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shankar0123
9ce2d8ca8f
Closes the Phase 4 batch from cowork/frontend-design-audit.html: skeleton
primitive, route-level lazy splitting + vendor manualChunks, mega-page
split (OnboardingWizard), targeted memoization for dashboard charts,
useTransition for filter-toolbar.
═════════════════════════ AUDIT VERIFICATION ═════════════════════════
Confirmed facts from the live repo before implementing (not the audit's
stamped numbers — those drifted):
• Pre-Phase-4 index-*.js = 1,121,868 B raw / 288,238 B gz
(audit said 980 KB / 247 KB — drifted UP since the audit was written)
• React.lazy sites = 1 (CommandPaletteHost from Phase 3); zero route-
level lazy boundaries before this commit
• vite.config.ts had NO rollupOptions.output.manualChunks
• Mega-page LOCs: OnboardingWizard 1043 / CertificateDetailPage 977 /
SCEPAdminPage 806 / CertificatesPage 812 / ESTAdminPage 646
(audit said 1033 / 936 / 806 / 751 / 646 — all grew due to Phase 1-3
additions; still mega)
• Memoization tally: React.memo 0, useMemo 22, useCallback 5,
useTransition 0, useDeferredValue 0
• DashboardPage useQuery sites = 9 (audit said 10 — overcount)
• OnboardingWizard step structure = 4 step fns (issuer / agent /
certificate / complete) + StepIndicator + WizardFooter +
CodeBlock + 2 inline create modals. The audit's "6-way split"
suggestion = 6 files post-split (shell + indicator/shell helpers
+ 4 step files), which is what this commit ships.
═════════════════════════════ CLOSURES ═══════════════════════════════
UX-M1 — Skeleton primitive (web/src/components/Skeleton.tsx, +6 tests)
• Four variants: page / table / card / stat
• Each uses Tailwind animate-pulse on layout-shaped divs so eventual
content lands without CLS
• role="status" + aria-busy="true" + aria-label for SR users
• DataTable.tsx now uses Skeleton variant="table" with columns prop
instead of the centered "Loading..." spinner — every DataTable
consumer gets layout-shape-preserving loading without code changes.
The skeleton sizes the table to the actual column count + adds a
selectable-column slot when relevant.
FE-M5 + SCALE-H1 — route-level code split + vendor manualChunks
• main.tsx: every page route except DashboardPage (landing route, kept
eager) is now React.lazy() + wrapped in <Suspense fallback={
<Skeleton variant="page" />}> via lazyRoute() helper. 35 lazy
routes total.
• OnboardingWizard is also lazy-imported inside DashboardPage —
keeps its 29 KB step-form code off the dashboard hot path for every
operator who already dismissed the first-run wizard.
• vite.config.ts: rollupOptions.output.manualChunks splits
react+react-dom (132 KB), react-router-dom (24 KB),
@tanstack/react-query (28 KB), recharts (383 KB!), and lucide-react
(16 KB) into named vendor chunks. Vite 8 rolldown requires the
function-shape manualChunks (id) => string; not the Vite-5 object
shape — confirmed against the actual build error before writing
the function.
Bundle profile (raw / gz):
pre-Phase-4 single index-*.js = 1,121,868 / 288,238
post-Phase-4 index-*.js = 91,978 / 25,867 (-92% raw)
vendor-react = 132,821 / 43,113
vendor-router = 23,835 / 8,763
vendor-query = 28,029 / 8,693
vendor-icons = 15,663 / 6,149
vendor-recharts = 382,953 / 110,251 (Dashboard-only)
per-route chunks = 1.4-26 KB raw each
Non-Dashboard cold load: vendor-react + vendor-router + vendor-query
+ vendor-icons + index + per-route chunk ≈ 95 KB gz first-load.
Dashboard cold load adds vendor-recharts (110 KB gz) on demand.
Audit target was <100 KB gz first-load for non-Dashboard routes — hit.
FE-M3 + P-M2 (partial) — OnboardingWizard mega-page split
• 1043 LOC monolith → src/pages/OnboardingWizard.tsx (100 LOC shell) +
src/pages/onboarding/{types.ts, StepShell.tsx, IssuerStep.tsx,
AgentStep.tsx, CertificateStep.tsx, CompleteStep.tsx} (6 files,
largest = CertificateStep at 504 LOC for the certificate form +
two inline create-team/create-owner modals it owns).
• Behavior preserved byte-equivalent — DashboardPage's lazy-import
path is unchanged because OnboardingWizard.tsx still exists at the
same location with the same default-export prop shape.
• CertificateDetailPage / SCEPAdminPage / ESTAdminPage / CertificatesPage
splits deferred: each is already in its own lazy chunk (the bundle-
size win is achieved). Splitting them adds maintenance benefit but
requires careful URL-preservation work (especially CertDetail tab
routing — /certificates/:id must redirect to /overview to preserve
deep links). Documented as Phase 4 follow-up; not blocking on this
closure.
PERF-M1 + P-H3 — memoized dashboard chart panels + useTransition filter
• src/pages/dashboard/charts.tsx — 4 React.memo()-wrapped chart panels
(CertsByStatusPieChart, ExpirationTimelineBarChart, JobTrendsLine-
Chart, IssuanceRateBarChart) + ChartCard + CustomTooltip + shared
helpers. Pre-Phase-4 these lived as inline JSX in DashboardPage's
return; any of the 9 useQuery refetches forced all four Recharts
subtrees to reconcile. Post-Phase-4 each panel only re-renders when
its specific data prop's reference changes.
• DashboardPage useMemo wraps pieData + weeklyExpiration so the
memo'd children's prop-equality check works (without useMemo a
fresh array on every render defeats the memo).
• Rules-of-Hooks: useMemo hooks live BEFORE the wizard early-return —
not after. (First implementation put them after; vitest caught it
with "Rendered more hooks than during the previous render" — fixed.)
• useListParams hook now wraps setSearchParams in useTransition so
URL-resident filter / sort / page updates are marked low-priority.
React can preempt the result-table reconciliation when the operator
toggles dropdowns rapidly. Affects every list page that uses the
hook (CertificatesPage is the main consumer post-Bundle-8).
═══════════════════════════ VERIFICATION ═════════════════════════════
• npx tsc --noEmit — exits 0
• Skeleton primitive: 6/6 tests green
• Component suite (12 files): 137/137 green
• Auth-page suite (13 files): 130/130 green
• Dashboard + Onboarding + Certificates + CertificateDetail + Targets
+ Agents + Issuers + Jobs + SCEPAdmin + ESTAdmin: 71/71 green
• npm run build clean; chunk inventory verified (vendor-react,
vendor-router, vendor-query, vendor-recharts, vendor-icons emitted
as named chunks; 35 per-route lazy chunks emitted; index-*.js
shrunk to 91.66 KB raw / 25.92 KB gz).
═══════════════════════════ RESIDUAL RISK ════════════════════════════
• Vite 8 + rolldown's manualChunks signature differs from Vite 5;
upgrading Vite again would re-break this config. Comment in
vite.config.ts pins the function-shape requirement.
• CertificateDetailPage / SCEP / EST / CertificatesPage splits remain
open. Mega-LOC files but already lazy-chunked, so deferring is safe.
• Recharts ResizeObserver mis-fires when memo'd panels resize at the
same time the parent re-renders. The audit flagged this; no
repro observed in vitest but worth monitoring in the demo.