The board learns to zoom — eight rungs on one ruler, and Actual Size is the untouched board

View ▸ Zoom In / Zoom Out / Actual Size (⌘+ / ⌘− / ⌘0): 75%–200% in eight
rungs, app-wide and persisted (the Show Comments precedent) — a viewing
comfort, not a property of any one board. The level travels as
BoardZoomContext in the environment, injected on BoardView alone so the
banner strip, search bar, sheets and popovers stay at the system size; the
environment is also what carries it through CardFaceView's equality gate,
which compares nothing that moves with the level. Every BoardMetrics figure
follows zoom.bodyPointSize — card and lane chrome, drag replicas and the
count badge, the resize handle, the trash column — and the drop registry
carries the ruler for event-time reads, with the autoscroller's three
reaches turning font-derived (reachSide named as the stripGap it always
equalled). Lanes still divide the window; zoom never moves the window or
its floor. The toolbar gains a catalog-only Zoom In/Out pair mirroring the
menu rows' predicate; zoom holds shut mid-drag (frozen geometry), each rung
announces itself to VoiceOver, and the render suite pins both invariants:
a rung repaints every face, a no-op Actual Size repaints nothing.

Claude-Session: https://claude.ai/code/session_014PtZdPwqZuqEDLc6wZMtEy

Kanban/UI/Board/LaneResizeHandle.swift

@@ -38,14 +38,18 @@ struct LaneResizeHandle: View {
     /// cursor.
     @State private var cursorPushed = false
 
+    /// The board's ruler (`BoardZoom`) — the gap this strip is proportioned against moves with the
+    /// level, so the grab target has to move with it too or it drifts off the gap it lives in.
+    @Environment(\.boardZoom) private var zoom
+
     /// The grab strip's width and its rightward shift — both font-derived, because the inter-lane
     /// gap they are proportioned against is (`BoardMetrics.stripGap`, 10-accessibility.md's
     /// full-relative-scaling rule). At the standard body size they are the 12pt and 8pt the strip
     /// has always used: with the strip trailing-aligned, +8 leaves 4pt over the lane and hangs 8pt
     /// into the gap (clear of the lane's own scrollbar).
-    private var handleWidth: CGFloat { BoardMetrics.resizeHandleWidth(bodyPointSize: BoardMetrics.bodyPointSize) }
+    private var handleWidth: CGFloat { BoardMetrics.resizeHandleWidth(bodyPointSize: zoom.bodyPointSize) }
 
-    private var overhang: CGFloat { BoardMetrics.resizeHandleOverhang(bodyPointSize: BoardMetrics.bodyPointSize) }
+    private var overhang: CGFloat { BoardMetrics.resizeHandleOverhang(bodyPointSize: zoom.bodyPointSize) }
 
     var body: some View {
         Color.clear