Center the Home activity strip

TESTING.md

@@ -128,6 +128,8 @@ xcrun simctl launch booted de.rfc1437.gotcha
 
 - [ ] Home shows the selected server name, contribution total, nine labeled
       months with gaps between them, and recent activity.
+- [ ] The nine-month activity strip is horizontally centered beneath its title
+      without clipping either edge.
 - [ ] Activity rows have the correct icon, repository, summary, and date.
 - [ ] The compact icon row below the activity graph sits flat on the normal
       background with no border or pill and defaults to the clock. Select the

ios/Sources/ListScreens.swift

@@ -562,8 +562,11 @@ final class HeatmapView: UIView {
             (calendar.dateComponents([.day], from: firstWeek, to: lastDate).day ?? 0) / 7 + 1
         )
         let monthGap: CGFloat = 4
-        let width = max(4, min(6, (bounds.width - 32) / weekCount - 1))
+        let monthGaps = CGFloat(max(months.count - 1, 0)) * monthGap
+        let width = max(4, min(6, (bounds.width - 32 - monthGaps) / weekCount - 1))
         let gap = width + 1
+        let graphWidth = (weekCount - 1) * gap + width + monthGaps
+        let graphOrigin = max(0, (bounds.width - graphWidth) / 2)
         let labelAttributes: [NSAttributedString.Key: Any] = [
             .font: UIFont.preferredFont(forTextStyle: .caption2),
             .foregroundColor: UIColor.secondaryLabel,
@@ -572,7 +575,7 @@ final class HeatmapView: UIView {
             let days = calendar.dateComponents([.day], from: firstWeek, to: month).day ?? 0
             monthFormatter.string(from: month).draw(
                 at: CGPoint(
-                    x: 16 + CGFloat(days / 7) * gap + CGFloat(index) * monthGap,
+                    x: graphOrigin + CGFloat(days / 7) * gap + CGFloat(index) * monthGap,
                     y: 34
                 ),
                 withAttributes: labelAttributes
@@ -595,7 +598,7 @@ final class HeatmapView: UIView {
             colors[Int(min(cell.level, 4))].setFill()
             UIBezierPath(
                 roundedRect: CGRect(
-                    x: 16 + CGFloat(days / 7) * gap + CGFloat(monthIndex) * monthGap,
+                    x: graphOrigin + CGFloat(days / 7) * gap + CGFloat(monthIndex) * monthGap,
                     y: 48 + CGFloat(calendar.component(.weekday, from: date) - 1) * gap,
                     width: width,
                     height: width