolve(states));

Pre-launch Checklist

• I read the Contributor Guide and followed the process outlined there for submitting PRs.
• I read the Tree Hygiene wiki page, which explains my responsibilities.
• I read and followed the Flutter Style Guide, including Features we expect every widget to implement.
• I signed the CLA.
• I listed at least one issue that this PR fixes in the description above.
• I updated/added relevant documentation (doc comments with ///).
• I added new tests to check the change I am making, or this PR is test-exempt.
• All existing and new tests are passing.

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[gspencergoog]

[gspencergoog]

Maybe make this a switch instead, so that if we add more modes it will flag it.

[TahaTesser]

Thank you so much! This actually saved me from making mistake. I totally forgot to handle dialOnly and inputOnly modes.

Now it will look like this:

      return switch (entryMode) {
        TimePickerEntryMode.dial || TimePickerEntryMode.dialOnly
          => _textTheme.displayLarge!.copyWith(color: _hourMinuteTextColor.resolve(states)),
        TimePickerEntryMode.input || TimePickerEntryMode.inputOnly
          => _textTheme.displayMedium!.copyWith(color: _hourMinuteTextColor.resolve(states)),
      };