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/MoodLogger.swift

@@ -147,25 +147,9 @@ final class MoodLogger {
         return targetDay == lastDay
     }
 
-    /// Calculate the current mood streak
+    /// Calculate the current mood streak using optimized batch query
     private func calculateCurrentStreak() -> Int {
-        var streak = 0
-        var checkDate = ShowBasedOnVoteLogics.getCurrentVotingDate(onboardingData: UserDefaultsStore.getOnboarding())
-
-        while true {
-            let dayStart = Calendar.current.startOfDay(for: checkDate)
-            let dayEnd = Calendar.current.date(bySettingHour: 23, minute: 59, second: 59, of: dayStart)!
-
-            let entry = DataController.shared.getData(startDate: dayStart, endDate: dayEnd, includedDays: []).first
-
-            if let entry = entry, entry.mood != .missing && entry.mood != .placeholder {
-                streak += 1
-                checkDate = Calendar.current.date(byAdding: .day, value: -1, to: checkDate)!
-            } else {
-                break
-            }
-        }
-
-        return streak
+        let votingDate = ShowBasedOnVoteLogics.getCurrentVotingDate(onboardingData: UserDefaultsStore.getOnboarding())
+        return DataController.shared.calculateStreak(from: votingDate).streak
     }
 }