Add an open source passport footer to About

[kyleve]

Posted by an AI agent on kve’s behalf.

Summary

• add a compact passport-style GitHub link with a subtle accent glow at the bottom of Settings > About
• share the guilloché rosette renderer with the existing Locations cards while keeping footer styling independently tokenized
• add in-file previews required by the architecture lint
• capture every About snapshot at intrinsic full-content height across the existing iPhone and iPad matrices
• teach SnapshotKitTesting to measure UIKit-backed SwiftUI forms from their root scroll content, with a regression test
• localize the new copy, extend Settings search terms, and refresh About documentation

Testing

• ./swiftformat --lint
• ./xcstrings --lint
• swift run bumper lint . --timings
• ./test WhereUITests (345 tests passed)
• ./test SnapshotKitTestingTests (41 tests passed)
• focused About snapshot matrix (16 configurations passed after recording and visual review)
• focused Locations snapshot matrix passed