How to build a finance dashboard where every number agrees: one seeded book, live prices

export function mulberry32(seed: number) {
  let state = seed >>> 0
  return () => {
    state = (state + 0x6d2b79f5) >>> 0
    let t = state
    t = Math.imul(t ^ (t >>> 15), t | 1)
    t ^= t + Math.imul(t ^ (t >>> 7), t | 61)
    return ((t ^ (t >>> 14)) >>> 0) / 4294967296
  }
}

/** FNV-1a over the parts, so `createRng("ledger", "holdings", 3)` is its own stream. */
export function hashSeed(...parts: (string | number)[]) {
  let hash = 0x811c9dc5
  for (const char of parts.join("|")) {
    hash ^= char.charCodeAt(0)
    hash = Math.imul(hash, 0x01000193)
  }
  return hash >>> 0
}

/**
 * Splits `total` into parts proportional to `weights`, in cents, so the parts add up to `total` exactly (the
 * rounding remainder goes to the largest part).
 */
export function splitMoney(total: number, weights: readonly number[]): number[] {
  const totalCents = toCents(total)
  const weightSum = weights.reduce((sum, weight) => sum + weight, 0) || 1
  const cents = weights.map((weight) => Math.floor((totalCents * weight) / weightSum))
  const remainder = totalCents - cents.reduce((sum, value) => sum + value, 0)
  const largest = weights.indexOf(Math.max(...weights))
  cents[largest] += remainder
  return cents.map(fromCents)
}

// Balancing rows: one consulting payment and one vendor purchase make the month land on its targets.
const [incomeTarget, expenseTarget] = monthTargets(k, ctx, fraction)
const inMonth = drafts.filter((row) => row.date >= month && row.date <= on(31) && row.status !== "failed")
const income = sumBy(inMonth.filter((row) => categoryById(row.categoryId).group === "income"), (row) => row.amount)
const expense = -sumBy(inMonth.filter((row) => categoryById(row.categoryId).group === "expense"), (row) => row.amount)
const client = inputs.clients[rng.int(0, inputs.clients.length - 1)]
// Never let a balancing row turn into its opposite: early in a month the fixed bills alone pass the pro-rated
// target, and older months' targets are only a trend. (On the reference day both rows sit far above the floor.)
const floor = ctx.amount(rng.between(450, 1200))
const incomeGap = Math.max(incomeTarget - income, floor)
const expenseGap = Math.max(expenseTarget - expense, floor)
add({ date: on(Math.min(18, maxDay)), time: "15:45", merchant: client.name, description: "Project milestone", categoryId: "consulting-projects", amount: money(incomeGap), accountId: acc("checking"), method: "Bank transfer", status: "completed" })
add({ date: on(Math.min(19, maxDay)), time: "10:30", merchant: rng.pick(vendors[ctx.entityId]), description: "Wholesale order", categoryId: "vendor-purchases", amount: -money(expenseGap), accountId: acc("checking"), method: "Bank transfer", status: "completed" })

/** Income and expense targets of the month `k` months ago (excluding transfers), scaled to the entity. */
function monthTargets(k: number, ctx: BuildContext, fraction: number): [number, number] {
  const s = ctx.profile.scale
  if (k === 0) return [money(34_600 * s * fraction), money(26_180 * s * fraction)]
  if (k === 1) return [money(30_838 * s), money(28_581 * s)]
  const rng = ctx.rng("targets", k)
  const income = 32_600 * (1 - 0.006 * (k - 2)) * rng.between(0.93, 1.07)
  const expense = 26_300 * (1 - 0.004 * (k - 2)) * rng.between(0.94, 1.06)
  return [money(income * s), money(expense * s)]
}

// The ledger is the one costly collection (≈2,000 rows): built on first read, so views that only need records
// (another entity's approvals in the notification centre) never pay for it.
let ledger: Transaction[] | null = null
return {
  entityId,
  currency: ctx.currency,
  today,
  now,
  institutions: buildInstitutions(ctx),
  accounts,
  cards,
  get transactions() {
    ledger ??= buildLedger(ctx, { accounts, cards, loans, policies, invoices, clients, subscriptions, bills, goals, equities })
    return ledger
  },

