Make review and log panes resizable

Sources/GrowthLapse/ContentView.swift

@@ -231,10 +231,17 @@ struct ContentView: View {
                     .progressViewStyle(.linear)
 
                 if let project = processor.project {
-                    projectReviewPanel(project)
-                }
+                    VSplitView {
+                        projectReviewPanel(project)
+                            .frame(minHeight: 260)
 
-                logView
+                        logView
+                            .frame(minHeight: 160)
+                    }
+                }
+                else {
+                    logView
+                }
             }
             .padding()
             .frame(minWidth: 520)