Some UI changes on settings.

Wino.Core.Domain/CalendarRecurrenceSummaryFormatter.cs

@@ -77,7 +77,7 @@ public static class CalendarRecurrenceSummaryFormatter
 
         return string.Format(
             culture,
-            Translator.GetTranslatedString("CalendarEventCompose_RecurringSummarySmart"),
+            Translator.CalendarEventCompose_RecurringSummarySmart,
             cadenceSummary,
             weekdaySummary,
             timeSummary,

Wino.Core.Domain/Interfaces/IStatePersistenceService.cs

@@ -18,6 +18,11 @@ public interface IStatePersistanceService : INotifyPropertyChanged
     /// </summary>
     string CoreWindowTitle { get; set; }
 
+    /// <summary>
+    /// App mode title shown in the title bar.
+    /// </summary>
+    string AppModeTitle { get; set; }
+
     /// <summary>
     /// When only reader page is visible in small sized window.
     /// </summary>

Wino.Core.Domain/Misc/CalendarColorPalette.cs

@@ -0,0 +1,74 @@
+using System;
+using System.Collections.Generic;
+using System.Globalization;
+
+namespace Wino.Core.Domain.Misc;
+
+public static class CalendarColorPalette
+{
+    private static readonly string[] FlatUiColorPalette =
+    [
+        "#E53935", "#D81B60", "#8E24AA", "#5E35B1", "#3949AB", "#1E88E5", "#039BE5", "#00ACC1", "#00897B", "#43A047",
+        "#7CB342", "#C0CA33", "#FDD835", "#FFB300", "#FB8C00", "#F4511E", "#6D4C41", "#757575", "#546E7A", "#C62828",
+        "#AD1457", "#6A1B9A", "#4527A0", "#283593", "#1565C0", "#0277BD", "#00838F", "#00695C", "#2E7D32", "#558B2F",
+        "#9E9D24", "#F9A825", "#FF8F00", "#EF6C00", "#D84315", "#4E342E", "#616161", "#455A64", "#EF5350", "#EC407A",
+        "#AB47BC", "#7E57C2", "#5C6BC0", "#42A5F5", "#29B6F6", "#26C6DA", "#26A69A", "#66BB6A", "#9CCC65", "#D4E157",
+        "#FFEE58", "#FFCA28", "#FFA726", "#FF7043", "#8D6E63", "#BDBDBD", "#78909C", "#F06292", "#BA68C8", "#9575CD"
+    ];
+
+    public static IReadOnlyList<string> GetColors() => FlatUiColorPalette;
+
+    public static string GetDistinctColor(IEnumerable<string> usedColors)
+    {
+        var used = new HashSet<string>(StringComparer.OrdinalIgnoreCase);
+
+        if (usedColors != null)
+        {
+            foreach (var color in usedColors)
+            {
+                if (TryNormalizeHexColor(color, out var normalized))
+                {
+                    used.Add(normalized);
+                }
+            }
+        }
+
+        foreach (var color in FlatUiColorPalette)
+        {
+            if (!used.Contains(color))
+            {
+                return color;
+            }
+        }
+
+        return FlatUiColorPalette[0];
+    }
+
+    private static bool TryNormalizeHexColor(string value, out string normalized)
+    {
+        normalized = null;
+        if (string.IsNullOrWhiteSpace(value))
+        {
+            return false;
+        }
+
+        var color = value.Trim();
+        if (color.StartsWith('#'))
+        {
+            color = color[1..];
+        }
+
+        if (color.Length != 6)
+        {
+            return false;
+        }
+
+        if (!int.TryParse(color, NumberStyles.HexNumber, CultureInfo.InvariantCulture, out _))
+        {
+            return false;
+        }
+
+        normalized = $"#{color.ToUpperInvariant()}";
+        return true;
+    }
+}

Wino.Core.Domain/Translations/en_US/resources.json

@@ -150,6 +150,7 @@
     "CalendarEventCompose_PickCalendarTitle": "Pick a calendar",
     "CalendarEventCompose_Recurring": "Recurring",
     "CalendarEventCompose_RecurringSummary": "Occurs every {0} {1}{2} {3} effective {4}{5}",
+    "CalendarEventCompose_RecurringSummarySmart": "Occurs {0}{1} {2} effective {3}{4}",
     "CalendarEventCompose_RepeatEvery": "Repeat every",
     "CalendarEventCompose_SelectCalendar": "Select calendar",
     "CalendarEventCompose_SingleOccurrenceSummary": "Occurs on {0} {1}",