fix: remove page-swipe TabView — conflicts with swipe-to-delete

Replaced .tabViewStyle(.page) with Group/switch.
Tab switching only via top buttons, no horizontal page swipe.
This prevents swipe-to-delete from accidentally switching tabs.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

ios/Platform/Platform/Features/Fitness/Views/FitnessTabView.swift

@@ -31,18 +31,16 @@ struct FitnessTabView: View {
             .padding(.horizontal)
             .padding(.top, 8)
 
-            // Content
-            TabView(selection: $selectedSubTab) {
-                TodayView()
-                    .tag(0)
-                TemplatesView()
-                    .tag(1)
-                GoalsView()
-                    .tag(2)
-                FoodLibraryView()
-                    .tag(3)
+            // Content — no page swipe (conflicts with swipe-to-delete)
+            Group {
+                switch selectedSubTab {
+                case 0: TodayView()
+                case 1: TemplatesView()
+                case 2: GoalsView()
+                case 3: FoodLibraryView()
+                default: TodayView()
+                }
             }
-            .tabViewStyle(.page(indexDisplayMode: .never))
         }
         .background(Color.canvas)
         .navigationBarHidden(true)