/**
 * An account's end-of-day balance for each of the last `days` days, oldest first: today's balance minus everything
 * booked since (the history is derived from the ledger, so it always ends on the balance shown).
 */
export function balanceHistory(data: EntityData, accountId: string, days = 30): { date: ISODay; balance: number }[] {
  const account = data.accounts.find((candidate) => candidate.id === accountId)
  if (!account) return []
  const rows = data.transactions.filter((row) => row.accountId === accountId && counts(row))
  const points: { date: ISODay; balance: number }[] = []
  let balance = account.balance
  for (let offset = 0; offset < days; offset++) {
    const date = addDays(data.today, -offset)
    points.push({ date, balance })
    balance = sumMoney([balance, ...rows.filter((row) => row.date === date).map((row) => -row.amount)])
  }
  return points.reverse()
}

/**
 * Keeps today's balances true to the ledger when a row is booked or taken back (`direction` −1): an account moves by
 * the amount, a credit card's balance owed by its opposite, a debit card's linked account by the amount. Failed rows
 * never moved money. Balance histories are derived backwards from today's balance, so they stay consistent too.
 */
function moveBalances(entityId: EntityId, row: Transaction, direction: 1 | -1) {
  if (row.status === "failed") return
  const data = getEntityData(entityId)
  const delta = row.amount * direction
  const account = data.accounts.find((candidate) => candidate.id === row.accountId)
  if (account) {
    account.balance = cents(account.balance + delta)
    return
  }
  const card = data.cards.find((candidate) => candidate.id === row.accountId)
  if (!card) return
  if (card.type === "credit") {
    card.balance = cents((card.balance ?? 0) - delta)
    return
  }
  const linked = data.accounts.find((candidate) => candidate.id === card.linkedAccountId)
  if (linked) linked.balance = cents(linked.balance + delta)
}

for (const entityId of entityIds) {
  for (const day of [REFERENCE, new Date("2026-11-03T15:00:00Z"), new Date("2027-02-14T15:00:00Z")]) {
    test(`${entityId} on ${day.toISOString().slice(0, 10)}: totals reconcile, lists are sorted, nothing upcoming is past`, () => {
      const data = buildEntityData(entityId, day)

      // deterministic
      expect(JSON.stringify(buildEntityData(entityId, day).transactions)).toBe(JSON.stringify(data.transactions))

      // ledger: sorted oldest → newest, never in the future, every group matches its category
      const keys = data.transactions.map((row) => row.date + row.time)
      expect(keys).toEqual([...keys].sort())
      expect(data.transactions.every((row) => row.date <= data.today)).toBe(true)
      expect(data.transactions.every((row) => row.group === categoryById(row.categoryId).group)).toBe(true)
      // income rows are inflows, expense rows outflows (the balancing rows never flip sign)
      expect(data.transactions.filter((row) => row.group === "income").every((row) => row.amount > 0)).toBe(true)
      expect(data.transactions.filter((row) => row.group === "expense").every((row) => row.amount < 0)).toBe(true)

const fast = process.env.NEXT_PUBLIC_DEMO_FAST === "1"

/** Simulated network latency, 250–600ms. */
export function latency() {
  if (fast) return Promise.resolve()
  return new Promise<void>((resolve) => setTimeout(resolve, 250 + Math.random() * 350))
}

export async function fetchFromBook<T>(entityId: EntityData["entityId"], select: (data: EntityData) => T): Promise<T> {
  await latency()
  return select(getEntityData(entityId))
}

/**
 * A query over the selected entity's book (`?entity=`). The key is ["workspace", entity, domain, ...params], so each
 * entity and filter caches separately and a mutation invalidates them all.
 */
export function useEntityQuery<T>(
  domain: string,
  params: readonly unknown[],
  select: (data: EntityData) => T,
  options: Omit<UseQueryOptions<T>, "queryKey" | "queryFn"> = {},
) {
  const { entityId } = useWorkspace()
  return useQuery<T>({
    queryKey: [queryRoot, entityId, domain, ...params],
    queryFn: () => fetchFromBook(entityId, select),
    // A new period, range or bucket keeps the figures on screen until the new ones arrive (§7.5: charts change without
    // re-drawing from a skeleton). A new entity doesn't: its book is in another currency, so it shows its skeletons.
    placeholderData: (previous, previousQuery) => (previousQuery?.queryKey[1] === entityId ? previous : undefined),
    ...options,
  })
}

