feat: Add WYSIWYG editor components and utilities

- Implemented WysiwygModalManager for managing modals related to code blocks and block settings.
- Created WysiwygSelection for handling text selection across Shadow DOM boundaries.
- Introduced WysiwygShortcuts for managing keyboard shortcuts and slash menu items.
- Developed wysiwygStyles for consistent styling of the WYSIWYG editor.
- Defined types for blocks, slash menu items, and shortcut patterns in wysiwyg.types.ts.

ts_web/elements/dees-input-wysiwyg/wysiwyg.constants.ts

@@ -0,0 +1,27 @@
+/**
+ * Shared constants for the WYSIWYG editor
+ */
+
+/**
+ * Available programming languages for code blocks
+ */
+export const PROGRAMMING_LANGUAGES = [
+  'JavaScript',
+  'TypeScript', 
+  'Python',
+  'Java',
+  'C++',
+  'C#',
+  'Go',
+  'Rust',
+  'HTML',
+  'CSS',
+  'SQL',
+  'Shell',
+  'JSON',
+  'YAML',
+  'Markdown',
+  'Plain Text'
+] as const;
+
+export type ProgrammingLanguage = typeof PROGRAMMING_LANGUAGES[number];