Add tooltip coach mark tutorial for new users

- TutorialManager: tracks 4 steps (NLP, Calendar, Matrix, Workout)
  persisted via AppStorage; shown once then never again
- TutorialView: fullscreen overlay with even-odd spotlight cutout,
  animated accent border, ultraThinMaterial callout card, pill progress
  dots, Next/Get started button, and Skip
- TutorialFrameKey: PreferenceKey collects CGRect for each anchor index;
  .tutorialAnchor() modifier wired to FAB (step 0) and all 4 tab buttons
- Callout auto-positions above or below the spotlight based on screen half
- ContentView collects frames via onPreferenceChange and layers the overlay

Co-Authored-By: Kutesir <tqwyy79vzn@privaterelay.appleid.com>

KisaniCal/ContentView.swift

@@ -14,6 +14,8 @@ struct ContentView: View {
     @State private var showQuickAddTask  = false
     @StateObject private var tabState    = FloatingTabState()
     @ObservedObject private var shortcuts = ShortcutHandler.shared
+    @ObservedObject private var tutorial  = TutorialManager.shared
+    @State private var tutorialFrames: [Int: CGRect] = [:]
     @State private var iPadSelection: Int? = 0
     @State private var calIconImage: Image = ContentView.buildCalIcon()
 
@@ -124,8 +126,7 @@ struct ContentView: View {
     @ViewBuilder
     private func iPhoneLayout() -> some View {
         ZStack(alignment: .bottom) {
-            TabView(selection: $selectedTab) {
-                TodayView()
+            TabView(selection: $selectedTab) {                TodayView()
                     .environmentObject(taskVM)
                     .environmentObject(workoutVM)
                     .tag(0)
@@ -170,7 +171,14 @@ struct ContentView: View {
                 showMatrix: showMatrixTab,
                 showWorkout: showWorkoutTab
             )
+
+            if tutorial.isActive {
+                TutorialOverlay(frames: tutorialFrames)
+                    .transition(.opacity)
+                    .zIndex(99)
+            }
         }
+        .onPreferenceChange(TutorialFrameKey.self) { tutorialFrames = $0 }
         .onAppear { UITabBar.appearance().isHidden = true }
     }
 
@@ -259,6 +267,7 @@ struct KisaniTabBar: View {
                     }
                     .frame(maxWidth: .infinity)
                     .frame(height: 52)
+                    .tutorialAnchor(entry.id)
                 }
                 .buttonStyle(PressButtonStyle(scale: 0.90))
             }