Fix ancestors scroll view expanding to full height

[antons]

This fixes the ancestors view not filling all available vertical space, analogous to #2802 and 2bba54d.

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[greptile-apps]

Greptile Summary

The PR changes the ancestors content view from Auto Layout constraints to fixed-frame autoresizing so it fills the available vertical space consistently.

• Adds width- and height-sizable autoresizing to the ancestors content view.
• Removes constraints that previously governed the content view’s edges.

Confidence Score: 5/5

The PR appears safe to merge, with the ancestors view following the existing sidebar autoresizing pattern.

The fixed sidebar width and coordinated vertical autoresizing preserve the content view’s intended margins as the document window changes size, and no concrete behavioral failure remains.

Important Files Changed

Filename	Overview
GitUp/Application/Base.lproj/Document.xib	Replaces the ancestors content view’s edge constraints with the established fixed-frame and autoresizing-mask layout pattern; no actionable regression was identified.

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