feat: add Identifiable protocol support to Language and Themes enums

- Add Identifiable conformance to Language enum with id property
- Add Identifiable conformance to Themes enum with id property
- This enables better SwiftUI integration for list views and selection

Author: jaywcjlove

Sources/CodeMirror/Language.swift

@@ -5,7 +5,8 @@
 //  Created by wong on 8/13/25.
 //
 
-public enum Language: String, CaseIterable, Hashable {
+public enum Language: String, CaseIterable, Hashable, Identifiable {
+    public var id: String { rawValue }
     case troff1 = "1"
     case troff2 = "2"
     case troff3 = "3"

Sources/CodeMirror/Themes.swift

@@ -5,7 +5,8 @@
 //  Created by wong on 8/13/25.
 //
 
-public enum Themes: String, CaseIterable, Hashable {
+public enum Themes: String, CaseIterable, Hashable, Identifiable {
+    public var id: String { rawValue }
     case abcdef
     case abyss
     case androidstudio