📦️(frontend) vendor GridLayout to use react-hook useSize

Replace livekit's modern-only useSize hook with react-hook implementation
that includes polyfill support for older browsers. Will update remaining
layout components in subsequent commits.

Also, it now enables us to fix the pagination controls.

src/frontend/src/features/rooms/livekit/components/controls/PaginationControl.tsx

@@ -0,0 +1,55 @@
+import * as React from 'react'
+import { createInteractingObservable } from '@livekit/components-core'
+import { usePagination } from '@livekit/components-react'
+import { RiArrowLeftSLine, RiArrowRightSLine } from '@remixicon/react'
+
+export interface PaginationControlProps
+  extends Pick<
+    ReturnType<typeof usePagination>,
+    'totalPageCount' | 'nextPage' | 'prevPage' | 'currentPage'
+  > {
+  /** Reference to an HTML element that holds the pages, while interacting (`mouseover`)
+   *  with it, the pagination controls will appear for a while. */
+  pagesContainer?: React.RefObject<HTMLElement>
+}
+
+export function PaginationControl({
+  totalPageCount,
+  nextPage,
+  prevPage,
+  currentPage,
+  pagesContainer: connectedElement,
+}: PaginationControlProps) {
+  const [interactive, setInteractive] = React.useState(false)
+  React.useEffect(() => {
+    let subscription:
+      | ReturnType<ReturnType<typeof createInteractingObservable>['subscribe']>
+      | undefined
+    if (connectedElement) {
+      subscription = createInteractingObservable(
+        connectedElement.current,
+        2000
+      ).subscribe(setInteractive)
+    }
+    return () => {
+      if (subscription) {
+        subscription.unsubscribe()
+      }
+    }
+  }, [connectedElement])
+
+  return (
+    <div
+      className="lk-pagination-control"
+      data-lk-user-interaction={interactive}
+    >
+      <button className="lk-button" onClick={prevPage}>
+        <RiArrowLeftSLine />
+      </button>
+      <span className="lk-pagination-count">{`${currentPage} of ${totalPageCount}`}</span>
+      <button className="lk-button" onClick={nextPage}>
+        <RiArrowRightSLine />
+      </button>
+    </div>
+  )
+}

src/frontend/src/features/rooms/livekit/components/controls/PaginationIndicator.tsx

@@ -0,0 +1,30 @@
+import * as React from 'react'
+
+export interface PaginationIndicatorProps {
+  totalPageCount: number
+  currentPage: number
+}
+
+export const PaginationIndicator: (
+  props: PaginationIndicatorProps & React.RefAttributes<HTMLDivElement>
+) => React.ReactNode = /* @__PURE__ */ React.forwardRef<
+  HTMLDivElement,
+  PaginationIndicatorProps
+>(function PaginationIndicator(
+  { totalPageCount, currentPage }: PaginationIndicatorProps,
+  ref
+) {
+  const bubbles = new Array(totalPageCount).fill('').map((_, index) => {
+    if (index + 1 === currentPage) {
+      return <span data-lk-active key={index} />
+    } else {
+      return <span key={index} />
+    }
+  })
+
+  return (
+    <div ref={ref} className="lk-pagination-indicator">
+      {bubbles}
+    </div>
+  )
+})

