feat: add table cell background color picker

- Extended TableCell and TableHeader to support backgroundColor attribute
- Created TableBackgroundColor component with 21 color options
- Integrated color picker into table cell menu using Mantine UI
- Added support for both regular cells and header cells
- Updated imports to use custom TableHeader from @docmost/editor-ext

apps/client/src/features/editor/components/table/table-background-color.tsx

@@ -0,0 +1,156 @@
+import React, { FC } from "react";
+import { IconCheck, IconPalette } from "@tabler/icons-react";
+import {
+  ActionIcon,
+  ColorSwatch,
+  Popover,
+  Stack,
+  Text,
+  Tooltip,
+  UnstyledButton,
+} from "@mantine/core";
+import { useEditor } from "@tiptap/react";
+import { useTranslation } from "react-i18next";
+
+export interface TableColorItem {
+  name: string;
+  color: string;
+}
+
+interface TableBackgroundColorProps {
+  editor: ReturnType<typeof useEditor>;
+}
+
+const TABLE_COLORS: TableColorItem[] = [
+  // First row - grays
+  { name: "Default", color: "" },
+  { name: "Light blue", color: "#E6E9FF" },
+  { name: "Light cyan", color: "#E0F2FE" },
+  { name: "Light teal", color: "#CCFBF1" },
+  { name: "Light yellow", color: "#FEF3C7" },
+  { name: "Light pink", color: "#FCE7F3" },
+  { name: "Light purple", color: "#EDE9FE" },
+
+  // Second row - light colors
+  { name: "Gray", color: "#F3F4F6" },
+  { name: "Blue", color: "#BFDBFE" },
+  { name: "Cyan", color: "#A5F3FC" },
+  { name: "Teal", color: "#99F6E4" },
+  { name: "Yellow", color: "#FDE68A" },
+  { name: "Pink", color: "#FBCFE8" },
+  { name: "Purple", color: "#DDD6FE" },
+  
+  // Third row - bold colors
+  { name: "Dark gray", color: "#9CA3AF" },
+  { name: "Bold blue", color: "#60A5FA" },
+  { name: "Bold cyan", color: "#22D3EE" },
+  { name: "Bold teal", color: "#2DD4BF" },
+  { name: "Bold orange", color: "#FB923C" },
+  { name: "Bold red", color: "#F87171" },
+  { name: "Bold purple", color: "#A78BFA" },
+];
+
+export const TableBackgroundColor: FC<TableBackgroundColorProps> = ({
+  editor,
+}) => {
+  const { t } = useTranslation();
+  const [opened, setOpened] = React.useState(false);
+
+  const setTableCellBackground = (color: string) => {
+    editor
+      .chain()
+      .focus()
+      .updateAttributes("tableCell", { backgroundColor: color || null })
+      .updateAttributes("tableHeader", { backgroundColor: color || null })
+      .run();
+    setOpened(false);
+  };
+
+  // Get current cell's background color
+  const getCurrentColor = () => {
+    if (editor.isActive("tableCell")) {
+      const attrs = editor.getAttributes("tableCell");
+      return attrs.backgroundColor || "";
+    }
+    if (editor.isActive("tableHeader")) {
+      const attrs = editor.getAttributes("tableHeader");
+      return attrs.backgroundColor || "";
+    }
+    return "";
+  };
+
+  const currentColor = getCurrentColor();
+
+  return (
+    <Popover 
+      width={280} 
+      position="bottom" 
+      opened={opened} 
+      onChange={setOpened}
+      withArrow
+      transitionProps={{ transition: 'pop' }}
+    >
+      <Popover.Target>
+        <Tooltip label={t("Background color")} withArrow>
+          <ActionIcon
+            variant="default"
+            size="lg"
+            aria-label={t("Background color")}
+            onClick={() => setOpened(!opened)}
+          >
+            <IconPalette size={18} />
+          </ActionIcon>
+        </Tooltip>
+      </Popover.Target>
+
+      <Popover.Dropdown>
+        <Stack gap="xs">
+          <Text size="sm" c="dimmed">
+            {t("Background color")}
+          </Text>
+          
+          <div
+            style={{
+              display: "grid",
+              gridTemplateColumns: "repeat(7, 1fr)",
+              gap: "8px",
+            }}
+          >
+            {TABLE_COLORS.map((item, index) => (
+              <UnstyledButton
+                key={index}
+                onClick={() => setTableCellBackground(item.color)}
+                style={{
+                  position: "relative",
+                  width: "24px",
+                  height: "24px",
+                }}
+                title={t(item.name)}
+              >
+                <ColorSwatch
+                  color={item.color || "#ffffff"}
+                  size={24}
+                  style={{
+                    border: item.color === "" ? "1px solid #e5e7eb" : undefined,
+                    cursor: "pointer",
+                  }}
+                >
+                  {currentColor === item.color && (
+                    <IconCheck
+                      size={18}
+                      style={{
+                        color: item.color === "" || item.color.startsWith("#F") 
+                          ? "#000000" 
+                          : "#ffffff",
+                      }}
+                    />
+                  )}
+                </ColorSwatch>
+              </UnstyledButton>
+            ))}
+          </div>
+        </Stack>
+      </Popover.Dropdown>
+    </Popover>
+  );
+};