export function previousRange(range: DayRange): DayRange {
  const shift = comparisonShift(range)
  if (shift.whole) return { from: addMonths(range.from, -shift.months), to: addDays(range.from, -1) }
  if (shift.months) return { from: addMonths(range.from, -shift.months), to: addMonths(range.to, -shift.months) }
  const length = diffDays(range.to, range.from) + 1
  return { from: addDays(range.from, -length), to: addDays(range.from, -1) }
}

const exportCsv = React.useCallback(() => {
  // Filtered and sorted, before pagination: every matching row, in the order on screen. (Not
  // getSortedRowModel().rows filtered by identity: the sorted model holds shallow copies of the rows.)
  const sorted = table.getPrePaginationRowModel().rows
  downloadCsv(
    csvFileName(title, workspaceDay(today())),
    exportColumns.map((column) => column.columnDef.meta?.label ?? column.id),
    sorted.map((row) => exportColumns.map((column) => cellValue(row, column.id))),
  )
  toast(`Exported ${formatNumber(sorted.length)} ${sorted.length === 1 ? "row" : "rows"}`, { description: `${title} as CSV` })
}, [table, title, exportColumns])

export const TICK_MS = 3000
/** The largest move in one tick, as a share (0.4%). */
export const MAX_STEP = 0.004
/** How far a quote may wander from its opening price, as a share (3%). */
export const BAND = 0.03
/** The chance that a symbol trades in a given tick. */
export const TRADE_CHANCE = 0.6

/** One tick's move for a symbol: 0 when it doesn't trade, else a share in [−MAX_STEP, +MAX_STEP]. Seeded. */
export function walkStep(symbol: string, tick: number): number {
  const next = mulberry32(hashSeed("quote", symbol, tick))
  if (next() >= TRADE_CHANCE) return 0
  return (next() * 2 - 1) * MAX_STEP
}

/** The price after a step: a step that would leave the band is reflected, and the result is clamped to it. */
export function nextPrice(anchor: number, price: number, step: number): number {
  const inBand = (value: number) => Math.abs(value / anchor - 1) <= BAND
  let next = price * (1 + step)
  if (!inBand(next)) next = price * (1 - step)
  if (!inBand(next)) next = Math.min(anchor * (1 + BAND), Math.max(anchor * (1 - BAND), next))
  return next
}

private update() {
  const status: FeedStatus = this.frozen ? "frozen" : this.env.hidden() ? "paused" : "live"
  const run = status === "live" && this.listeners.size > 0
  if (run && !this.stop) this.stop = this.env.every(TICK_MS, () => this.tick())
  if (!run && this.stop) {
    this.stop()
    this.stop = null
  }
  if (status !== this.status) {
    this.status = status
    this.version += 1
    this.emit()
  }
  if (this.listeners.size === 0 && this.ticksSinceIdle > 0) {
    this.ticksSinceIdle = 0
    this.idleListeners.forEach((listener) => listener())
  }
}

/** Quotes for a book's positions; each new price is kept in the data book too (Net worth reads it). */
function useQuoteItems(book: HoldingBook | "fno", rows: { id: string; symbol: string; price: number }[] | undefined, live: boolean) {
  const { entityId } = useWorkspace()
  return React.useMemo<QuoteItem[] | undefined>(
    () => (live ? rows?.map((row) => ({ id: row.id, symbol: row.symbol, price: row.price, onPrice: (price: number) => dataActions.setQuote(entityId, book, row.id, price) })) : undefined),
    [book, rows, live, entityId],
  )
}

/** A book's figures at live prices (`live: false` for books priced once a day: funds at NAV). */
export function useLiveBook<P extends Position, B>(book: HoldingBook, positions: P[] | undefined, derive: (positions: P[]) => B, live = true): B | undefined {
  const items = useQuoteItems(book, positions, live)
  const prices = useLiveQuotes(items)
  return React.useMemo(() => (positions ? derive(repricePositions(positions, prices)) : undefined), [positions, prices, derive])
}

export const formatDefaults = {
  /** Numbers and money: grouping, decimal mark, where the currency symbol goes (Settings → Number format). */
  locale: "en-US",
  /** Dates (Settings → Date format). */
  dateFormat: "medium" as DateOrder,
  currency: "USD",
  /** Settings → General → Timezone default: (UTC−05:00) Eastern Time — New York. Saved, not applied (README). */
  timeZone: "America/New_York",
}

