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.blockregistration.ts

@@ -0,0 +1,59 @@
+/**
+ * Block Registration Module
+ * Handles registration of all block handlers with the BlockRegistry
+ * 
+ * Phase 2 Complete: Divider block has been successfully migrated
+ * to the new block handler architecture.
+ * Phase 3 Complete: Paragraph block has been successfully migrated
+ * to the new block handler architecture.
+ * Phase 4 Complete: All heading blocks (h1, h2, h3) have been successfully migrated
+ * to the new block handler architecture using a unified HeadingBlockHandler.
+ * Phase 5 Complete: Quote, Code, and List blocks have been successfully migrated
+ * to the new block handler architecture.
+ * Phase 6 Complete: Image, YouTube, and Attachment blocks have been successfully migrated
+ * to the new block handler architecture.
+ * Phase 7 Complete: Markdown and HTML blocks have been successfully migrated
+ * to the new block handler architecture.
+ */
+
+import { 
+  BlockRegistry, 
+  DividerBlockHandler,
+  ParagraphBlockHandler,
+  HeadingBlockHandler,
+  QuoteBlockHandler,
+  CodeBlockHandler,
+  ListBlockHandler,
+  ImageBlockHandler,
+  YouTubeBlockHandler,
+  AttachmentBlockHandler,
+  MarkdownBlockHandler,
+  HtmlBlockHandler
+} from './blocks/index.js';
+
+// Initialize and register all block handlers
+export function registerAllBlockHandlers(): void {
+  // Register content blocks
+  BlockRegistry.register('divider', new DividerBlockHandler());
+  
+  // Register text blocks
+  BlockRegistry.register('paragraph', new ParagraphBlockHandler());
+  BlockRegistry.register('heading-1', new HeadingBlockHandler('heading-1'));
+  BlockRegistry.register('heading-2', new HeadingBlockHandler('heading-2'));
+  BlockRegistry.register('heading-3', new HeadingBlockHandler('heading-3'));
+  BlockRegistry.register('quote', new QuoteBlockHandler());
+  BlockRegistry.register('code', new CodeBlockHandler());
+  BlockRegistry.register('list', new ListBlockHandler());
+  
+  // Register media blocks
+  BlockRegistry.register('image', new ImageBlockHandler());
+  BlockRegistry.register('youtube', new YouTubeBlockHandler());
+  BlockRegistry.register('attachment', new AttachmentBlockHandler());
+  
+  // Register other content blocks
+  BlockRegistry.register('markdown', new MarkdownBlockHandler());
+  BlockRegistry.register('html', new HtmlBlockHandler());
+}
+
+// Ensure blocks are registered when this module is imported
+registerAllBlockHandlers();