Refactor UI: move Splits to Settings, redesign ExerciseView

Schema & Models:
- Add notes, loadType, duration fields to WorkoutLog
- Align Watch schema with iOS (use duration Date instead of separate mins/secs)
- Add duration helper properties to Exercise and WorkoutLog

UI Changes:
- Remove Splits and Settings tabs, single Workout Logs view
- Add gear button in nav bar to access Settings as sheet
- Move Splits section into Settings view with inline list
- Redesign ExerciseView with read-only Plan/Notes tiles and Edit buttons
- Add PlanEditView and NotesEditView with Cancel/Save buttons
- Auto-dismiss ExerciseView when completing last set
- Navigate to ExerciseView when adding new exercise

Data Flow:
- Plan edits sync to both WorkoutLog and corresponding Exercise
- Changes propagate up navigation chain via CoreData

Workouts/Views/Settings/SettingsView.swift

@@ -6,17 +6,82 @@
 //
 
 import SwiftUI
+import CoreData
 import IndieAbout
 
 struct SettingsView: View {
+    @Environment(\.managedObjectContext) private var viewContext
+
+    @FetchRequest(
+        sortDescriptors: [
+            NSSortDescriptor(keyPath: \Split.order, ascending: true),
+            NSSortDescriptor(keyPath: \Split.name, ascending: true)
+        ],
+        animation: .default
+    )
+    private var splits: FetchedResults<Split>
+
+    @State private var showingAddSplitSheet = false
+
     var body: some View {
         NavigationStack {
             Form {
+                // MARK: - Splits Section
+                Section(header: Text("Splits")) {
+                    if splits.isEmpty {
+                        HStack {
+                            Spacer()
+                            VStack(spacing: 8) {
+                                Image(systemName: "dumbbell.fill")
+                                    .font(.largeTitle)
+                                    .foregroundColor(.secondary)
+                                Text("No Splits Yet")
+                                    .font(.headline)
+                                    .foregroundColor(.secondary)
+                                Text("Create a split to organize your workout routine.")
+                                    .font(.caption)
+                                    .foregroundColor(.secondary)
+                                    .multilineTextAlignment(.center)
+                            }
+                            .padding(.vertical)
+                            Spacer()
+                        }
+                    } else {
+                        ForEach(splits, id: \.objectID) { split in
+                            NavigationLink {
+                                SplitDetailView(split: split)
+                            } label: {
+                                HStack {
+                                    Image(systemName: split.systemImage)
+                                        .foregroundColor(Color.color(from: split.color))
+                                        .frame(width: 24)
+                                    Text(split.name)
+                                    Spacer()
+                                    Text("\(split.exercisesArray.count)")
+                                        .foregroundColor(.secondary)
+                                }
+                            }
+                        }
+                    }
+
+                    Button {
+                        showingAddSplitSheet = true
+                    } label: {
+                        HStack {
+                            Image(systemName: "plus.circle.fill")
+                                .foregroundColor(.accentColor)
+                            Text("Add Split")
+                        }
+                    }
+                }
+
+                // MARK: - Account Section
                 Section(header: Text("Account")) {
                     Text("Settings coming soon")
                         .foregroundColor(.secondary)
                 }
 
+                // MARK: - About Section
                 Section {
                     IndieAbout(configuration: AppInfoConfiguration(
                         documents: [
@@ -28,10 +93,14 @@ struct SettingsView: View {
                 }
             }
             .navigationTitle("Settings")
+            .sheet(isPresented: $showingAddSplitSheet) {
+                SplitAddEditView(split: nil)
+            }
         }
     }
 }
 
 #Preview {
     SettingsView()
+        .environment(\.managedObjectContext, PersistenceController.preview.viewContext)
 }