export function FormatPreferencesProvider({ children }: { children: React.ReactNode }) {
  const { general } = useSettings()
  const preferences: FormatPreferences = { locale: general.numberFormat, dateFormat: general.dateFormat }
  const key = `${preferences.locale}|${preferences.dateFormat}`
  applyFormatPreferences(preferences)

  const client = useQueryClient()
  const applied = React.useRef(key)
  React.useEffect(() => {
    if (applied.current === key) return
    applied.current = key
    void client.invalidateQueries({ queryKey: [queryRoot] })
  }, [key, client])

  return <React.Fragment key={key}>{children}</React.Fragment>
}

export default async function RootLayout({ children }: Readonly<{ children: React.ReactNode }>) {
  // The customizer's choices arrive with the request, so the first paint already has the right theme, preset,
  // font, density and privacy state. "system" mode is resolved before paint by next-themes' inline script.
  const jar = await cookies()
  const appearance = parseAppearance(jar.get(APPEARANCE_KEY)?.value)
  const privacy = parsePrivacy(jar.get(PRIVACY_KEY)?.value)

  return (
    <html
      lang="en"
      suppressHydrationWarning
      className={cn(GeistSans.variable, GeistMono.variable, appearance.mode === "dark" && "dark")}
      {...appearanceAttributes(appearance)}
      data-privacy={privacy ? "on" : "off"}
    >

const load = () => import("@/components/charts/cartesian-charts")
if (typeof window !== "undefined") void load()

function placeholder(kind: ChartSilhouette) {
  return function ChartLoading() {
    return <ChartSkeleton kind={kind} height={useChartHeight()} />
  }
}

export const TimeSeriesArea = dynamic(() => load().then((charts) => charts.TimeSeriesArea), { loading: placeholder("line") })
export const MultiLine = dynamic(() => load().then((charts) => charts.MultiLine), { loading: placeholder("line") })
export const GroupedBars = dynamic(() => load().then((charts) => charts.GroupedBars), { loading: placeholder("bars") })

/** Any unknown URL (and notFound() in a page) lands here, inside the shell's inset panel (§12.23). */
export default async function NotFound() {
  const jar = await cookies()
  return (
    <AppShell navCollapsed={parseNavState(jar.get(NAV_STATE_KEY)?.value)}>
      <NotFoundPage />
    </AppShell>
  )
}

/** An id that isn't an invoice number is a 404 — checked outside the loading boundary, so the status is 404 (lesson 7.1). */
export default async function InvoiceLayout({ children, params }: Props) {
  const { id } = await params
  const number = Number(decodeURIComponent(id).replace(/^#/, ""))
  if (!Number.isInteger(number) || number <= 0) notFound()
  return children
}

/* brand (the Meridian preset; other presets override this group only) */
--primary: oklch(0.53 0.2 266); /* #355edd  (white text 5.38:1) */
--primary-foreground: oklch(0.99 0.005 266);
--primary-soft: oklch(0.965 0.022 266); /* #eef4ff */
--primary-soft-foreground: oklch(0.45 0.19 266); /* #2346bc */
--ring: oklch(0.62 0.19 266); /* #507cf7 */
--hero-tint: oklch(0.6 0.2 295); /* violet, the aurora's top-right glow (§6.2) */
/* measured: at the brief's 14% the hero's top-left corner takes muted labels to 4.04–4.33:1 (by preset); 8% keeps
   ≥4.55:1. Dark mode keeps 14%. */
--hero-strength: 8%;
/* measured: the brief's 60% puts big figures' symbol and cents at 4.32–4.43:1 on the hero; 65% gives ≥5.05:1 */
--money-minor-opacity: 0.65;

/** A background, either a token or `top over bottom` (a translucent layer composited on an opaque surface). */
function surface(vars, spec) {
  const [top, bottom] = spec.split(" over ")
  if (!bottom) return color(vars, top)
  const t = color(vars, top)
  const b = surface(vars, bottom)
  return { r: t.r * t.a + b.r * (1 - t.a), g: t.g * t.a + b.g * (1 - t.a), b: t.b * t.a + b.b * (1 - t.a), a: 1 }
}

for (const route of routes) {
  for (const mode of modes) {
    for (const viewport of widths) {
      test(`${route} renders in ${mode} at ${viewport.width}px`, async ({ page, context, baseURL }) => {
        // the kit is the heaviest page by far (13 charts, two tables, the whole ledger on the client)
        if (route === "/dev/kit") test.slow()
        const errors = collectErrors(page)
        await setAppearance(context, baseURL!, { mode })
        await page.emulateMedia({ colorScheme: mode })
        await page.setViewportSize(viewport)

