feat: enhance profile editing with avatar support and UI adjustments

- Added AvatarPath to ProfileEditResult for user profile updates.
- Updated ProfileEditDialog to include avatar selection with a browse button.
- Increased dialog height to accommodate new avatar input fields.
- Implemented avatar file path handling in the profile edit dialog.

feat: introduce moderation features and user roles

- Added ServerRole enum to define user roles (Member, Mod, Admin, Owner).
- Extended User model to include role, mute, and ban status.
- Created ModerationController for user role assignment, kicking, banning, and muting.
- Implemented methods in IChatBroadcaster and SignalRBroadcaster for user moderation actions.
- Updated database schema with new columns for user roles and moderation states.

fix: ensure muted users cannot send messages

- Added mute status checks in ChatService to prevent message sending for muted users.
- Updated user presence and status handling to reflect role changes and moderation actions.

chore: update constants for ASCII art rendering

- Introduced AsciiArtHeightHalfBlock constant for improved ASCII art rendering.

src/EchoHub.Client/UI/ProfileEditDialog.cs

@@ -9,7 +9,7 @@ namespace EchoHub.Client.UI;
 /// <summary>
 /// Result returned from the profile edit dialog.
 /// </summary>
-public record ProfileEditResult(string? DisplayName, string? Bio, string? NicknameColor);
+public record ProfileEditResult(string? DisplayName, string? Bio, string? NicknameColor, string? AvatarPath);
 
 /// <summary>
 /// A Terminal.Gui dialog for editing the user's profile (display name, bio, nickname color).
@@ -23,7 +23,7 @@ public sealed class ProfileEditDialog
     {
         ProfileEditResult? result = null;
 
-        var dialog = new Dialog { Title = "Edit Profile", Width = 60, Height = 18 };
+        var dialog = new Dialog { Title = "Edit Profile", Width = 60, Height = 22 };
 
         // Display Name
         var nameLabel = new Label
@@ -102,20 +102,66 @@ public sealed class ProfileEditDialog
             UpdateColorPreview(colorPreview, colorField.Text);
         };
 
+        // Avatar
+        var avatarLabel = new Label
+        {
+            Text = "Avatar:",
+            X = 1,
+            Y = 10
+        };
+        var avatarField = new TextField
+        {
+            Text = "",
+            X = 17,
+            Y = 10,
+            Width = Dim.Fill(12)
+        };
+        var browseButton = new Button
+        {
+            Text = "Browse",
+            X = Pos.AnchorEnd(10),
+            Y = 10
+        };
+        var avatarHintLabel = new Label
+        {
+            Text = "(file path or URL)",
+            X = 17,
+            Y = 11
+        };
+        avatarHintLabel.SetScheme(new Scheme
+        {
+            Normal = new Attribute(Color.DarkGray, Color.Blue)
+        });
+
+        browseButton.Accepting += (s, e) =>
+        {
+            e.Handled = true;
+            var openDialog = new OpenDialog
+            {
+                Title = "Select Avatar Image",
+                OpenMode = OpenMode.File,
+            };
+            app.Run(openDialog);
+            if (openDialog.FilePaths.Count > 0)
+            {
+                avatarField.Text = openDialog.FilePaths[0];
+            }
+        };
+
         // Buttons
         var saveButton = new Button
         {
             Text = "Save",
             IsDefault = true,
             X = Pos.Center() - 10,
-            Y = 10
+            Y = 14
         };
 
         var cancelButton = new Button
         {
             Text = "Cancel",
             X = Pos.Center() + 5,
-            Y = 10
+            Y = 14
         };
 
         saveButton.Accepting += (s, e) =>
@@ -123,8 +169,9 @@ public sealed class ProfileEditDialog
             var displayName = NullIfEmpty(nameField.Text?.Trim());
             var bio = NullIfEmpty(bioField.Text?.Trim());
             var nicknameColor = NullIfEmpty(colorField.Text?.Trim());
+            var avatarPath = NullIfEmpty(avatarField.Text?.Trim());
 
-            result = new ProfileEditResult(displayName, bio, nicknameColor);
+            result = new ProfileEditResult(displayName, bio, nicknameColor, avatarPath);
             e.Handled = true;
             app.RequestStop();
         };
@@ -137,7 +184,9 @@ public sealed class ProfileEditDialog
         };
 
         dialog.Add(nameLabel, nameField, bioLabel, bioField, colorLabel, colorField,
-            colorHintLabel, previewLabel, colorPreview, saveButton, cancelButton);
+            colorHintLabel, previewLabel, colorPreview,
+            avatarLabel, avatarField, browseButton, avatarHintLabel,
+            saveButton, cancelButton);
 
         nameField.SetFocus();
         app.Run(dialog);