Add PocketBase client with contracts and sharp build tooling

Elternbeirat.Web/Features/Events/IcsCalendar.cs

@@ -1,8 +1,9 @@
 using System.Globalization;
 using System.Security.Cryptography;
 using System.Text;
+using Elternbeirat.Web.Services;
 
-namespace Elternbeirat.Web.Services;
+namespace Elternbeirat.Web.Features.Events;
 
 /// <summary>
 /// Builds an iCalendar (RFC 5545) document from the events so visitors can
@@ -82,7 +83,7 @@ public static class IcsCalendar
     {
         var seed = $"{ev.Title}|{ev.Start:O}";
         var hash = SHA256.HashData(Encoding.UTF8.GetBytes(seed));
-        return $"{Convert.ToHexString(hash)[..16].ToLowerInvariant()}@elternbeirat-igmh";
+        return $"{Convert.ToHexString(hash)[..16]}@elternbeirat-igmh";
     }
 
     private static string Local(DateTime value) =>
@@ -93,11 +94,11 @@ public static class IcsCalendar
 
     /// <summary>Escapes the characters that are special in an ICS text value.</summary>
     private static string Escape(string value) => value
-        .Replace("\\", "\\\\")
-        .Replace(";", "\\;")
-        .Replace(",", "\\,")
-        .Replace("\r\n", "\\n")
-        .Replace("\n", "\\n");
+        .Replace("\\", "\\\\", StringComparison.Ordinal)
+        .Replace(";", "\\;", StringComparison.Ordinal)
+        .Replace(",", "\\,", StringComparison.Ordinal)
+        .Replace("\r\n", "\\n", StringComparison.Ordinal)
+        .Replace("\n", "\\n", StringComparison.Ordinal);
 
     // ICS lines are terminated with CRLF regardless of platform.
     private static void AppendLine(StringBuilder sb, string line) =>