apps/client/src/features/editor/components/table/table-cell-menu.tsx

@@ -15,6 +15,7 @@ import {
   IconTableRow,
 } from "@tabler/icons-react";
 import { useTranslation } from "react-i18next";
+import { TableBackgroundColor } from "./table-background-color";
 
 export const TableCellMenu = React.memo(
   ({ editor, appendTo }: EditorMenuProps): JSX.Element => {
@@ -65,6 +66,8 @@ export const TableCellMenu = React.memo(
         shouldShow={shouldShow}
       >
         <ActionIcon.Group>
+          <TableBackgroundColor editor={editor} />
+          
           <Tooltip position="top" label={t("Merge cells")}>
             <ActionIcon
               onClick={mergeCells}

apps/client/src/features/editor/extensions/extensions.ts

@@ -11,7 +11,6 @@ import { Typography } from "@tiptap/extension-typography";
 import { TextStyle } from "@tiptap/extension-text-style";
 import { Color } from "@tiptap/extension-color";
 import Table from "@tiptap/extension-table";
-import TableHeader from "@tiptap/extension-table-header";
 import SlashCommand from "@/features/editor/extensions/slash-command";
 import { Collaboration } from "@tiptap/extension-collaboration";
 import { CollaborationCursor } from "@tiptap/extension-collaboration-cursor";
@@ -25,6 +24,7 @@ import {
   MathInline,
   TableCell,
   TableRow,
+  TableHeader,
   TrailingNode,
   TiptapImage,
   Callout,

apps/server/src/collaboration/collaboration.util.ts

@@ -11,7 +11,6 @@ import { TextStyle } from '@tiptap/extension-text-style';
 import { Color } from '@tiptap/extension-color';
 import { Youtube } from '@tiptap/extension-youtube';
 import Table from '@tiptap/extension-table';
-import TableHeader from '@tiptap/extension-table-header';
 import {
   Callout,
   Comment,
@@ -22,6 +21,7 @@ import {
   LinkExtension,
   MathBlock,
   MathInline,
+  TableHeader,
   TableCell,
   TableRow,
   TiptapImage,
@@ -31,7 +31,7 @@ import {
   Drawio,
   Excalidraw,
   Embed,
-  Mention
+  Mention,
 } from '@docmost/editor-ext';
 import { generateText, getSchema, JSONContent } from '@tiptap/core';
 import { generateHTML } from '../common/helpers/prosemirror/html';
@@ -46,7 +46,7 @@ export const tiptapExtensions = [
     codeBlock: false,
   }),
   Comment,
-  TextAlign.configure({ types: ["heading", "paragraph"] }),
+  TextAlign.configure({ types: ['heading', 'paragraph'] }),
   TaskList,
   TaskItem,
   Underline,
@@ -64,9 +64,9 @@ export const tiptapExtensions = [
   DetailsContent,
   DetailsSummary,
   Table,
-  TableHeader,
-  TableRow,
   TableCell,
+  TableRow,
+  TableHeader,
   Youtube,
   TiptapImage,
   TiptapVideo,
@@ -76,7 +76,7 @@ export const tiptapExtensions = [
   Drawio,
   Excalidraw,
   Embed,
-  Mention
+  Mention,
 ] as any;
 
 export function jsonToHtml(tiptapJson: any) {

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

@@ -3,4 +3,22 @@ import { TableCell as TiptapTableCell } from "@tiptap/extension-table-cell";
 export const TableCell = TiptapTableCell.extend({
   name: "tableCell",
   content: "paragraph+",
+  
+  addAttributes() {
+    return {
+      ...this.parent?.(),
+      backgroundColor: {
+        default: null,
+        parseHTML: (element) => element.style.backgroundColor || null,
+        renderHTML: (attributes) => {
+          if (!attributes.backgroundColor) {
+            return {};
+          }
+          return {
+            style: `background-color: ${attributes.backgroundColor}`,
+          };
+        },
+      },
+    };
+  },
 });

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

@@ -0,0 +1,24 @@
+import { TableHeader as TiptapTableHeader } from "@tiptap/extension-table-header";
+
+export const TableHeader = TiptapTableHeader.extend({
+  name: "tableHeader",
+  content: "paragraph+",
+  
+  addAttributes() {
+    return {
+      ...this.parent?.(),
+      backgroundColor: {
+        default: null,
+        parseHTML: (element) => element.style.backgroundColor || null,
+        renderHTML: (attributes) => {
+          if (!attributes.backgroundColor) {
+            return {};
+          }
+          return {
+            style: `background-color: ${attributes.backgroundColor}`,
+          };
+        },
+      },
+    };
+  },
+});

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

@@ -1,2 +1,3 @@
 export * from "./row";
 export * from "./cell";
+export * from "./header";