Add connection environment categorization and improve settings dialog UX

[Copilot]

Adds environment categorization (DEV/TEST/PROD) to saved connections and improves settings dialog layout for better usability on smaller screens.

Changes

• Connection Environment Support

  • Added ConnectionEnvironment enum (None, Development, Test, Production) to SavedConnection and StoredConnection models
  • Extended ConnectionStorageService to persist environment metadata
  • Added environment filter tabs to Connection Library dialog
  • Display environment badges on connection cards with abbreviated labels (DEV/TEST/PROD)

• Settings Dialog Layout

  • Moved action buttons outside ScrollViewer and docked to bottom for consistent accessibility
  • Wrapped settings content in ScrollViewer to prevent overflow on smaller screens
  • Cleaned up trailing whitespace

Example Usage

// Connections now include environment metadata
var connection = new SavedConnection(
    Id: guid,
    Name: "Production Bus",
    ConnectionString: connString,
    Type: ConnectionType.Namespace,
    EntityName: null,
    CreatedAt: DateTimeOffset.UtcNow,
    Environment: ConnectionEnvironment.Production  // New
);

// Display helpers available
connection.EnvironmentDisplayName;  // "PROD"
connection.HasEnvironment;          // true

Backward compatible with existing saved connections (default to Environment.None).

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[Copilot]

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