onboarding: animated feature icons

FuelBoard/OnboardingView.swift

@@ -85,7 +85,7 @@ struct OnboardingView: View {
     private var welcomePage: some View {
         VStack(spacing: 0) {
             Spacer()
-            ZStack {
+            AnimatedOnboardingIcon(tint: .accentColor) {
                 // The app icon itself, with the standard iOS rounded-corner
                 // treatment (~22% of the size), so onboarding matches the
                 // Home Screen.
@@ -122,8 +122,7 @@ struct OnboardingView: View {
     private var locationPage: some View {
         VStack(spacing: 0) {
             Spacer()
-            ZStack {
-                Circle().fill(Color.blue.opacity(0.12)).frame(width: 96, height: 96)
+            AnimatedOnboardingIcon(tint: .blue, motion: .locationArrow) {
                 Image(systemName: "location.fill")
                     .font(.system(size: 40, weight: .semibold))
                     .foregroundStyle(.blue)
@@ -154,8 +153,7 @@ struct OnboardingView: View {
     private var notificationsPage: some View {
         VStack(spacing: 0) {
             Spacer()
-            ZStack {
-                Circle().fill(Color.orange.opacity(0.12)).frame(width: 96, height: 96)
+            AnimatedOnboardingIcon(tint: .orange, motion: .alarmBell) {
                 Image(systemName: "bell.badge.fill")
                     .font(.system(size: 40, weight: .semibold))
                     .foregroundStyle(.orange)
@@ -186,8 +184,7 @@ struct OnboardingView: View {
     private var dataPage: some View {
         VStack(spacing: 0) {
             Spacer()
-            ZStack {
-                Circle().fill(Color.teal.opacity(0.12)).frame(width: 96, height: 96)
+            AnimatedOnboardingIcon(tint: .teal, motion: .downloadArrow) {
                 Image(systemName: "arrow.down.circle.fill")
                     .font(.system(size: 40, weight: .semibold))
                     .foregroundStyle(.teal)
@@ -326,6 +323,99 @@ struct OnboardingView: View {
     }
 }
 
+private struct AnimatedOnboardingIcon<Content: View>: View {
+    enum Motion {
+        case gentle
+        case locationArrow
+        case alarmBell
+        case downloadArrow
+    }
+
+    let tint: Color
+    var motion: Motion = .gentle
+    @ViewBuilder var content: Content
+
+    @State private var settled = false
+    @State private var iconRotation: Double = 0
+    @State private var iconOffsetY: CGFloat = 0
+    @State private var iconScale: CGFloat = 0.92
+
+    var body: some View {
+        ZStack {
+            Circle()
+                .fill(tint.opacity(0.10))
+                .frame(width: 108, height: 108)
+                .scaleEffect(settled ? 1.0 : 0.94)
+
+            Circle()
+                .stroke(tint.opacity(0.18), lineWidth: 1)
+                .frame(width: 118, height: 118)
+                .scaleEffect(settled ? 1.03 : 0.97)
+                .opacity(settled ? 1.0 : 0.55)
+
+            content
+                .scaleEffect(iconScale)
+                .rotationEffect(.degrees(iconRotation))
+                .offset(y: iconOffsetY)
+        }
+        .shadow(color: tint.opacity(0.12), radius: settled ? 12 : 4, y: settled ? 6 : 2)
+        .animation(.spring(response: 0.55, dampingFraction: 0.82), value: settled)
+        .onAppear {
+            playAnimation()
+        }
+    }
+
+    private func playAnimation() {
+        settled = false
+        iconRotation = 0
+        iconOffsetY = 4
+        iconScale = 0.92
+
+        switch motion {
+        case .gentle:
+            withAnimation(.spring(response: 0.55, dampingFraction: 0.82)) {
+                settled = true
+                iconOffsetY = 0
+                iconScale = 1.0
+            }
+
+        case .locationArrow:
+            iconRotation = -120
+            withAnimation(.linear(duration: 0.45)) {
+                settled = true
+                iconRotation = 24
+                iconOffsetY = 0
+                iconScale = 1.02
+            }
+            withAnimation(.spring(response: 0.45, dampingFraction: 0.62).delay(0.45)) {
+                iconRotation = 0
+                iconScale = 1.0
+            }
+
+        case .alarmBell:
+            settled = true
+            iconOffsetY = 0
+            iconScale = 1.0
+            withAnimation(.linear(duration: 0.10)) { iconRotation = -14 }
+            withAnimation(.linear(duration: 0.10).delay(0.10)) { iconRotation = 14 }
+            withAnimation(.linear(duration: 0.10).delay(0.20)) { iconRotation = -10 }
+            withAnimation(.linear(duration: 0.10).delay(0.30)) { iconRotation = 10 }
+            withAnimation(.spring(response: 0.34, dampingFraction: 0.72).delay(0.40)) { iconRotation = 0 }
+
+        case .downloadArrow:
+            iconOffsetY = -22
+            withAnimation(.easeIn(duration: 0.22)) {
+                settled = true
+                iconScale = 1.0
+                iconOffsetY = 8
+            }
+            withAnimation(.spring(response: 0.42, dampingFraction: 0.62).delay(0.22)) {
+                iconOffsetY = 0
+            }
+        }
+    }
+}
+
 /// Owns the system permission requests during onboarding and publishes
 /// their outcomes so the pages can reflect them live.
 @MainActor