src/frontend/src/features/rooms/livekit/components/layout/GridLayout.tsx

@@ -0,0 +1,71 @@
+import * as React from 'react'
+import type { TrackReferenceOrPlaceholder } from '@livekit/components-core'
+import {
+  TrackLoop,
+  usePagination,
+  UseParticipantsOptions,
+  useSwipe,
+} from '@livekit/components-react'
+import { mergeProps } from '@/utils/mergeProps'
+import { PaginationIndicator } from '../controls/PaginationIndicator'
+import { useGridLayout } from '../../hooks/useGridLayout'
+import { PaginationControl } from '../controls/PaginationControl'
+
+/** @public */
+export interface GridLayoutProps
+  extends React.HTMLAttributes<HTMLDivElement>,
+    Pick<UseParticipantsOptions, 'updateOnlyOn'> {
+  children: React.ReactNode
+  tracks: TrackReferenceOrPlaceholder[]
+}
+
+/**
+ * The `GridLayout` component displays the nested participants in a grid where every participants has the same size.
+ * It also supports pagination if there are more participants than the grid can display.
+ * @remarks
+ * To ensure visual stability when tiles are reordered due to track updates,
+ * the component uses the `useVisualStableUpdate` hook.
+ * @example
+ * ```tsx
+ * <LiveKitRoom>
+ *   <GridLayout tracks={tracks}>
+ *     <ParticipantTile />
+ *   </GridLayout>
+ * <LiveKitRoom>
+ * ```
+ * @public
+ */
+export function GridLayout({ tracks, ...props }: GridLayoutProps) {
+  const gridEl = React.createRef<HTMLDivElement>()
+
+  const elementProps = React.useMemo(
+    () => mergeProps(props, { className: 'lk-grid-layout' }),
+    [props]
+  )
+  const { layout } = useGridLayout(gridEl, tracks.length)
+  const pagination = usePagination(layout.maxTiles, tracks)
+
+  useSwipe(gridEl, {
+    onLeftSwipe: pagination.nextPage,
+    onRightSwipe: pagination.prevPage,
+  })
+
+  return (
+    <div
+      ref={gridEl}
+      data-lk-pagination={pagination.totalPageCount > 1}
+      {...elementProps}
+    >
+      <TrackLoop tracks={pagination.tracks}>{props.children}</TrackLoop>
+      {tracks.length > layout.maxTiles && (
+        <>
+          <PaginationIndicator
+            totalPageCount={pagination.totalPageCount}
+            currentPage={pagination.currentPage}
+          />
+          <PaginationControl pagesContainer={gridEl} {...pagination} />
+        </>
+      )}
+    </div>
+  )
+}

src/frontend/src/features/rooms/livekit/hooks/useGridLayout.ts

@@ -0,0 +1,53 @@
+import { GRID_LAYOUTS, selectGridLayout } from '@livekit/components-core'
+import type {
+  GridLayoutDefinition,
+  GridLayoutInfo,
+} from '@livekit/components-core'
+import * as React from 'react'
+import useSize from '@react-hook/size'
+
+/**
+ * The `useGridLayout` hook tries to select the best layout to fit all tiles.
+ * If the available screen space is not enough, it will reduce the number of maximum visible
+ * tiles and select a layout that still works visually within the given limitations.
+ * As the order of tiles changes over time, the hook tries to keep visual updates to a minimum
+ * while trying to display important tiles such as speaking participants or screen shares.
+ *
+ * @example
+ * ```tsx
+ * const { layout } = useGridLayout(gridElement, trackCount);
+ * ```
+ * @public
+ */
+export function useGridLayout(
+  /** HTML element that contains the grid. */
+  gridElement: React.RefObject<HTMLDivElement>,
+  /** Count of tracks that should get layed out */
+  trackCount: number,
+  options: {
+    gridLayouts?: GridLayoutDefinition[]
+  } = {}
+): { layout: GridLayoutInfo; containerWidth: number; containerHeight: number } {
+  const gridLayouts = options.gridLayouts ?? GRID_LAYOUTS
+  const [width, height] = useSize(gridElement)
+  const layout = selectGridLayout(gridLayouts, trackCount, width, height)
+
+  React.useEffect(() => {
+    if (gridElement.current && layout) {
+      gridElement.current.style.setProperty(
+        '--lk-col-count',
+        layout?.columns.toString()
+      )
+      gridElement.current.style.setProperty(
+        '--lk-row-count',
+        layout?.rows.toString()
+      )
+    }
+  }, [gridElement, layout])
+
+  return {
+    layout,
+    containerWidth: width,
+    containerHeight: height,
+  }
+}