Usage dashboard

// Copyright (c) 2026 Bruno Delorence. MIT License.'use client';/* * Usage dashboard: the Agents screen of a team's coding-agent app, where every agent is signed in * to a plan with a 5-hour (and sometimes a weekly) usage window. An app window with a sidebar * (workspace switcher, search, sections, pinned and shared items, chats with their tickets and pull * requests, the signed-in person), and a main column: a heatmap of the fullest plan window of * every agent over the last day, week or month, and a table of agents with their windows as bars * and their last readings as a line. A row opens the agent's details in a side panel. * * - The heatmap is a grid: hovering or focusing a cell shows its tooltip (agent, span, reading), *   the arrow keys walk it and Enter opens that agent. Its cells stretch to the card; when they *   would get narrower than 12.5 px they merge into fewer columns (the fullest wins), so a narrow card keeps *   readable squares. Hovering a legend swatch lights only the cells of that band. * - 24h / 7d / 30d switch the readings (49 cells: half hours, 3½ hours or 15 hours), the axis and *   the table's line. Agents ⌄ sorts both lists, the toolbar's field filters them. * - A row opens the details panel: plan windows, runtime details and resource charts with their *   own 1h / 6h / 24h, and a menu to restart, copy the ID of or remove the agent (with undo). *   Add agent opens a dialog; the new agent waits for its sign-in, with no readings yet. * - The sidebar folds away (and slides back) from the window bar; on a phone it is a drawer. * - While on screen and untouched, a demo pointer hovers cells and the legend, switches the range, *   opens an agent and its resource range, starts adding an agent and folds the sidebar. Any real

/* Usage dashboard (usage-dashboard.tsx): a near-black app window, its sidebar a shade cooler than   the main column, cards a shade darker than the page they sit on, violet for usage and a burnt   orange for an agent at its limit; by day a pale grey sidebar, a white page and the same violet,   a shade deeper.   Colours are the tokens below, light-dark(light, dark) where the two differ: the component takes   the color-scheme it inherits from the page (light unless the page says otherwise), or the one   its colorScheme prop sets (data-color-scheme).   Sizes are those of the app at its own scale: a 267 px sidebar, 28 px rows in it, a 38 px window   bar, 14 px text. Layout comes from the component's own width (container queries) and the main   column's (the table's columns): the details panel beside the main column from 1100 px and over   it below, the sidebar a drawer under 720 px.   Memory. The sidebar folds and the panel, menus, tooltip and dialog come in by transform and   opacity; the heatmap's cells are plain boxes with a colour, so a range switch only repaints. */.root {  --frame-edge: #d9d9de;  --sidebar: #f3f3f5;  --page: #fbfbfc;  --card: #fff;  --card-edge: #e6e6ea;  --line: #ececf0;

// Copyright (c) 2026 Bruno Delorence. MIT License./* * The small charts: a row's last-day line (a sparkline with gaps where nothing was read) and the * details panel's resource charts (a line, two areas and a filled bar under a dashed limit). All * are SVG drawn in a box of their own units and stretched to their slot with a stroke that does * not scale, so they stay crisp at any width. They are decorative: their figures are in the text * beside them. */import styles from './usage-dashboard.module.css';const W = 134;const H = 30;/** The path of `values` (0–1, null for a gap) across a W × H box, `pad` units off top and bottom. */function line(values: (number | null)[], width = W, height = H, pad = 2) {  const step = width / Math.max(1, values.length - 1);  let d = '';  let open = false;  values.forEach((value, index) => {    if (value === null) {      open = false;      return;

// Copyright (c) 2026 Bruno Delorence. MIT License./* * The dashboard's made-up data: a workspace of coding agents, each signed in to a plan with a * 5-hour and sometimes a weekly usage window, and what each window read every half hour. * * A reading is the share of the agent's fullest plan window, 0 to 1 (1 is at the limit), or null * when the agent sent nothing. The last day is written out by hand, one character a cell: '.' no * reading, 'X' at the limit, and 0–9 then a–j for twentieths. The week and the month are worked out * from a seeded random walk per agent, so they are the same on every load. */export type Range = '24h' | '7d' | '30d';export type Runtime = 'ember' | 'knot';export type Host = 'cloud' | 'self';export type Agent = {  id: string;  name: string;  runtime: Runtime;  host: Host;  version: string;  /** Share of the 5-hour window used, 0–100. */  fiveHour: number;

// Copyright (c) 2026 Bruno Delorence. MIT License./* * The dashboard's icons, drawn on a 24-unit grid with round 1.7-unit strokes. They are decorative * (aria-hidden); their size comes from the stylesheet, their colour from currentColor. The two * runtime marks are filled shapes in their own colours. */import type { ReactNode } from 'react';function Icon({ children, className }: { children: ReactNode; className?: string }) {  return (    <svg      className={className}      viewBox="0 0 24 24"      fill="none"      stroke="currentColor"      strokeWidth="1.7"      strokeLinecap="round"      strokeLinejoin="round"      aria-hidden="true"      focusable="false"    >      {children}

// Copyright (c) 2026 Bruno Delorence. MIT License.'use client';import type { CSSProperties, Ref } from 'react';/* * The demo's pointer, and the steps that move it. A demo is a script of awaited steps: wait, or * glide the pointer somewhere. Stopping the demo (the reader takes over, or it scrolls away) ends * the step in progress at once: its promise rejects, which ends the script right there, and the * pointer fades out. * * Each glide is a curved flight played by the Web Animations API, so nothing runs frame by frame. * The points of the flight are handed to whoever wants to move along with it. The arrow and the hand are HTML boxes * that swap by their visibility: a change of style inside an SVG would lay the SVG out again. */export type Point = { x: number; y: number };/** A glide's path and timing, for an animation that plays along with it. */export type Flight = { points: Point[]; timing: KeyframeAnimationOptions };export type Demo = {  /** Resolves after `ms`. */

// Copyright (c) 2026 Bruno Delorence. MIT License.'use client';import { useCallback, useEffect, useRef, useState } from 'react';/* * When a demo may play on its own: while part of it is on screen and the tab is visible, never * under reduced motion, and not while the reader is using it. `take()` hands it to the reader; it * takes back over `idle` ms after their last input. */export function useAutoplay<T extends HTMLElement>(idle = 6000) {  const ref = useRef<T>(null);  const [visible, setVisible] = useState(false);  const [reduced, setReduced] = useState(true);  const [taken, setTaken] = useState(false);  const timer = useRef(0);  useEffect(() => {    const element = ref.current;    if (!element) return;    let onScreen = false;    const update = () => setVisible(onScreen && !document.hidden);    const observer = new IntersectionObserver(