fix(macos): put hour gutter labels on the 1 am track origin like web

apps/calendar-macos/CompassUI/Sources/CompassUI/TimeGrid/TimeGridView.swift

@@ -390,18 +390,19 @@ public final class TimeGridView: NSView {
         palette: (background: NSColor, surface: NSColor, surfaceRaised: NSColor, border: NSColor, text: NSColor, textMuted: NSColor),
         currentHour: Int
     ) {
-        // Web `CalendarTimeColumn`: `top: calc(100% / TIMED_VISIBLE_HOURS - 5px)`.
-        let labelColumnTop = max(0, hourHeight - 5)
-        for hour in 0 ..< Int(ceil(state.civilDayHours)) {
-            let text = hour == 0 ? "" : (labels.indices.contains(hour - 1) ? labels[hour - 1] : "")
+        // Web `HourLabelColumn` (#4686): one hour slot per label from 1 AM,
+        // starting at the top of the track, the same 1 AM origin cards, hour
+        // lines and the now line use (`timedGridTopPx`). The old
+        // `calc(100% / TIMED_VISIBLE_HOURS - 5px)` offset plus an empty first
+        // slot drew every label two hours below its events.
+        for (index, text) in labels.enumerated() {
             let label = NSTextField(labelWithString: text)
             label.font = CompassFont.nsFont(size: 10)
-            let isCurrentHour = hour > 0 && hour == currentHour
-            label.textColor = isCurrentHour ? themeAccentColor : palette.textMuted
+            label.textColor = index + 1 == currentHour ? themeAccentColor : palette.textMuted
             label.alignment = .center
             label.frame = NSRect(
                 x: xOffset + 4,
-                y: labelColumnTop + Double(hour) * hourHeight + 4,
+                y: Double(index) * hourHeight + 1,
                 width: width - 8,
                 height: 14)
             hourGutterView.addSubview(label)

apps/calendar-macos/CompassUI/Tests/CompassUIUnitTests/TimeGridCivilDayTests.swift

@@ -28,6 +28,26 @@ final class TimeGridCivilDayTests: XCTestCase {
         }
     }
 
+    /// Web #4686: the 5 PM label sits at the top of the 5 PM slot, where a
+    /// 5 PM event starts (1 AM track origin), not two hours lower.
+    func testHourLabelsShareTheEventTrackOrigin() throws {
+        let savedZone = EffectiveTimeZone.identifier
+        defer { EffectiveTimeZone.identifier = savedZone }
+        EffectiveTimeZone.identifier = "UTC"
+        let state = TimeGridState(layoutMode: .day,
+            scenario: GridLayoutScenario(layoutMode: .day,
+                referenceNow: GridLayoutSnapshotFixtures.referenceNow, visibleDateKeys: ["2026-05-20"]),
+            effectiveTimeZone: "UTC")
+        let view = TimeGridView(state: state, theme: .lightBeach)
+        view.frame = NSRect(x: 0, y: 0, width: 800, height: 600)
+        view.layoutSubtreeIfNeeded()
+        let document = try XCTUnwrap(descendants(view).compactMap { $0 as? NSScrollView }.first?.documentView)
+        let hourHeight = (document.frame.height - GridTimeConstants.gridPaddingBottom) / state.civilDayHours
+        let label = try XCTUnwrap(descendants(view).compactMap { $0 as? NSTextField }.first { $0.stringValue == "5 PM" })
+        let eventTop = GridTimeConstants.timedGridTopPx(minutesFromCivilMidnight: 17 * 60, hourHeight: hourHeight)
+        XCTAssertEqual(label.frame.minY, eventTop, accuracy: 3, "5 PM label at \(label.frame.minY), 5 PM event top at \(eventTop)")
+    }
+
     private func descendants(_ view: NSView) -> [NSView] {
         view.subviews.flatMap { [$0] + descendants($0) }
     }

docs/features/desktop-web-parity-checklist.md

@@ -341,6 +341,7 @@ Each PR should link a child issue, include before/after screenshots (web Chromiu
 | 2026-10-21 | Hold-Mod sidebar chips: month picker and Up next chips render, calendar list chip moved onto the list (compare run 39634795849) |
 | 2026-10-21 | Per-account page-jump targets (web `calendar-account:` ids) |
 | 2026-10-21 | Event jump chips use web day-prefix labels (W1, SU2) and digits after a day pick |
+| 2026-10-22 | Week/day hour gutter labels use web's 1 AM track origin (#4686); they sat two hours below their events (a 5 PM event drew on the 3 PM row) |
 | 2026-10-22 | Parity capture draws popover windows (form date picker, time list) over the window render, so those surfaces stop showing a closed field |
 | 2026-10-22 | macOS capture: register `onboarding-welcome-account-choice` so the welcome account step exports instead of timing out |