feat: add MindDump button and improve new list button

MindDump/ContentView.swift

@@ -1,13 +1,18 @@
 import SwiftUI
 
 struct ContentView: View {
+    @State private var navigationPath: [UUID] = []
+
     var body: some View {
-        NavigationStack {
+        ZStack(alignment: .bottomTrailing) {
+            NavigationStack(path: $navigationPath) {
                 ListsOverviewView()
                     .navigationDestination(for: UUID.self) { listID in
                         ListDetailView(listID: listID)
                     }
             }
+            MindDumpButton(activeListID: navigationPath.last)
+        }
     }
 }
 

MindDump/ViewModels/ListStore.swift

@@ -5,6 +5,10 @@ import Observation
 class ListStore {
     var lists: [TodoList]
 
+    var inboxID: UUID {
+        lists.first { $0.isInbox }!.id
+    }
+
     init() {
         self.lists = [TodoList(name: "Inbox", isInbox: true)]
     }

MindDump/Views/ListDetailView.swift

@@ -4,7 +4,6 @@ struct ListDetailView: View {
     @Environment(ListStore.self) private var store
     let listID: UUID
     @State private var editorItem: TodoItem?
-    @State private var showingEditor = false
 
     private var todoList: TodoList? {
         store.lists.first { $0.id == listID }
@@ -22,7 +21,6 @@ struct ListDetailView: View {
                                 store.toggleItemCompleted(item.id, in: listID)
                             }, onTap: {
                                 editorItem = item
-                                showingEditor = true
                             })
                         }
                         .onDelete { offsets in
@@ -35,18 +33,8 @@ struct ListDetailView: View {
             }
         }
         .navigationTitle(todoList?.name ?? "")
-        .toolbar {
+        .sheet(item: $editorItem) { item in
-            ToolbarItem(placement: .primaryAction) {
+            TodoEditorView(listID: listID, item: item)
-                Button(action: {
-                    editorItem = nil
-                    showingEditor = true
-                }) {
-                    Image(systemName: "plus")
-                }
-            }
-        }
-        .sheet(isPresented: $showingEditor) {
-            TodoEditorView(listID: listID, item: editorItem)
         }
     }
 }

MindDump/Views/ListsOverviewView.swift

@@ -18,15 +18,13 @@ struct ListsOverviewView: View {
                 }
             }
             .onDelete(perform: deleteLists)
+
+            Button(action: { showingAddList = true }) {
+                Label("Neue Liste", systemImage: "plus")
+                    .foregroundStyle(.blue)
+            }
         }
         .navigationTitle("MindDump")
-        .toolbar {
-            ToolbarItem(placement: .primaryAction) {
-                Button(action: { showingAddList = true }) {
-                    Image(systemName: "plus")
-                }
-            }
-        }
         .alert("Neue Liste", isPresented: $showingAddList) {
             TextField("Name", text: $newListName)
             Button("Abbrechen", role: .cancel) {

MindDump/Views/MindDumpButton.swift

@@ -0,0 +1,27 @@
+import SwiftUI
+
+struct MindDumpButton: View {
+    @Environment(ListStore.self) private var store
+    var activeListID: UUID?
+    @State private var showingEditor = false
+
+    private var targetListID: UUID {
+        activeListID ?? store.inboxID
+    }
+
+    var body: some View {
+        Button {
+            showingEditor = true
+        } label: {
+            Text("🧠")
+                .font(.system(size: 28))
+                .frame(width: 56, height: 56)
+                .background(Circle().fill(.blue))
+                .shadow(color: .black.opacity(0.3), radius: 4, x: 0, y: 2)
+        }
+        .padding(24)
+        .sheet(isPresented: $showingEditor) {
+            TodoEditorView(listID: targetListID, item: nil)
+        }
+    }
+}