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Replace the SwiftUI-only CodeFileTextView with a UIViewRepresentable backed
by CodeFileUIView. The previous approach could not support a fixed line number
gutter while independently scrolling code content horizontally.
Changes:
- Gutter is pinned outside the horizontal scroll view and never scrolls left
- Vertical scroll is handled by a single outer UIScrollView shared by both
the gutter and code content, keeping them in sync
- Line numbers are right-aligned in a fixed-width gutter calculated from
the total line count
- Syntax highlighting via Splash for .swift files, with plain monospaced
rendering as fallback for unsupported file types
- Wrap toggle persisted via AppStorage (wrapRepositoryFileLines)
- Bottom toolbar replaces the floating Share button, adding Copy All and
Wrap toggle actions
- Copy All shows a brief checkmark confirmation that resets after 2 seconds
- Font fixed at SFMono-Regular 12pt, not scaled with Dynamic Type
Implements: https://todo.sr.ht/~ccleberg/Hutch/7
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