fix(collections): show collection name in toolbar, highlight open doc

.navigationTitle set to a real value duplicated the custom toolbar
pill (macOS renders both in the same row); the previous attempt to
suppress just the native text via .windowToolbarStyle(showsTitle:
false) also suppressed the custom .navigation item itself. Empty
title sidesteps both.

Also threads the open document's id down through the sidebar tree so
its row highlights too, not just the containing collection — and
auto-expands whichever collection contains it when the document was
opened from outside the sidebar (detail pane, global search).

Outpost/Features/Collections/CollectionDocumentsOutline.swift

@@ -9,6 +9,7 @@ struct CollectionDocumentsOutline: View {
     @State private var viewModel: DocumentsViewModel
     let sortOption: SidebarSortOption
     let refreshToken: Int
+    let selectedDocumentID: String?
     let onSelectDocument: (OutlineDocument) -> Void
 
     private var tree: [DocumentNode] {
@@ -20,11 +21,13 @@ struct CollectionDocumentsOutline: View {
         collection: OutlineCollection,
         sortOption: SidebarSortOption,
         refreshToken: Int,
+        selectedDocumentID: String?,
         onSelectDocument: @escaping (OutlineDocument) -> Void
     ) {
         _viewModel = State(initialValue: DocumentsViewModel(apiClient: apiClient, collection: collection))
         self.sortOption = sortOption
         self.refreshToken = refreshToken
+        self.selectedDocumentID = selectedDocumentID
         self.onSelectDocument = onSelectDocument
     }
 
@@ -41,7 +44,12 @@ struct CollectionDocumentsOutline: View {
                     .padding(.vertical, 6)
             } else {
                 ForEach(tree) { node in
-                    DocumentNodeRow(node: node, depth: 0, onSelectDocument: onSelectDocument)
+                    DocumentNodeRow(
+                        node: node,
+                        depth: 0,
+                        selectedDocumentID: selectedDocumentID,
+                        onSelectDocument: onSelectDocument
+                    )
                 }
             }
         }
@@ -52,10 +60,22 @@ struct CollectionDocumentsOutline: View {
 private struct DocumentNodeRow: View {
     let node: DocumentNode
     let depth: Int
+    let selectedDocumentID: String?
     let onSelectDocument: (OutlineDocument) -> Void
 
     @State private var isExpanded = false
 
+    private var isSelected: Bool {
+        node.id == selectedDocumentID
+    }
+
+    private func containsSelected(_ node: DocumentNode) -> Bool {
+        guard let selectedDocumentID else { return false }
+        return node.children.contains {
+            $0.id == selectedDocumentID || containsSelected($0)
+        }
+    }
+
     var body: some View {
         VStack(alignment: .leading, spacing: 0) {
             HStack(spacing: 6) {
@@ -97,14 +117,33 @@ private struct DocumentNodeRow: View {
                 .buttonStyle(.plain)
             }
             .padding(.vertical, 6)
+            .padding(.horizontal, 4)
             .padding(.leading, CGFloat(depth) * 16)
+            .background(
+                isSelected ? Color.accentColor.opacity(0.15) : Color.clear,
+                in: RoundedRectangle(cornerRadius: 6)
+            )
 
             if isExpanded {
                 ForEach(node.children) { child in
-                    DocumentNodeRow(node: child, depth: depth + 1, onSelectDocument: onSelectDocument)
+                    DocumentNodeRow(
+                        node: child,
+                        depth: depth + 1,
+                        selectedDocumentID: selectedDocumentID,
+                        onSelectDocument: onSelectDocument
+                    )
                 }
             }
         }
+        // Reveals the selected document if it's nested under this node —
+        // both on first appearance and whenever the selection changes — but
+        // never auto-collapses on the way out, so manual expand/collapse
+        // elsewhere in the tree isn't fought.
+        .task(id: selectedDocumentID) {
+            if containsSelected(node) {
+                isExpanded = true
+            }
+        }
     }
 }
 #endif

Outpost/Features/Collections/CollectionTreeRow.swift

@@ -7,6 +7,7 @@ struct CollectionTreeRow: View {
     let collection: OutlineCollection
     let isExpanded: Bool
     let isSelected: Bool
+    let selectedDocumentID: String?
     let onToggle: () -> Void
     let onSelectDocument: (OutlineDocument) -> Void
     let onSearchInCollection: (OutlineCollection) -> Void
@@ -52,6 +53,7 @@ struct CollectionTreeRow: View {
                     collection: collection,
                     sortOption: sortOption,
                     refreshToken: documentsRefreshToken,
+                    selectedDocumentID: selectedDocumentID,
                     onSelectDocument: onSelectDocument
                 )
                 .padding(.leading, 18)

