Restore each task's open sheet when switching back

mac/Sources/Byre/Pages.swift

@@ -98,7 +98,7 @@ extension Store {
             case .project(let id): .project(id)
             }
             if sheet?.tab == .page, sheet?.owner == owner {
-                sheet = nil
+                _ = closeSheet()
             }
             return
         }

mac/Sources/Byre/Panes.swift

@@ -155,7 +155,7 @@ private struct LeftPane: View {
     private func pick(_ tab: LeftTab) {
         overlays.leftTab = tab
         if store.sheet?.owner != .lead {
-            store.sheet = nil
+            _ = store.closeSheet()
         }
     }
 }

mac/Sources/Byre/Phone.swift

@@ -131,7 +131,7 @@ struct PhoneView: View {
         }
         .fullScreenCover(isPresented: Binding(get: { zoomed != nil }, set: { shown in
             if !shown {
-                store.sheet = nil
+                _ = store.closeSheet()
             }
         })) {
             if let zoomed {
@@ -240,7 +240,7 @@ private struct ZoomedView: View {
             HStack {
                 Spacer()
                 Button("Done") {
-                    store.sheet = nil
+                    _ = store.closeSheet()
                 }
                 .font(Fonts.font(15, weight: 700))
                 .padding(.horizontal, 16)

mac/Sources/Byre/Sheet.swift

@@ -57,7 +57,7 @@ struct SheetHost: View {
             .frame(width: stripWidth)
             .contentShape(Rectangle())
             .onTapGesture {
-                store.sheet = nil
+                _ = store.closeSheet()
             }
             .help("Close")
     }
@@ -96,7 +96,7 @@ private struct SheetPanel: View {
                     .help("Open the page in the default browser")
                 }
                 Button {
-                    store.sheet = nil
+                    _ = store.closeSheet()
                 } label: {
                     Text("✕")
                         .font(Fonts.font(13, weight: 700))

mac/Sources/Byre/Store.swift

@@ -82,7 +82,14 @@ final class Store {
     var pinned: Int?
     var connected = false
     private(set) var focus = Focus()
-    var sheet: Sheet?
+    var sheet: Sheet? {
+        didSet {
+            if case .task(let taskId?) = sheet?.owner {
+                taskSheets[taskId] = sheet
+            }
+        }
+    }
+    private var taskSheets: [String: Sheet] = [:]
     var shownPages: [FileRoot: ShownPages] = [:]
     var projectTab = ProjectTab.tasks
     var leadSessions: [AgentSession] = []
@@ -567,7 +574,10 @@ final class Store {
 
     func openTab(_ tab: TaskTab) {
         if tab == primaryTab || sheet?.tab == tab {
-            sheet = nil
+            if let selectedTaskId {
+                taskSheets[selectedTaskId] = nil
+            }
+            _ = closeSheet()
             return
         }
         sheet = Sheet(owner: .task(selectedTaskId), view: .tab(tab))
@@ -581,6 +591,9 @@ final class Store {
         if sheet == nil {
             return false
         }
+        if case .task(let taskId?) = sheet?.owner {
+            taskSheets[taskId] = nil
+        }
         sheet = nil
         return true
     }
@@ -750,12 +763,14 @@ final class Store {
     }
 
     func selectTask(_ taskId: String?) {
-        if case .task(let owner)? = sheet?.owner, owner != taskId {
-            sheet = nil
-        }
+        let changed = taskId != selectedTaskId
         markVisited(selectedTaskId)
         markVisited(taskId)
         selectedTaskId = taskId
+        // A link can already have opened a specific view for the incoming task.
+        if changed, sheet?.owner != .lead, sheet == nil || sheet?.owner != .task(taskId) {
+            sheet = taskId.flatMap { taskSheets[$0] }
+        }
         if let taskId {
             lookUpTask(taskId)
             _ = taskFeed(taskId)

mac/Sources/Byre/Switcher.swift

@@ -30,7 +30,7 @@ func runGo(_ key: String, _ store: Store, _ overlays: Overlays) {
         }
     case "l":
         overlays.switcher?.close()
-        store.sheet = nil
+        _ = store.closeSheet()
         overlays.leftTab = .lead
         overlays.leadFocus += 1
     case "s":