UI overhaul: new color palette, trip creation improvements, crash fix

Theme:
- New teal/cyan/mint/pink/gold color palette replacing orange/cream
- Added Theme.swift, ViewModifiers.swift, AnimatedComponents.swift

Trip Creation:
- Removed Drive/Fly toggle (drive-only for now)
- Removed Lodging Type picker
- Renamed "Number of Stops" to "Number of Cities" with explanation
- Added explanation for "Find Other Sports Along Route"
- Removed staggered animation from trip options list

Bug Fix:
- Disabled AI route description generation (Foundation Models crashes
  in iOS 26.2 Simulator due to NLLanguageRecognizer assertion failure)

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

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

SportsTime/Planning/Engine/GameDAGRouter.swift

@@ -352,6 +352,11 @@ enum GameDAGRouter {
     /// Scores a path. Higher = better.
     /// Prefers: more games, less driving, geographic coherence
     private static func scorePath(_ path: [Game], stadiums: [UUID: Stadium]) -> Double {
+        // Handle empty or single-game paths
+        guard path.count > 1 else {
+            return Double(path.count) * 100.0
+        }
+
         let gameCount = Double(path.count)
 
         // Calculate total driving