Outpost/Features/Collections/CollectionsTreeView.swift

@@ -5,6 +5,7 @@ import OutlineKit
 struct CollectionsTreeView: View {
     @State private var viewModel: CollectionsViewModel
     @Binding private var selectedCollection: OutlineCollection?
+    let selectedDocumentID: String?
     @State private var expandedCollectionIDs: Set<String> = []
     let onSelectDocument: (OutlineCollection, OutlineDocument) -> Void
     let onSearchInCollection: (OutlineCollection) -> Void
@@ -12,11 +13,13 @@ struct CollectionsTreeView: View {
     init(
         apiClient: OutlineAPIClient,
         selectedCollection: Binding<OutlineCollection?>,
+        selectedDocumentID: String?,
         onSelectDocument: @escaping (OutlineCollection, OutlineDocument) -> Void,
         onSearchInCollection: @escaping (OutlineCollection) -> Void
     ) {
         _viewModel = State(initialValue: CollectionsViewModel(apiClient: apiClient))
         _selectedCollection = selectedCollection
+        self.selectedDocumentID = selectedDocumentID
         self.onSelectDocument = onSelectDocument
         self.onSearchInCollection = onSearchInCollection
     }
@@ -50,6 +53,7 @@ struct CollectionsTreeView: View {
                             collection: collection,
                             isExpanded: expandedCollectionIDs.contains(collection.id),
                             isSelected: selectedCollection?.id == collection.id,
+                            selectedDocumentID: selectedDocumentID,
                             onToggle: { toggle(collection) },
                             onSelectDocument: { document in onSelectDocument(collection, document) },
                             onSearchInCollection: onSearchInCollection,
@@ -69,6 +73,13 @@ struct CollectionsTreeView: View {
                 selectedCollection = first
             }
         }
+        // A document opened from outside the sidebar (detail pane's list,
+        // global search) wouldn't otherwise expand its collection here, so
+        // the highlighted row would stay hidden.
+        .task(id: selectedDocumentID) {
+            guard selectedDocumentID != nil, let selectedCollection else { return }
+            expandedCollectionIDs.insert(selectedCollection.id)
+        }
     }
 
     private func toggle(_ collection: OutlineCollection) {

Outpost/Features/Collections/ContentView_macOS.swift

@@ -14,20 +14,6 @@ struct ContentView_macOS: View {
         globalSearchQuery.trimmingCharacters(in: .whitespacesAndNewlines)
     }
 
-    /// Mirrors leadingToolbarContent's priority (search > document > collection
-    /// > workspace) so the actual window title and the custom pill agree.
-    private var windowTitle: String {
-        if !trimmedGlobalQuery.isEmpty {
-            return "Search"
-        } else if let currentDocument = documentPath.last {
-            return currentDocument.title.isEmpty ? "Untitled" : currentDocument.title
-        } else if let selectedCollection {
-            return selectedCollection.name
-        } else {
-            return session.teamName ?? "Outpost"
-        }
-    }
-
     var body: some View {
         NavigationSplitView {
             VStack(spacing: 0) {
@@ -40,10 +26,13 @@ struct ContentView_macOS: View {
         } detail: {
             detail
         }
-        // Was hardcoded to the team name and never updated — the actual macOS
-        // window title (separate from the leadingToolbarContent pill below)
-        // stayed on the workspace name even with a collection/document open.
-        .navigationTitle(windowTitle)
+        // Empty rather than `windowTitle`: with a real value, the native title
+        // rendered in the same toolbar row as the custom `.navigation` pill
+        // below, visibly duplicating it. `.windowToolbarStyle(showsTitle:
+        // false)` was tried to suppress just the native text, but it also
+        // suppressed the custom `.navigation` item itself — an empty title
+        // sidesteps both problems (Window-menu entry is blank as a result).
+        .navigationTitle("")
         .toolbar {
             // Per HIG: "sidebar-toggle/back controls appear at the far leading
             // edge, followed by the view title" — this is that title, not
@@ -112,6 +101,7 @@ struct ContentView_macOS: View {
             CollectionsTreeView(
                 apiClient: apiClient,
                 selectedCollection: $selectedCollection,
+                selectedDocumentID: documentPath.last?.id,
                 onSelectDocument: selectDocument,
                 onSearchInCollection: searchInCollection
             )