Kanban.xcodeproj must be regenerated (xcodegen generate) before building.
CardWindowMetrics.commentsColumnWidth was a fixed figure between the body
column and the comments pane in the side-by-side layout; it is now only the
resting default. A new CommentsColumnDivider replaces the plain Divider()
between the two panes with a real HStack element carrying a resize-left-right
cursor and a drag gesture, clamped through a new pure seam,
CardWindowMetrics.clampedCommentsColumnWidth — never narrower than the
existing commentsMinimumWidth floor, never wide enough to push the body under
its own bodyMinimumWidth. The drag tracks live in memory
(commentsColumnWidthOverride) and writes AppPreferences.commentsColumnWidthKey
exactly once, on release, mirroring LaneResizeSession's live-track/write-once
split rather than hammering UserDefaults per tick.
Persistence is app-wide via @AppStorage, matching showComments and
commentsBesideBody — the pane's other two layout bits — rather than the
per-card BoardRegistry.cardWindowFrames: this is "how the pane is arranged,"
the same kind of fact those two already are, not a per-card window geometry.
Flagged on the card thread as a call worth owner review.
Six new unit tests cover the clamp's two floors, the degenerate case where a
container is too narrow for both, and its agreement with
CardWindowMetrics.minimumSize at the window's own floor.
Claude-Session: https://claude.ai/code/session_014PtZdPwqZuqEDLc6wZMtEy
