Fix memory leaks and add debug tools, remove ControlCenterTip

Memory optimization:
- Add onDisappear cleanup for repeatForever animations in LockScreenView
- Add onDisappear cleanup for animations in FeelsSubscriptionStoreView
- Add onDisappear cleanup in AddMoodHeaderView and PaywallPreviewSettingsView

Debug improvements:
- Add test data and clear data buttons to Settings (debug builds only)

TipKit changes:
- Remove ControlCenterTip (unused)
- Add TipKit-Tips.md documentation

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Shared/FeelsTips.swift

@@ -150,28 +150,6 @@ struct MoodStreakTip: Tip {
     static var currentStreak: Int = 0
 }
 
-/// Tip for Control Center widget
-struct ControlCenterTip: Tip {
-    var title: Text {
-        Text("Quick Access from Control Center")
-    }
-
-    var message: Text? {
-        Text("Add Feels to Control Center for one-tap mood logging from anywhere.")
-    }
-
-    var image: Image? {
-        Image(systemName: "slider.horizontal.3")
-    }
-
-    var rules: [Rule] {
-        #Rule(Self.$daysUsingApp) { $0 >= 5 }
-    }
-
-    @Parameter
-    static var daysUsingApp: Int = 0
-}
-
 // MARK: - Tips Manager
 
 @MainActor
@@ -203,7 +181,6 @@ class TipsManager {
 
     func updateDaysUsingApp(_ days: Int) {
         WidgetVotingTip.daysUsingApp = days
-        ControlCenterTip.daysUsingApp = days
     }
 
     func updateStreak(_ streak: Int) {
@@ -241,10 +218,6 @@ extension View {
     func moodStreakTip() -> some View {
         self.popoverTip(MoodStreakTip())
     }
-
-    func controlCenterTip() -> some View {
-        self.popoverTip(ControlCenterTip())
-    }
 }
 
 // MARK: - Inline Tip View