        await page.goto(route, { waitUntil: "networkidle" })
        await expect(page.locator("h1")).toBeVisible()
        const shellRoute = shellRoutes.find((candidate) => candidate.path === route)
        if (shellRoute) {
          // inside the shell: its h1, the breadcrumb ending in the same page, the header and the footer

const results = await new AxeBuilder({ page }).withTags(["wcag2a", "wcag2aa", "wcag21a", "wcag21aa", "wcag22aa", "best-practice"]).analyze()
const blocking = results.violations.filter((violation) => violation.impact === "serious" || violation.impact === "critical")

export const parseAsCalendarDate = createParser<Date>({
  parse: (value) => {
    const match = /^(\d{4})-(\d{2})-(\d{2})$/.exec(value)
    return match ? new Date(Number(match[1]), Number(match[2]) - 1, Number(match[3])) : null
  },
  serialize: (date) =>
    `${date.getFullYear()}-${String(date.getMonth() + 1).padStart(2, "0")}-${String(date.getDate()).padStart(2, "0")}`,
  eq: (a, b) => a.getTime() === b.getTime(),
})

- const filtered = table.getFilteredRowModel().rows
- const rows = table.getSortedRowModel().rows.filter((row) => filtered.includes(row)) // always []
+ const rows = table.getPrePaginationRowModel().rows // filtered and sorted, every page

export function DataTable<TData>(props: DataTableProps<TData>) {
  "use no memo" // the table instance is mutable; keep it uncompiled if the compiler is ever enabled
  // The lint warns even with the directive (react-hooks 7.1): the opt-out is deliberate.
  // eslint-disable-next-line react-hooks/incompatible-library
  const table = useReactTable({ … })

<CheckboxPrimitive.Indicator className="grid place-content-center text-current">
-  <CheckIcon className="size-3.5" />
+  <CheckIcon className="size-3.5 group-data-[state=indeterminate]/checkbox:hidden" />
+  <MinusIcon className="hidden size-3.5 group-data-[state=indeterminate]/checkbox:block" />
</CheckboxPrimitive.Indicator>

@utility live-flash-up {
  position: relative;
  isolation: isolate;
  &::before {
    content: "";
    position: absolute;
    inset: 0;
    z-index: -1;
    border-radius: inherit;
    background-color: var(--positive-soft);
    opacity: 0;
    animation: live-flash 600ms var(--ease-out);
  }
  @media (prefers-reduced-motion: reduce) {
    &::before {
      animation: none;
    }
  }
}

) : (
  // A full-width fill slid left by what is missing, inside a clipping track: the change animates `transform`
  // (compositor only, no layout or paint per frame on live pages) and the fill keeps its rounded end.
  <span className="absolute inset-0 overflow-hidden rounded-full">
    <span
      className={cn("absolute inset-0 rounded-full transition-transform duration-(--dur-slow) ease-out", fill)}
      style={{ transform: `translateX(${width - 100}%)` }}
    />

- for (let tick = 1; tick <= 20_000; tick++) {
-   const next = nextPrice(anchor, price, walkStep(symbol, tick))
-   expect(Math.abs(next / price - 1)).toBeLessThanOrEqual(MAX_STEP + 1e-12)
-   price = next
-   expect(Math.abs(price / anchor - 1)).toBeLessThanOrEqual(BAND + 1e-12)
- }
+ let widestStep = 0, widestDrift = 0
+ for (let tick = 1; tick <= 20_000; tick++) { /* …track the maxima… */ }
+ expect(widestStep).toBeLessThanOrEqual(MAX_STEP + 1e-12)
+ expect(widestDrift).toBeLessThanOrEqual(BAND + 1e-12)

test("links prefetch on intent, not on sight", async ({ page }) => {
  const rsc: string[] = []
  page.on("request", (request) => {
    if (request.headers()["rsc"] === "1" || request.url().includes("_rsc=")) rsc.push(request.url())
  })
  await pageReady(page, "/dashboard/finance")
  await page.waitForTimeout(1500)
  // the 20-odd visible sidebar and card links no longer fetch their routes on load
  expect(rsc.length, rsc.join("\n")).toBeLessThanOrEqual(2)
  const before = rsc.length
  await page.locator('[data-slot="sidebar"] a[href^="/dashboard/cash-flow"]').hover()
  await expect.poll(() => rsc.length).toBeGreaterThan(before)
  await page.locator('[data-slot="sidebar"] a[href^="/dashboard/cash-flow"]').click()
  await expect(page.locator("h1")).toHaveText("Cash flow")
})

