Enforce Rust and Swift ownership boundary

ios/Sources/ListScreens.swift

@@ -303,17 +303,6 @@ final class HomeViewController: RefreshingTableViewController {
         case all
         case issues
         case pulls
-
-        func includes(_ row: ActivityRow) -> Bool {
-            switch self {
-            case .all:
-                return true
-            case .issues:
-                return row.icon.contains("issue")
-            case .pulls:
-                return row.icon.contains("pull")
-            }
-        }
     }
 
     private let context: AppContext
@@ -321,7 +310,12 @@ final class HomeViewController: RefreshingTableViewController {
     private var filter = ActivityFilter.all
 
     private var activities: [ActivityRow] {
-        page?.activities.filter(filter.includes) ?? []
+        guard let page else { return [] }
+        switch filter {
+        case .all: return page.activities
+        case .issues: return page.issueActivities
+        case .pulls: return page.pullActivities
+        }
     }
 
     init(context: AppContext) {
@@ -443,20 +437,7 @@ final class HeatmapView: UIView {
     private let calendar = Calendar(identifier: .gregorian)
 
     init(page: HomePage, selectedFilter: Int, onFilter: @escaping (Int) -> Void) {
-        let latest = page.heatCells.last.map {
-            Date(timeIntervalSince1970: TimeInterval($0.timestamp))
-        } ?? Date()
-        let latestMonth = Calendar(identifier: .gregorian).date(
-            from: Calendar(identifier: .gregorian).dateComponents([.year, .month], from: latest)
-        ) ?? latest
-        let firstMonth = Calendar(identifier: .gregorian).date(
-            byAdding: .month,
-            value: -8,
-            to: latestMonth
-        ) ?? latestMonth
-        cells = page.heatCells.filter {
-            Date(timeIntervalSince1970: TimeInterval($0.timestamp)) >= firstMonth
-        }
+        cells = page.heatCells
         super.init(frame: CGRect(x: 0, y: 0, width: 0, height: 180))
         backgroundColor = .systemBackground
         let title = UILabel(frame: CGRect(x: 16, y: 12, width: 300, height: 22))
@@ -465,7 +446,7 @@ final class HeatmapView: UIView {
         title.textColor = .secondaryLabel
         addSubview(title)
         let total = UILabel(frame: CGRect(x: 16, y: 108, width: 300, height: 18))
-        total.text = "\(cells.reduce(0) { $0 + $1.contributions }) contributions"
+        total.text = "\(page.contributionCount) contributions"
         total.font = .preferredFont(forTextStyle: .caption1)
         total.textColor = .tertiaryLabel
         addSubview(total)