WinUI-Gallery Fix app title bar gap beneath the caption buttons

Description

This PR fixes the app title bar gap beneath the caption buttons.

Motivation and Context

Provides a cleaner, more professional look.

How Has This Been Tested?

Ran the app and confirmed the change under different DPI, resolutions, and switches between them on Win 11.

Screenshots (if appropriate):

Current:

New:

Types of changes

[x] Bug fix (non-breaking change which fixes an issue)
[ ] New feature (non-breaking change which adds functionality)
[ ] Breaking change (fix or feature that would cause existing functionality to change)

Sep 17 '25 09:09 AndrewKeepCoding

/azp run

Sep 18 '25 06:09 Saharsh979

@Zakariathr22 Great catch! Thanks! I followed your suggestion (I guess you meant Margin instead of Padding).

Sep 19 '25 02:09 AndrewKeepCoding

I guess you meant Margin instead of Padding

Exactly!

Sep 19 '25 03:09 Zakariathr22

/azp run

Oct 06 '25 07:10 Saharsh979

@Zakariathr22 Yeah, but we don't know "when/if" this will be addressed, so I think we should adjust it for cleaner look.

That said, it's only noticeable when hovering over the caption buttons, so maybe it's not worth the extra effort. 😅 Still, IMHO, this is one of the small details that I'd personally fix. 🙂

Oct 30 '25 00:10 AndrewKeepCoding

/azp run

Dec 17 '25 09:12 marcelwgn