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/WorkoutLogs/NotesEditView.swift

@@ -0,0 +1,52 @@
+//
+// NotesEditView.swift
+// Workouts
+//
+// Copyright 2025 Rouslan Zenetl. All Rights Reserved.
+//
+
+import SwiftUI
+import CoreData
+
+struct NotesEditView: View {
+    @Environment(\.managedObjectContext) private var viewContext
+    @Environment(\.dismiss) private var dismiss
+
+    @ObservedObject var workoutLog: WorkoutLog
+
+    @State private var notesText: String = ""
+
+    var body: some View {
+        NavigationStack {
+            Form {
+                Section {
+                    TextEditor(text: $notesText)
+                        .frame(minHeight: 200)
+                }
+            }
+            .navigationTitle("Edit Notes")
+            .navigationBarTitleDisplayMode(.inline)
+            .toolbar {
+                ToolbarItem(placement: .cancellationAction) {
+                    Button("Cancel") {
+                        dismiss()
+                    }
+                }
+                ToolbarItem(placement: .confirmationAction) {
+                    Button("Save") {
+                        saveChanges()
+                        dismiss()
+                    }
+                }
+            }
+            .onAppear {
+                notesText = workoutLog.notes ?? ""
+            }
+        }
+    }
+
+    private func saveChanges() {
+        workoutLog.notes = notesText
+        try? viewContext.save()
+    }
+}