Replace TipKit with custom themed tips modal system

- Add TipModalView with gradient header, themed styling, and spring animations
- Create FeelsTipsManager with global toggle, session tracking, and persistence
- Define FeelsTip protocol and convert all 7 tips to new system
- Add convenience view modifiers (.customizeLayoutTip(), .aiInsightsTip(), etc.)
- Remove TipKit dependency from all views
- Add Tips Preview debug screen in Settings to test all tip modals
- Update documentation for new custom tips system

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

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

docs/Apple-Features.md

@@ -109,38 +109,42 @@ This document covers the new Apple-specific features integrated into Feels, incl
 
 ---
 
-## 4. TipKit
+## 4. Custom Tips System
 
-**File:** `Shared/FeelsTips.swift`
+**Files:**
+- `Shared/FeelsTips.swift` (Tips definitions and manager)
+- `Shared/Views/TipModalView.swift` (Modal UI)
 
-**What it does:** Shows contextual tips to help users discover features throughout the app.
+**What it does:** Shows themed modal tips to help users discover features throughout the app. Tips appear as beautiful sheets that match the app's current theme.
 
 ### Available Tips
 
 | Tip | Location | Trigger |
 |-----|----------|---------|
 | CustomizeLayoutTip | Customize screen | First visit |
-| AIInsightsTip | Insights tab | After 7 days of data |
+| AIInsightsTip | Insights tab | After 7 moods logged |
 | SiriShortcutTip | Settings | After 3 mood logs |
-| HealthKitSyncTip | Settings | After 5 mood logs |
-| WidgetVotingTip | Day view | After first mood log |
-| TimeViewTip | Day view header | After 2 days usage |
+| HealthKitSyncTip | Settings | After viewing settings |
+| WidgetVotingTip | Day view | After 2 days usage |
+| TimeViewTip | Day view | First visit |
 | MoodStreakTip | Day view | When streak >= 3 |
 
 ### How to Test
-1. Tips appear automatically based on conditions
-2. To reset tips for testing, add this code temporarily:
+1. Tips appear automatically based on conditions (one per session)
+2. To reset tips for testing:
 ```swift
-try? Tips.resetDatastore()
+FeelsTipsManager.shared.resetAllTips()
+```
+3. To disable tips globally:
+```swift
+FeelsTipsManager.shared.tipsEnabled = false
 ```
-3. Or use the Tips debug menu in Xcode:
-   - Edit Scheme > Run > Arguments
-   - Add: `-com.apple.TipKit.DisplayFrequency weekly`
 
 ### Implementation Details
-- `TipsManager.shared.configure()` called in `FeelsApp.init()`
-- Each tip has rules based on `@Parameter` events and conditions
-- Tips automatically dismiss after user interaction
+- `FeelsTipsManager.shared.resetSession()` called in `FeelsApp.init()`
+- Each tip has `isEligible` property based on user activity parameters
+- Tips show as themed modal sheets with gradient headers
+- Only one tip shown per app session
 
 ---