feat: upcoming section — collapse, 5-item cap, show more

Default view shows the next 5 upcoming tasks. If more exist, a
"N more ↓" button expands the full list; tapping again collapses
back to 5. The section header is tappable to fully hide the list
(only title + count badge remain visible). Collapsed state is
persisted via @AppStorage so it survives app restarts.

KisaniCal/Views/TodayView.swift

@@ -132,32 +132,12 @@ struct TodayView: View {
 
                     // ── Upcoming ──
                     if !taskVM.upcomingTasks.isEmpty {
-                        HStack {
+                        UpcomingSection(
-                            SectionLabel(text: "Upcoming")
+                            tasks: taskVM.upcomingTasks,
-                            Text("\(taskVM.upcomingTasks.count)")
+                            onToggle:   { taskVM.toggle($0) },
-                                .font(AppFonts.mono(9))
+                            onPostpone: { taskVM.postpone($0) },
-                                .foregroundColor(AppColors.text3(cs).opacity(0.55))
+                            onDelete:   { taskVM.delete($0) }
-                        }
+                        )
-                        .padding(.horizontal, 18)
-                        .padding(.top, 14)
-                        .padding(.bottom, 6)
-
-                        ForEach(taskVM.upcomingTasks.prefix(20)) { task in
-                            TaskRowView(task: task) {
-                                withAnimation(KisaniSpring.snappy) { taskVM.toggle(task) }
-                            }
-                            .contextMenu {
-                                Button { withAnimation { taskVM.postpone(task) } } label: {
-                                    Label("Postpone 1 Day", systemImage: "clock.arrow.circlepath")
-                                }
-                                Divider()
-                                Button(role: .destructive) { withAnimation { taskVM.delete(task) } } label: {
-                                    Label("Delete", systemImage: "trash")
-                                }
-                            }
-                            .padding(.horizontal, 18)
-                            .padding(.bottom, 5)
-                        }
                     }
 
                     let hasAnything = !taskVM.overdueTasks.isEmpty || !taskVM.todayTasks.isEmpty
@@ -580,6 +560,104 @@ private struct SessionSectionHeader: View {
     }
 }
 
+// MARK: - Upcoming Section
+
+struct UpcomingSection: View {
+    @Environment(\.colorScheme) private var cs
+    let tasks:      [TaskItem]
+    let onToggle:   (TaskItem) -> Void
+    let onPostpone: (TaskItem) -> Void
+    let onDelete:   (TaskItem) -> Void
+
+    @AppStorage("upcomingCollapsed") private var collapsed = false
+    @State private var showAll = false
+
+    private let pageSize = 5
+
+    private var visible: [TaskItem] {
+        showAll ? tasks : Array(tasks.prefix(pageSize))
+    }
+
+    var body: some View {
+        VStack(alignment: .leading, spacing: 0) {
+
+            // ── Header (tappable to collapse) ──
+            HStack(spacing: 6) {
+                Text("Upcoming")
+                    .font(AppFonts.sans(10.5, weight: .semibold))
+                    .foregroundColor(AppColors.text3(cs))
+
+                Text("\(tasks.count)")
+                    .font(AppFonts.mono(9, weight: .semibold))
+                    .foregroundColor(AppColors.text3(cs).opacity(0.5))
+                    .padding(.horizontal, 6).padding(.vertical, 2)
+                    .background(AppColors.surface2(cs))
+                    .clipShape(Capsule())
+
+                Spacer()
+
+                Image(systemName: "chevron.down")
+                    .font(.system(size: 10, weight: .semibold))
+                    .foregroundColor(AppColors.text3(cs).opacity(0.6))
+                    .rotationEffect(.degrees(collapsed ? -90 : 0))
+                    .animation(KisaniSpring.micro, value: collapsed)
+            }
+            .padding(.horizontal, 18)
+            .padding(.top, 14)
+            .padding(.bottom, collapsed ? 2 : 8)
+            .contentShape(Rectangle())
+            .onTapGesture {
+                withAnimation(KisaniSpring.snappy) {
+                    collapsed.toggle()
+                    if !collapsed { showAll = false }
+                }
+            }
+
+            if !collapsed {
+                // Task rows
+                ForEach(visible) { task in
+                    TaskRowView(task: task) {
+                        withAnimation(KisaniSpring.snappy) { onToggle(task) }
+                    }
+                    .contextMenu {
+                        Button { withAnimation { onPostpone(task) } } label: {
+                            Label("Postpone 1 Day", systemImage: "clock.arrow.circlepath")
+                        }
+                        Divider()
+                        Button(role: .destructive) { withAnimation { onDelete(task) } } label: {
+                            Label("Delete", systemImage: "trash")
+                        }
+                    }
+                    .padding(.horizontal, 18)
+                    .padding(.bottom, 5)
+                }
+
+                // Show more / collapse overflow
+                if tasks.count > pageSize {
+                    Button {
+                        withAnimation(KisaniSpring.snappy) { showAll.toggle() }
+                    } label: {
+                        HStack(spacing: 5) {
+                            Text(showAll
+                                 ? "Show less"
+                                 : "\(tasks.count - pageSize) more")
+                                .font(AppFonts.mono(9.5, weight: .semibold))
+                                .foregroundColor(AppColors.accent)
+                            Image(systemName: showAll ? "chevron.up" : "chevron.down")
+                                .font(.system(size: 8, weight: .bold))
+                                .foregroundColor(AppColors.accent)
+                        }
+                        .padding(.horizontal, 18)
+                        .padding(.top, 2)
+                        .padding(.bottom, 4)
+                    }
+                    .buttonStyle(.plain)
+                }
+            }
+        }
+    }
+}
+
 // MARK: - Completed Today Section
 struct CompletedTodaySection: View {
     @Environment(\.colorScheme) private var cs