feat: add planning tips and grouped trip options sorting

- Add PlanningTips data model with 105 tips across 7 categories
- Wire random tips into HomeView (3 tips per session)
- Add TripOptionsGrouper for grouping by city/game count and mileage
- Update TripOptionsView with sectioned display when sorting
- Recommended and Best Efficiency remain flat lists

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

SportsTime/Features/Trip/Views/TripCreationView.swift

@@ -1567,6 +1567,58 @@ enum CitiesFilter: Int, CaseIterable, Identifiable {
     }
 }
 
+// MARK: - Trip Options Grouper
+
+enum TripOptionsGrouper {
+    typealias GroupedOptions = (header: String, options: [ItineraryOption])
+
+    static func groupByCityCount(_ options: [ItineraryOption], ascending: Bool) -> [GroupedOptions] {
+        let grouped = Dictionary(grouping: options) { option in
+            Set(option.stops.map { $0.city }).count
+        }
+        let sorted = ascending ? grouped.sorted { $0.key < $1.key } : grouped.sorted { $0.key > $1.key }
+        return sorted.map { count, opts in
+            ("\(count) \(count == 1 ? "city" : "cities")", opts)
+        }
+    }
+
+    static func groupByGameCount(_ options: [ItineraryOption], ascending: Bool) -> [GroupedOptions] {
+        let grouped = Dictionary(grouping: options) { $0.totalGames }
+        let sorted = ascending ? grouped.sorted { $0.key < $1.key } : grouped.sorted { $0.key > $1.key }
+        return sorted.map { count, opts in
+            ("\(count) \(count == 1 ? "game" : "games")", opts)
+        }
+    }
+
+    static func groupByMileageRange(_ options: [ItineraryOption], ascending: Bool) -> [GroupedOptions] {
+        let ranges: [(min: Int, max: Int, label: String)] = [
+            (0, 500, "0-500 mi"),
+            (500, 1000, "500-1000 mi"),
+            (1000, 1500, "1000-1500 mi"),
+            (1500, 2000, "1500-2000 mi"),
+            (2000, Int.max, "2000+ mi")
+        ]
+
+        var groupedDict: [String: [ItineraryOption]] = [:]
+        for option in options {
+            let miles = Int(option.totalDistanceMiles)
+            for range in ranges {
+                if miles >= range.min && miles < range.max {
+                    groupedDict[range.label, default: []].append(option)
+                    break
+                }
+            }
+        }
+
+        // Sort by range order
+        let rangeOrder = ascending ? ranges : ranges.reversed()
+        return rangeOrder.compactMap { range in
+            guard let opts = groupedDict[range.label], !opts.isEmpty else { return nil }
+            return (range.label, opts)
+        }
+    }
+}
+
 struct TripOptionsView: View {
     let options: [ItineraryOption]
     let games: [String: RichGame]
@@ -1641,6 +1693,29 @@ struct TripOptionsView: View {
         return Double(option.totalGames) / Double(days)
     }
 
+    private var groupedOptions: [TripOptionsGrouper.GroupedOptions] {
+        switch sortOption {
+        case .recommended, .bestEfficiency:
+            // Flat list, no grouping
+            return [("", filteredAndSortedOptions)]
+
+        case .mostCities:
+            return TripOptionsGrouper.groupByCityCount(filteredAndSortedOptions, ascending: false)
+
+        case .mostGames:
+            return TripOptionsGrouper.groupByGameCount(filteredAndSortedOptions, ascending: false)
+
+        case .leastGames:
+            return TripOptionsGrouper.groupByGameCount(filteredAndSortedOptions, ascending: true)
+
+        case .mostMiles:
+            return TripOptionsGrouper.groupByMileageRange(filteredAndSortedOptions, ascending: false)
+
+        case .leastMiles:
+            return TripOptionsGrouper.groupByMileageRange(filteredAndSortedOptions, ascending: true)
+        }
+    }
+
     var body: some View {
         ScrollView {
             LazyVStack(spacing: 16) {
@@ -1660,21 +1735,43 @@ struct TripOptionsView: View {
                 filtersSection
                     .padding(.horizontal, Theme.Spacing.md)
 
-                // Options list
+                // Options list (grouped when applicable)
                 if filteredAndSortedOptions.isEmpty {
                     emptyFilterState
                         .padding(.top, Theme.Spacing.xl)
                 } else {
-                    ForEach(filteredAndSortedOptions) { option in
-                        TripOptionCard(
-                            option: option,
-                            games: games,
-                            onSelect: {
-                                selectedTrip = convertToTrip(option)
-                                showTripDetail = true
+                    ForEach(Array(groupedOptions.enumerated()), id: \.offset) { _, group in
+                        VStack(alignment: .leading, spacing: Theme.Spacing.sm) {
+                            // Section header (only if non-empty)
+                            if !group.header.isEmpty {
+                                HStack {
+                                    Text(group.header)
+                                        .font(.headline)
+                                        .foregroundStyle(Theme.textPrimary(colorScheme))
+
+                                    Spacer()
+
+                                    Text("\(group.options.count)")
+                                        .font(.subheadline)
+                                        .foregroundStyle(Theme.textMuted(colorScheme))
+                                }
+                                .padding(.horizontal, Theme.Spacing.md)
+                                .padding(.top, Theme.Spacing.md)
                             }
-                        )
-                        .padding(.horizontal, Theme.Spacing.md)
+
+                            // Options in this group
+                            ForEach(group.options) { option in
+                                TripOptionCard(
+                                    option: option,
+                                    games: games,
+                                    onSelect: {
+                                        selectedTrip = convertToTrip(option)
+                                        showTripDetail = true
+                                    }
+                                )
+                                .padding(.horizontal, Theme.Spacing.md)
+                            }
+                        }
                     }
                 }
             }