Theme: replace remaining 'bold cyan' help category headers

Follow-up to 7587eb4. The earlier sweep regex matched [color] and
[color ...] forms but missed [bold cyan] in HelpCommand category and
statement-help headers. The dark teal Spectre 'cyan' (256-color #51)
bypasses terminal theming and is unreadable on light backgrounds.
Replaced both with Theme.ConnectedPromptColorName ('aqua') so the
headers now follow the terminal palette.

Verified the rest of the codebase by sweeping every named non-ANSI-16
Spectre color (cyan/magenta/violet/orchid/gold1/plum3/deepskyblue1/
seagreen2/lightyellow3/etc.); only doc comments remain.

Author: mkrueger

CosmosDBShell/Azure.Data.Cosmos.Shell.Commands/HelpCommand.cs

@@ -568,7 +568,7 @@ private static void PrintCommandCategory(string categoryName, List<CommandFactor
             return;
         }
 
-        AnsiConsole.MarkupLine(INDENT + $"[bold cyan]{categoryName}[/]");
+        AnsiConsole.MarkupLine(INDENT + $"[bold {Theme.ConnectedPromptColorName}]{categoryName}[/]");
         ShellInterpreter.WriteLine();
 
         var table = new Table()
@@ -628,7 +628,7 @@ private static void PrintSingleStatementHelp((string Name, string Key, string? D
         // Use consistent styling with command help
         if (!string.IsNullOrWhiteSpace(s.Description))
         {
-            AnsiConsole.MarkupLine($"{INDENT}[bold cyan]{Markup.Escape(s.Description)}[/]");
+            AnsiConsole.MarkupLine($"{INDENT}[bold {Theme.ConnectedPromptColorName}]{Markup.Escape(s.Description)}[/]");
         }
 
         ShellInterpreter.WriteLine();