Update Neon colors and show color circles in theme picker

- Update NeonMoodTint to use synthwave colors matching Neon voting style
  (cyan, lime, yellow, orange, magenta)
- Replace text label with 5 color circles in theme preview Colors row
- Remove unused textColor customization code and picker views
- Add .id(moodTint) to Month/Year views for color refresh
- Clean up various unused color-related code

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

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

Shared/Views/YearView/YearViewModel.swift

@@ -16,6 +16,8 @@ class YearViewModel: ObservableObject {
     // year, month, items
     @Published public private(set) var data = [Int: [Int: [DayChartView]]]()
     @Published public private(set) var numberOfRatings: Int = 0
+    /// Entries organized by year for efficient access
+    @Published public private(set) var entriesByYear = [Int: [MoodEntryModel]]()
     public private(set) var uncategorizedData = [MoodEntryModel]() {
         didSet {
             self.numberOfRatings = uncategorizedData.count
@@ -44,8 +46,16 @@ class YearViewModel: ObservableObject {
                                                             endDate: endDate,
                                                             includedDays: selectedDays)
         data.removeAll()
+        entriesByYear.removeAll()
         let filledOutData = chartViewBuilder.buildGridData(withData: filteredEntries)
         data = filledOutData
         uncategorizedData = filteredEntries
+
+        // Organize entries by year for efficient access in YearCard
+        let calendar = Calendar.current
+        for entry in filteredEntries {
+            let year = calendar.component(.year, from: entry.forDate)
+            entriesByYear[year, default: []].append(entry)
+        }
     }
 }