chore: remove scraper, add docs, add marketing-videos gitignore

- Remove Scripts/ directory (scraper no longer needed)
- Add themed background documentation to CLAUDE.md
- Add .gitignore for marketing-videos to prevent node_modules tracking

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

CLAUDE.md

@@ -137,6 +137,30 @@ TripCreationView → TripCreationViewModel → PlanningRequest
 - CloudKit container ID: `iCloud.com.sportstime.app`
 - `PDFGenerator` and `ExportService` are `@MainActor final class` (not actors) because they access MainActor-isolated UI properties and use UIKit drawing
 
+### Themed Background System
+
+All views use `.themedBackground()` modifier for consistent backgrounds app-wide.
+
+**Components** (`Core/Theme/`):
+- `ThemedBackground` (ViewModifiers.swift) - Conditionally shows static gradient or animated background
+- `AnimatedSportsBackground` (AnimatedBackground.swift) - Floating sports icons with route lines
+- `DesignStyleManager.shared.animationsEnabled` - Toggle controlled in Settings
+
+**How it works:**
+```swift
+// All views apply this modifier - animation state is automatic
+.themedBackground()
+
+// The modifier checks DesignStyleManager internally:
+if DesignStyleManager.shared.animationsEnabled {
+    AnimatedSportsBackground()  // Floating icons + route lines
+} else {
+    Theme.backgroundGradient(colorScheme)  // Static gradient
+}
+```
+
+**Adding new screens:** Just apply `.themedBackground()` - no need to handle animation logic.
+
 ### iOS 26 API Notes
 
 **Deprecated APIs** (use with `@available(iOS, deprecated: 26.0)` annotation):