fix: Support hex RGB colors (#RRGGBB) in chat messages (fixes #2054)

Minecraft 1.16+ servers can send custom hex colors in JSON text
components ("color": "#RRGGBB"). MCC's ChatParser.Color2tag() only
recognized the 16 named colors, silently dropping hex values and
leaving gradient/custom-colored chat as uncolored plain text.

- ChatParser: recognize hex color values and emit internal §#rrggbb
  encoding; extend ColorCodeRegex to match the new format
- ClassicConsoleBackend: resolve §#rrggbb to ANSI escape codes via
  ColorHelper before passing to ConsoleInteractive (adapts to the
  configured ConsoleColorMode: 24-bit, 8-bit, 4-bit, or disable)
- McColorParser (TUI): parse §#rrggbb into exact SolidColorBrush
  for full RGB fidelity in Avalonia
- ChatBot.GetVerbatim(): skip the full 8-char §#rrggbb sequence
  instead of only 2 chars, preventing hex digits from leaking into
  stripped text

Made-with: Cursor

MinecraftClient/Scripting/ChatBot.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.IO;
 using System.Linq;
@@ -612,7 +612,7 @@ namespace MinecraftClient.Scripting
         }
 
         /// <summary>
-        /// Remove color codes ("§c") from a text message received from the server
+        /// Remove color codes ("§c" and "§#rrggbb") from a text message received from the server
         /// </summary>
         public static string GetVerbatim(string? text)
         {
@@ -623,10 +623,20 @@ namespace MinecraftClient.Scripting
             var data = new char[text.Length];
 
             for (int i = 0; i < text.Length; i++)
+            {
                 if (text[i] != '§')
+                {
                     data[idx++] = text[i];
+                }
+                else if (i + 1 < text.Length && text[i + 1] == '#' && i + 7 < text.Length)
+                {
+                    i += 7; // skip §#rrggbb (8 chars total, loop increments once)
+                }
                 else
-                    i++;
+                {
+                    i++; // skip §x (2 chars total)
+                }
+            }
 
             return new string(data, 0, idx);
         }