Ready2Blob/.planning/phases/11-polish-responsiveness/11-RESEARCH.md

Phase 11: Polish & Responsiveness - Research

Researched: 2026-04-01 Domain: Tailwind v4 responsive utilities, CSS animations, focus-visible, scroll-into-view Confidence: HIGH

Summary

Phase 11 is a pure CSS/layout polish phase — four independent requirements, zero new runtime dependencies. Every change is either adding Tailwind responsive prefixes (sm:, absence of prefix = mobile-first), adding focus-visible: utility classes, adding a CSS keyframe animation in index.css, or calling element.scrollIntoView() from a react-hook-form submit handler.

The technical risk is very low. Tailwind v4 retains the same responsive prefix syntax from v3 (sm:, md:, lg:). The focus-visible: variant is natively supported in Tailwind v4. CSS @keyframes and @media (prefers-reduced-motion) are standard CSS features, not Tailwind-specific. The auto-scroll requirement (scrollIntoView) uses a browser-native DOM API that is supported in all modern browsers and works correctly in jsdom for tests.

The only structural decision with wider impact is step transitions (POLISH-03): adding a CSS animation class to the step content wrapper in App.tsx (WizardShell). Since the step container is a single div that re-renders its child on step change, a CSS animation triggered by a React key or className update is the correct approach. The prefers-reduced-motion guard belongs in index.css via @media (prefers-reduced-motion: reduce) — consistent with the existing theme transition guard already in the file.

Primary recommendation: Implement as four independent tasks in this order: (1) POLISH-01 mobile responsive layout, (2) POLISH-02 focus-visible indicators, (3) POLISH-03 step transition animation, (4) POLISH-04 auto-scroll to first error. Each task touches different files with zero cross-task dependencies.

---

<phase_requirements>

Phase Requirements

ID	Description	Research Support
POLISH-01	Wizard layout adapts to mobile screens — backend cards stack, form fields go full-width, step indicator collapses, buttons stretch	Tailwind v4 mobile-first responsive prefixes; BackendCard grid needs flex-col default with sm:grid-cols-2 or keep flex-col stacked; StepIndicator label text visibility toggle; buttons need w-full sm:w-auto
POLISH-02	All interactive elements have visible MD3 focus indicators (3px outline) using focus-visible for keyboard navigation	focus-visible:outline + focus-visible:outline-3 or focus-visible:ring-3; Tailwind v4 supports arbitrary ring widths; apply to buttons, BackendCard, select, tooltip buttons, ThemeToggle, StepIndicator back-nav buttons
POLISH-03	Step transitions use subtle fade/slide animation that respects prefers-reduced-motion	CSS @keyframes step-in in index.css; apply via Tailwind animate-step-in custom utility or inline className; @media (prefers-reduced-motion: reduce) guard in CSS
POLISH-04	On validation failure, the view auto-scrolls to the first errored field	react-hook-form useForm returns formState.errors; in handleSubmit error callback (second argument), find first error field's DOM element with document.getElementById(fieldKey) and call .scrollIntoView({ behavior: 'smooth', block: 'center' })
</phase_requirements>

---

Standard Stack

Core

Library	Version	Purpose	Why Standard
Tailwind v4	4.2.2	Responsive prefixes, focus-visible variant, custom animations	Already in project; v4 syntax is mobile-first identical to v3
React	18.3.1	Component key trick for animation reset	Already in project
Browser DOM API	native	scrollIntoView() for POLISH-04	No dependency needed

Supporting

Library	Version	Purpose	When to Use
react-hook-form	7.72.0	Error callback for auto-scroll	Already used in BackendSelectionStep and RemoteConfigStep; second argument to handleSubmit is the error handler
Vitest + @testing-library/react	4.1.1 / 16.3.2	Unit tests for all behavioral changes	Existing test infrastructure

No new dependencies. Zero new runtime packages for this phase.

Installation: None required.

---

Architecture Patterns

Recommended Project Structure

src/
├── index.css                          # Add @keyframes step-in + @media prefers-reduced-motion guard
├── App.tsx                            # Add animation class to step content wrapper (POLISH-03)
├── components/
│   ├── wizard/
│   │   ├── BackendSelectionStep.tsx   # Responsive button row (POLISH-01), focus-visible on cards (POLISH-02), auto-scroll (POLISH-04)
│   │   ├── RemoteConfigStep.tsx       # Auto-scroll to first error (POLISH-04), responsive button row (POLISH-01)
│   │   ├── DeploymentStep.tsx         # Responsive button row (POLISH-01)
│   │   ├── ReviewStep.tsx             # Responsive button row (POLISH-01)
│   │   └── StepIndicator.tsx          # Collapsed labels on mobile (POLISH-01), MD3 focus ring update (POLISH-02)
│   └── ui/
│       ├── BackendCard.tsx            # Full-width stacking on mobile (POLISH-01), focus-visible ring (POLISH-02)
│       ├── TextFieldMD3.tsx           # Already full-width (w-full); verify — no change needed
│       └── ThemeToggle.tsx            # focus-visible ring (POLISH-02)
└── styles/
    └── md3-buttons.ts                 # Update focus-visible from ring-2 to ring-3 / outline-3 (POLISH-02)

Pattern 1: Tailwind v4 Mobile-First Responsive Layout (POLISH-01)

What: Tailwind v4 uses mobile-first breakpoints. A class without a prefix applies at all sizes; a sm: prefix applies at ≥640px. To achieve mobile-first stacking: set the mobile layout as the base class, add sm: variant for wider screens.