// before: import Link from "next/link" — every link in view prefetches its (dynamic) route
export default function IntentLink({ prefetch, onMouseEnter, onFocus, onTouchStart, ...props }: React.ComponentProps<typeof NextLink>) {
  const [intent, setIntent] = React.useState(false)
  return (
    <NextLink
      {...props}
      prefetch={prefetch === false ? false : intent ? (prefetch ?? null) : false}
      onMouseEnter={(event) => { setIntent(true); onMouseEnter?.(event) }}
      onFocus={(event) => { setIntent(true); onFocus?.(event) }}
      onTouchStart={(event) => { setIntent(true); onTouchStart?.(event) }}
    />
  )
}

// before: every even tick drawn centred on its point; the last label hangs past the plot
<XAxis dataKey="label" ticks={evenTicks(data, maxXTicks)} interval={maxXTicks ? 0 : "preserveStartEnd"} />
// after: the same ticks, and Recharts slides the edge labels inside
<XAxis dataKey="label" ticks={evenTicks(data, maxXTicks)} interval="preserveStartEnd" />

// src/app/(app)/settings/[[...tab]]/layout.tsx — outside the route's loading.tsx boundary
export default async function SettingsLayout({ children, params }: { children: React.ReactNode; params: Promise<{ tab?: string[] }> }) {
  const { tab } = await params
  if ((tab && tab.length > 1) || !settingsTabs.some((t) => t.slug === (tab?.[0] ?? "general"))) notFound()
  return children
}
// page.tsx: the same check there came after the 200 (loading.tsx streams first)

const rules = [
  // Only the lengths a CSS hex colour can have (3, 4, 6, 8). Four plain digits are a record number, not a colour:
  // "Invoice #5099" would otherwise read as #RGBA. Every other all-digit form (#000, #333333) still fails.
  { name: "hex colour", pattern: /#(?!\d{4}\b)(?:[0-9a-fA-F]{8}|[0-9a-fA-F]{6}|[0-9a-fA-F]{3,4})\b/g },
  { name: "colour function", pattern: /\b(?:oklch|oklab|lch|lab|rgba?|hsla?|hwb)\(/g },
  {
    name: "Tailwind palette class",
    pattern: new RegExp(`(?<![\\w-])(?:${colorUtilities})-(?:${palette})-\\d{2,3}\\b`, "g"),
  },
  { name: "Tailwind palette class", pattern: new RegExp(`(?<![\\w-])(?:${colorUtilities})-(?:white|black)\\b`, "g") },
]

// src/lib/utils.ts
- export { cn } from "cn"
+ import { createCn } from "cn/config"
+ export const cn = createCn({
+   extend: { classGroups: { "font-size": [{ text: ["display", "h1", "h2", "card-title", "kpi", "body", "body-strong", "small", "caption", "overline"] }] } },
+ })

// tsconfig.json → compilerOptions.paths
"cn": ["./src/lib/utils.ts"]

const NUM = String.raw`(-?[\d.]+(?:e-?\d+)?)`
const LAB = new RegExp(String.raw`^lab\(\s*${NUM}(%?)\s+${NUM}(%?)\s+${NUM}(?:\s*\/\s*${NUM}(%?))?\s*\)$`)
// lab → XYZ (D50) → Bradford to D65 → linear sRGB → WCAG luminance

@import "tailwindcss";
@source not "../../docs";
@source not "../../scripts";

/* globals.css — after @import "shadcn/tailwind.css"; */
- @utility shimmer {            /* merges with shadcn's text shimmer: background-clip: text */
+ @utility skeleton-shimmer {
    background-image: linear-gradient(90deg, transparent, color-mix(in oklch, var(--card) 55%, transparent), transparent);
    background-size: 200% 100%;
    animation: skeleton-shimmer 1.2s var(--ease-in-out) infinite;
  }

