feat: enhance table cells with rich content support (#1409)

- Support multiple content types in table cells and headers: paragraphs, headings, lists (bullet/ordered/task), blockquotes, callouts, images, videos, attachments, math blocks, toggles, and code blocks
- Add custom table extension with smart Tab key handling for list indentation within tables
- Preserve default table navigation when not in lists

packages/editor-ext/src/lib/table/table.ts

@@ -0,0 +1,65 @@
+import Table from "@tiptap/extension-table";
+import { Editor } from "@tiptap/core";
+
+const LIST_TYPES = ["bulletList", "orderedList", "taskList"];
+
+function isInList(editor: Editor): boolean {
+  const { $from } = editor.state.selection;
+  
+  for (let depth = $from.depth; depth > 0; depth--) {
+    const node = $from.node(depth);
+    if (LIST_TYPES.includes(node.type.name)) {
+      return true;
+    }
+  }
+  
+  return false;
+}
+
+function handleListIndent(editor: Editor): boolean {
+  return editor.commands.sinkListItem("listItem") || 
+         editor.commands.sinkListItem("taskItem");
+}
+
+function handleListOutdent(editor: Editor): boolean {
+  return editor.commands.liftListItem("listItem") || 
+         editor.commands.liftListItem("taskItem");
+}
+
+export const CustomTable = Table.extend({
+  addKeyboardShortcuts() {
+    return {
+      ...this.parent?.(),
+      Tab: () => {
+        // If we're in a list within a table, handle list indentation
+        if (isInList(this.editor) && this.editor.isActive("table")) {
+          if (handleListIndent(this.editor)) {
+            return true;
+          }
+        }
+
+        // Otherwise, use default table navigation
+        if (this.editor.commands.goToNextCell()) {
+          return true;
+        }
+
+        if (!this.editor.can().addRowAfter()) {
+          return false;
+        }
+
+        return this.editor.chain().addRowAfter().goToNextCell().run();
+      },
+      "Shift-Tab": () => {
+        // If we're in a list within a table, handle list outdentation
+        if (isInList(this.editor) && this.editor.isActive("table")) {
+          if (handleListOutdent(this.editor)) {
+            return true;
+          }
+        }
+
+        // Otherwise, use default table navigation
+        return this.editor.commands.goToPreviousCell();
+      },
+    };
+  },
+});