feat(ui): #1977: TableCell (#1979)

* feat(ui): add Skeleton component

* feat(ui): implement responsive typography

* feat(ui): add `bodyTechnical` text style

* chore: changeset

* feat(ui): #1977: add `TableCell` UI component

* chore: changeset

* fix(ui): add `as` param to TableCell

.changeset/sweet-jeans-design.md

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+---
+'@penumbra-zone/ui': minor
+---
+
+Add `TableCell` UI component

packages/ui/src/TableCell/index.stories.tsx

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+import type { Meta, StoryObj } from '@storybook/react';
+
+import { TableCell } from '.';
+import { Pill } from '../Pill';
+
+const meta: Meta<typeof TableCell> = {
+  component: TableCell,
+  tags: ['autodocs', '!dev', 'density'],
+};
+export default meta;
+
+type Story = StoryObj<typeof TableCell>;
+
+export const Basic: Story = {
+  render: function Render() {
+    return (
+      <div className='grid grid-cols-5'>
+        <div className='col-span-5 grid grid-cols-subgrid'>
+          <TableCell heading>Name</TableCell>
+          <TableCell heading>Loading</TableCell>
+          <TableCell heading>Price</TableCell>
+          <TableCell heading>Amount</TableCell>
+          <TableCell heading>Number</TableCell>
+        </div>
+        <div className='col-span-5 grid grid-cols-subgrid'>
+          <TableCell cell>Hello</TableCell>
+          <TableCell cell loading={true}>
+            World
+          </TableCell>
+          <TableCell cell>What</TableCell>
+          <TableCell cell>
+            <Pill>Pending</Pill>
+          </TableCell>
+          <TableCell cell numeric>
+            11.1111
+          </TableCell>
+        </div>
+        <div className='col-span-5 grid grid-cols-subgrid'>
+          <TableCell footer>Hello</TableCell>
+          <TableCell footer loading={true}>
+            World
+          </TableCell>
+          <TableCell footer>What</TableCell>
+          <TableCell footer>
+            <Pill>Pending</Pill>
+          </TableCell>
+          <TableCell footer numeric>
+            88.2222
+          </TableCell>
+        </div>
+      </div>
+    );
+  },
+};

packages/ui/src/TableCell/index.tsx

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+import cn from 'clsx';
+import { ElementType, ReactNode } from 'react';
+import { Density, useDensity } from '../utils/density';
+import { Skeleton } from '../Skeleton';
+import {
+  tableHeading,
+  tableHeadingMedium,
+  tableHeadingSmall,
+  tableItem,
+  tableItemMedium,
+  tableItemSmall,
+} from '../utils/typography';
+
+export type TableCellVariant = 'title' | 'heading' | 'cell' | 'lastCell' | 'footer';
+
+type TableCellType = {
+  [K in TableCellVariant]: Record<K, true> & Partial<Record<Exclude<TableCellVariant, K>, never>>;
+}[TableCellVariant];
+
+type TableCellPropType =
+  | (TableCellType & { variant?: never })
+  | (Partial<Record<TableCellVariant, never>> & {
+      /** dynamic table cell type: `'title' | 'heading' | 'cell' | 'lastCell' | 'footer'` */
+      variant?: TableCellVariant;
+    });
+
+export type TableCellProps = TableCellPropType & {
+  children: ReactNode;
+  as?: ElementType;
+  loading?: boolean;
+  /** Renders numbers in a monospace font with letters of equal size */
+  numeric?: boolean;
+};
+
+const classesByVariant: Record<TableCellVariant, string> = {
+  title: cn('text-text-primary'),
+  heading: cn('text-text-secondary border-b border-b-other-tonalStroke'),
+  cell: cn('text-text-primary border-b border-b-other-tonalStroke'),
+  lastCell: cn('text-text-primary'),
+  footer: cn('text-text-secondary'),
+};
+
+const classesByDensity: Record<Density, string> = {
+  sparse: 'py-1 px-3 h-14',
+  compact: 'py-1 px-3 h-12',
+  slim: 'py-1 px-3 h-8',
+};
+
+const defaultFont: Record<Density, string> = {
+  sparse: tableItem,
+  compact: tableItemMedium,
+  slim: tableItemSmall,
+};
+
+const headingFont: Record<Density, string> = {
+  sparse: tableHeading,
+  compact: tableHeadingMedium,
+  slim: tableHeadingSmall,
+};
+
+/**
+ * **TableCell** is a unified component for tables within Penumbra ecosystem.
+ * It has multiple style variants:
+ *
+ * 1. `heading` – darkened bold text
+ * 2. `cell` – regular info cell
+ * 3. `title` – emphasized cell
+ * 4. `lastCell` – borderless cell
+ * 5. `footer` – borderless darkened cell
+ *
+ * You can pass the variant as a named prop (`<TableCell heading />`) or dynamically as a string (`<TableCell variant='heading' />`).
+ *
+ * Use `numeric` prop to render numbers in a monospace font with letters of equal size.
+ *
+ * Example table with **TableCell**:
+ *
+ * ```tsx
+ * <div className='grid grid-cols-3'>
+ *   <div className='col-span-3 grid grid-cols-subgrid'>
+ *     <TableCell heading>Name</TableCell>
+ *     <TableCell heading>Pill</TableCell>
+ *     <TableCell heading>Amount</TableCell>
+ *   </div>
+ *   <div className='col-span-3 grid grid-cols-subgrid'>
+ *     <TableCell cell loading>Hello</TableCell>
+ *     <TableCell cell>
+ *       <Pill>Pending</Pill>
+ *     </TableCell>
+ *     <TableCell cell numeric>
+ *       11.1111
+ *     </TableCell>
+ *   </div>
+ * </div>
+ * ```
+ */
+export const TableCell = ({
+  children,
+  loading,
+  numeric,
+  as: Container = 'div',
+  ...props
+}: TableCellProps) => {
+  const density = useDensity();
+  const type: TableCellVariant =
+    props.variant ??
+    (props.title && 'title') ??
+    (props.heading && 'heading') ??
+    (props.lastCell && 'lastCell') ??
+    (props.footer && 'footer') ??
+    (props.cell && 'cell') ??
+    'cell';
+
+  return (
+    <Container
+      className={cn(
+        'flex items-center gap-2',
+        classesByVariant[type],
+        classesByDensity[density],
+        type === 'heading' ? headingFont[density] : defaultFont[density],
+        numeric && 'font-mono tabular-nums',
+      )}
+    >
+      {loading ? (
+        <div className='h-1/2 w-full max-w-14'>
+          <Skeleton />
+        </div>
+      ) : (
+        children
+      )}
+    </Container>
+  );
+};
+TableCell.displayName = 'TableCell';