- const width = React.useMemo(() => `${Math.floor(Math.random() * 40) + 50}%`, [])
+ const id = React.useId()
+ const width = `${50 + ([...id].reduce((sum, char) => sum + char.charCodeAt(0), 0) % 41)}%`

// components/ui/sidebar.tsx → SidebarGroupLabel
- "… transition-[margin,opacity] duration-200 ease-linear …",
- "group-data-[collapsible=icon]:-mt-8 group-data-[collapsible=icon]:opacity-0",
+ "… transition-[margin,opacity,visibility] duration-200 ease-linear …",
+ "group-data-[collapsible=icon]:-mt-8 group-data-[collapsible=icon]:opacity-0 group-data-[collapsible=icon]:invisible",

function onKeyDown(event: KeyboardEvent) {
- if (event.defaultPrevented || event.isComposing) return
+ if (event.isComposing) return
  if ((event.metaKey || event.ctrlKey) && event.key.toLowerCase() === "k") { event.preventDefault(); togglePalette(); return }
+ if (event.defaultPrevented) return

// components/ui/sidebar.tsx — before (the shadcn registry): a landmark already
function SidebarInset({ className, ...props }: React.ComponentProps<"main">) {
  return <main data-slot="sidebar-inset" … {...props} />
}
// after (marked "Meridian:"): a div; the shell's <main id="main"> inside it is the one main
function SidebarInset({ className, ...props }: React.ComponentProps<"div">) {
  return <div data-slot="sidebar-inset" className={cn("relative flex w-full flex-1 flex-col bg-background", …, className)} {...props} />
}

- <CommandGroup>
+ <CommandGroup forceMount>
    <CommandItem value={`create ${query}`} forceMount onSelect={() => onCreate(query)}>
      Create “{query}”
    </CommandItem>
  </CommandGroup>

- export function QuantityInput({ value, onChange, onBlur, invalid, decimals, unit }: { … }) {
+ export function QuantityInput({ value, onChange, onBlur, invalid, decimals, unit, className, ...props }:
+   Omit<React.ComponentProps<"input">, "value" | "onChange" | "onBlur"> & { … }) {
    return (
      <div className={…}>
-       <input inputMode="decimal" value={raw} … />
+       <input {...props} inputMode="decimal" value={raw} … />

- const primary = active.find((account) => account.primary) ?? active[0]
- const defaults = React.useCallback((): Values => ({ …, accountId: primary?.id ?? "" }), [latest, primary?.id])
- const schema = React.useMemo(() => makeSchema(earliest), [earliest])
+ const primaryId = (active.find((account) => account.primary) ?? active[0])?.id ?? ""
+ const defaults = (): Values => ({ …, accountId: primaryId })
+ const schema = makeSchema(earliest)

// before — still centred on a bottom drawer
<DrawerHeader className="border-b text-left">
// after
<DrawerHeader className="border-b px-5 text-left group-data-[vaul-drawer-direction=bottom]/drawer-content:text-left">

page.on("console", (m) => { if (m.type() === "error") errors.push(m.text()) })
page.on("response", (r) => { if (r.status() >= 400) errors.push(`${r.status()} ${r.url()}`) }) // stays empty
// fix: add src/app/icon.svg

// a phone rail of cards that each hold sr-only text (an InsightCard's "Why?" label, <Money>'s "Amount hidden")
- <div className="-mx-4 flex snap-x snap-mandatory gap-3 overflow-x-auto px-4 scrollbar-none md:grid md:grid-cols-3">
+ <div className="relative -mx-4 flex snap-x snap-mandatory gap-3 overflow-x-auto px-4 scrollbar-none md:grid md:grid-cols-3">

// before
<div className="flex min-w-0 flex-col gap-1.5">{delta}</div>
<div className="shrink-0 h-12 w-40">{chart}</div>
// after
<div className="flex shrink-100 flex-col gap-1.5">{delta}</div>
<div className="min-w-0 h-12 w-40">{chart}</div>

// app-footer.tsx — before
<footer className="mt-auto px-4 lg:px-6">
  <nav aria-label="Legal and support" className="flex items-center gap-4 sm:ml-auto">
// after: the footer is a size container; the links keep the button's room only where the row meets the edge
<footer className="@container mt-auto px-4 lg:px-6">
  <nav aria-label="Legal and support" className="mr-[max(0px,calc(3.75rem-(100cqw-100%)/2))] flex items-center gap-4 sm:ml-auto">