Add a Page tab that keeps the last shown page reachable

mac/Sources/Byre/Pages.swift

@@ -40,7 +40,8 @@ func isPage(_ path: String) -> Bool {
 
 extension Store {
     func openPage(_ page: Page) {
-        sheet = Sheet(owner: .task(page.taskId), view: .page(page))
+        shownPages[page.taskId] = page
+        sheet = Sheet(owner: .task(page.taskId), view: .tab(.page))
     }
 }
 

mac/Sources/Byre/Panes.swift

@@ -7,6 +7,7 @@ let tabLabels: [TaskTab: String] = [
     .board: "Board",
     .changes: "Changes",
     .files: "Files",
+    .page: "Page",
     .terminal: "Terminal",
     .workflow: "Workflow",
     .project: "Project",
@@ -230,6 +231,10 @@ struct TaskTabBody: View {
             ChangesView()
         case .files:
             FilesView()
+        case .page:
+            if let page = store.selectedTaskId.flatMap({ store.shownPages[$0] }) {
+                PageView(page: page)
+            }
         case .terminal:
             TerminalTab()
         case .workflow:
@@ -385,6 +390,7 @@ private struct TabStrip: View {
             }
             switch t {
             case .board: return team
+            case .page: return store.shownPages[taskId] != nil
             case .workflow: return false
             default: return true
             }

mac/Sources/Byre/Sheet.swift

@@ -5,7 +5,6 @@ enum SheetView {
     case tab(TaskTab)
     case image(NSImage)
     case diagram(BoxLayout)
-    case page(Page)
 }
 
 struct Sheet {
@@ -82,7 +81,7 @@ private struct SheetPanel: View {
                     .lineLimit(1)
                     .truncationMode(.tail)
                 Spacer(minLength: 0)
-                if case .page(let page) = sheet.view, let url = page.url(store) {
+                if sheet.tab == .page, let page = store.selectedTaskId.flatMap({ store.shownPages[$0] }), let url = page.url(store) {
                     Button {
                         NSWorkspace.shared.open(url)
                     } label: {
@@ -129,7 +128,6 @@ private struct SheetPanel: View {
         case .tab(let t): tabLabels[t]!
         case .image: "Image"
         case .diagram: "Diagram"
-        case .page(let page): page.title(store)
         }
         if !overLeft {
             return "Lead · \(label)"
@@ -159,8 +157,6 @@ private struct SheetPanel: View {
             DiagramViewer(layout: layout)
                 .id(layout.id)
                 .padding(12)
-        case .page(let page):
-            PageView(page: page)
         }
     }
 }

mac/Sources/Byre/Store.swift

@@ -3,10 +3,10 @@ import Observation
 import SwiftData
 
 enum TaskTab: String {
-    case transcript, board, changes, files, terminal, workflow, project
+    case transcript, board, changes, files, page, terminal, workflow, project
 }
 
-let taskTabs: [TaskTab] = [.transcript, .board, .changes, .files, .terminal, .workflow, .project]
+let taskTabs: [TaskTab] = [.transcript, .board, .changes, .files, .page, .terminal, .workflow, .project]
 
 enum JumpTarget: Equatable {
     case question(String)
@@ -71,6 +71,7 @@ final class Store {
     var connected = false
     private(set) var focus = Focus()
     var sheet: Sheet?
+    var shownPages: [String: Page] = [:]
     var leadSessions: [AgentSession] = []
     let leadFeed: Feed
     var jump: Jump?