fix: widget iOS 17 deployment target + register FloatingTabState

- Widget extension: 16.0 → 17.0 (containerBackground/widget API require 17)
- xcodegen re-run picks up FloatingTabState.swift (was on disk but
  not registered in project.pbxproj after previous xcodegen run)

KisaniCal/Components/FloatingTabState.swift

@@ -0,0 +1,52 @@
+import SwiftUI
+
+@MainActor
+final class FloatingTabState: ObservableObject {
+    @Published private(set) var isCollapsed = false
+    private var lastY: CGFloat = 0
+
+    func report(scrollY: CGFloat) {
+        let delta = scrollY - lastY
+        guard abs(delta) > 1.5 else { return }
+        let shouldCollapse = delta < 0  // content Y decreases → user scrolling down
+        lastY = scrollY
+        guard shouldCollapse != isCollapsed else { return }
+        withAnimation(KisaniSpring.snappy) {
+            isCollapsed = shouldCollapse
+        }
+    }
+
+    func resetOffset() {
+        lastY = 0
+    }
+}
+
+// MARK: — Scroll tracker
+
+private struct ScrollYKey: PreferenceKey {
+    static let defaultValue: CGFloat = 0
+    static func reduce(value: inout CGFloat, nextValue: () -> CGFloat) { value = nextValue() }
+}
+
+private struct TabBarScrollModifier: ViewModifier {
+    @EnvironmentObject private var tabState: FloatingTabState
+
+    func body(content: Content) -> some View {
+        content
+            .background(
+                GeometryReader { geo in
+                    Color.clear
+                        .preference(key: ScrollYKey.self, value: geo.frame(in: .global).minY)
+                }
+            )
+            .onPreferenceChange(ScrollYKey.self) { y in
+                tabState.report(scrollY: y)
+            }
+    }
+}
+
+extension View {
+    func trackScrollForTabBar() -> some View {
+        modifier(TabBarScrollModifier())
+    }
+}

KisaniCal/ContentView.swift

@@ -11,6 +11,7 @@ struct ContentView: View {
     @AppStorage("hasOnboarded")    private var hasOnboarded    = false
     @State private var showOnboarding = false
     @State private var selectedTab    = 0
+    @StateObject private var tabState  = FloatingTabState()
     @State private var iPadSelection: Int? = 0
     @State private var calIconImage: Image = ContentView.buildCalIcon()
 
@@ -135,16 +136,19 @@ struct ContentView: View {
                     .tabBarInset()
             }
             .tint(AppColors.accent)
+            .onChange(of: selectedTab) { _ in tabState.resetOffset() }
 
             KisaniTabBar(
                 selection: $selectedTab,
                 calIcon: calIconImage,
                 showMatrix: showMatrixTab,
-                showWorkout: showWorkoutTab
+                showWorkout: showWorkoutTab,
+                isCollapsed: tabState.isCollapsed
             )
             .padding(.horizontal, 24)
             .padding(.bottom, 8)
         }
+        .environmentObject(tabState)
         .onAppear { UITabBar.appearance().isHidden = true }
     }
 
@@ -191,6 +195,7 @@ struct KisaniTabBar: View {
     let calIcon: Image
     var showMatrix: Bool
     var showWorkout: Bool
+    var isCollapsed: Bool = false
     @Environment(\.colorScheme) private var cs
 
     private struct Entry: Identifiable {
@@ -224,15 +229,15 @@ struct KisaniTabBar: View {
                         }
                         if let img = entry.custom {
                             img
-                                .font(.system(size: 20))
+                                .font(.system(size: isCollapsed ? 17 : 20))
                                 .foregroundColor(selection == entry.id ? AppColors.accent : AppColors.text(cs))
                         } else if let icon = entry.sfIcon {
                             Image(systemName: icon)
-                                .font(.system(size: 17, weight: selection == entry.id ? .semibold : .regular))
+                                .font(.system(size: isCollapsed ? 15 : 17, weight: selection == entry.id ? .semibold : .regular))
                                 .foregroundColor(selection == entry.id ? AppColors.accent : AppColors.text(cs))
                         }
                     }
-                    .frame(maxWidth: .infinity).frame(height: 50)
+                    .frame(maxWidth: .infinity).frame(height: isCollapsed ? 38 : 50)
                 }
                 .buttonStyle(PressButtonStyle(scale: 0.88))
             }
@@ -241,8 +246,9 @@ struct KisaniTabBar: View {
         .background(
             RoundedRectangle(cornerRadius: 28)
                 .fill(AppColors.surface(cs))
-                .shadow(color: .black.opacity(0.10), radius: 20, x: 0, y: 6)
+                .shadow(color: .black.opacity(isCollapsed ? 0.06 : 0.10), radius: 20, x: 0, y: 6)
                 .shadow(color: .black.opacity(0.04), radius: 4,  x: 0, y: 1)
         )
+        .animation(KisaniSpring.snappy, value: isCollapsed)
     }
 }

KisaniCal/Views/MatrixView.swift

@@ -128,6 +128,7 @@ struct QuadrantCard: View {
             // ── Scrollable task list ──
             ScrollView(showsIndicators: false) {
                 VStack(alignment: .leading, spacing: 0) {
+                    Color.clear.frame(height: 0).trackScrollForTabBar()
                     ForEach(tasks) { task in
                         HStack(alignment: .top, spacing: 6) {
                             RoundedRectangle(cornerRadius: 3)

KisaniCal/Views/SettingsView.swift

@@ -44,6 +44,7 @@ struct SettingsView: View {
             AppColors.background(cs).ignoresSafeArea()
             ScrollView(showsIndicators: false) {
                 VStack(spacing: 0) {
+                    Color.clear.frame(height: 0).trackScrollForTabBar()
 
                     Text("Settings")
                         .font(AppFonts.sans(15, weight: .semibold))

KisaniCal/Views/TodayView.swift

@@ -18,6 +18,7 @@ struct TodayView: View {
 
             ScrollView(showsIndicators: false) {
                 VStack(alignment: .leading, spacing: 0) {
+                    Color.clear.frame(height: 0).trackScrollForTabBar()
 
                     // ── Header ──
                     HStack {

KisaniCal/Views/WorkoutView.swift

@@ -710,6 +710,7 @@ struct ManageWorkoutsSheet: View {
 
             ScrollView(showsIndicators: false) {
                 VStack(alignment: .leading, spacing: 20) {
+                    Color.clear.frame(height: 0).trackScrollForTabBar()
                     VStack(alignment: .leading, spacing: 8) {
                         Text("PROGRAMS").font(AppFonts.mono(9, weight: .bold)).foregroundColor(AppColors.text3(cs))