Chat View Refinement

Nucleic-Session: 4E56990A-96AE-4597-9140-753CB82E769D
Co-authored-by: Nucleic <[email protected]>

NucleicRemote/NucleicRemote/Views/SessionDetailView.swift

@@ -131,9 +131,54 @@ struct SessionDetailView: View {
         }
     }
 
+    /// The ⋯ menu: the diff viewer for everyone, then the control-scope session actions.
     @ViewBuilder
-    private func sessionMenu(_ summary: WireSessionSummary) -> some View {
+    private var sessionMenu: some View {
         Menu {
+            Button { showDiff = true } label: {
+                Label(diffLabel, systemImage: "plus.forwardslash.minus")
+            }
+            if let summary, store.canControl {
+                Divider()
+                sessionActions(summary)
+            }
+        } label: {
+            Image(systemName: "ellipsis.circle")
+        }
+    }
+
+    /// "View changes" with the live +/− counts when the host projects them, so the menu hints
+    /// whether there's anything to look at before opening the sheet.
+    private var diffLabel: String {
+        guard let stat = summary?.diffStat, stat.filesChanged > 0 else { return "View changes" }
+        return "View changes · +\(stat.added) −\(stat.removed)"
+    }
+
+    /// The diff, presented as a sheet from the ⋯ menu — a viewer you visit, not a mode the
+    /// chat lives in.
+    private var diffSheet: some View {
+        NavigationStack {
+            Group {
+                if store.capabilities.canFetchDiff || store.openDiff != nil {
+                    SessionDiffView(diff: store.openDiff, loading: store.diffLoading)
+                        .onAppear { store.fetchDiff(sessionID) }
+                } else {
+                    // Older host with no on-demand diff — the stat summary is all it projects.
+                    DiffSummaryView(diffStat: summary?.diffStat)
+                }
+            }
+            .navigationTitle("Changes")
+            .navigationBarTitleDisplayMode(.inline)
+            .toolbar {
+                ToolbarItem(placement: .topBarTrailing) {
+                    Button("Done") { showDiff = false }
+                }
+            }
+        }
+    }
+
+    @ViewBuilder
+    private func sessionActions(_ summary: WireSessionSummary) -> some View {
             Button { renameDraft = summary.title; showRename = true } label: {
                 Label("Rename", systemImage: "pencil")
             }