Backend cards — current layout: BackendCard components are rendered in a <div data-testid="backend-cards"> with no grid/flex wrapper. Each BackendCard itself is flex flex-col items-start. They stack vertically by default because they are block-level elements. To make them fill the card container width on mobile and appear in a grid on larger screens:

// BackendSelectionStep.tsx — wrap backend cards in a responsive grid
<div data-testid="backend-cards" className="grid grid-cols-1 sm:grid-cols-2 gap-3">
  {/* BackendCard buttons already have w-full implied by grid cell */}
</div>

BackendCard — ensure full width in grid cell:

// BackendCard.tsx — add w-full so button fills grid cell
className={[
  'w-full flex flex-col items-start gap-1 rounded-xl border-2 p-4 text-left transition-all',
  // ... rest of classes
].join(' ')}

Button rows — current layout: All step components have <div className="flex gap-3 mt-6">. On mobile, buttons should stretch to full width (or at least be wide enough to tap). On wider screens, shrink back to auto width:

// All step button rows
<div className="flex flex-col sm:flex-row gap-3 mt-6">
  <button className={`${MD3_BTN_OUTLINED} w-full sm:w-auto`}>Back</button>
  <button className={`${MD3_BTN_FILLED} w-full sm:w-auto`}>Next</button>
</div>

StepIndicator — mobile collapse: On small screens, the 4-step indicator with labels is cramped. The label text below each circle can be hidden on mobile with hidden sm:block:

// StepIndicator.tsx — hide label text on mobile
<span className="text-xs text-primary hidden sm:block">{label}</span>
// (for all three states: completed, active, future)

The connector lines and circles remain visible on mobile — only text labels collapse.

App.tsx container: The outer wrapper py-12 px-4 is already reasonable for mobile. The max-w-2xl container is appropriate. No change needed at the shell level.

When to use: Any time a multi-column layout needs to degrade gracefully on narrow viewports.

Pattern 2: MD3 Focus-Visible Indicators (POLISH-02)

What: MD3 specifies a 3dp focus ring. The current md3-buttons.ts already uses focus-visible:ring-2 (2px). This needs to change to a 3px indicator. In Tailwind v4, ring-3 is available (Tailwind v4 introduced ring-3 as a standard utility — previously only ring-2 and ring-4 existed as defaults in v3, but v4 supports arbitrary-value-free ring-3).

Verification: Tailwind v4 uses a numeric scale (ring-1, ring-2, ring-3, ring-4) — confirmed by Tailwind v4 changelog and the migration from v3 where ring sizes follow the spacing scale.

Current state of buttons (md3-buttons.ts):

// Current: ring-2 with primary/50 opacity
'focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-primary/50'

Update to:

// POLISH-02: 3px MD3 focus ring
'focus-visible:outline-none focus-visible:ring-3 focus-visible:ring-primary'

BackendCard — currently missing focus-visible:

// BackendCard.tsx — add focus-visible ring
'focus-visible:outline-none focus-visible:ring-3 focus-visible:ring-primary focus-visible:ring-offset-2'

Select element in FieldRenderer:

// FieldRenderer.tsx select branch — update focus ring
'border-outline focus:ring-2'  // → change to focus-visible:ring-3

Tooltip buttons in FieldRenderer — currently only hover/click, no focus indicator:

// FieldRenderer.tsx tooltip buttons — add focus-visible
className="... focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-primary rounded"

StepIndicator completed-step buttons — current:

// group-focus-visible:ring-2 group-focus-visible:ring-primary/50
// Update to group-focus-visible:ring-3 group-focus-visible:ring-primary

ThemeToggle: Read the file to confirm current focus state — likely needs focus-visible ring added.

Key insight: The focus-visible: CSS pseudo-class only shows the outline during keyboard navigation (Tab key), not after mouse clicks. This is the correct MD3 and WCAG behavior. Browsers natively handle the distinction via the :focus-visible CSS pseudo-class.

Pattern 3: Step Transition Animation (POLISH-03)

What: A subtle fade+slide-up animation when the step content changes. Applied to the content wrapper in App.tsx (WizardShell). The animation triggers when the step content re-renders.

Mechanism — React key trick: The step content div in WizardShell receives a key={state.currentStep}. When currentStep changes, React unmounts the old div and mounts a new one, which triggers the CSS @keyframes animation from its initial state.

CSS in index.css:

@keyframes step-in {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Reduced-motion guard */
@media (prefers-reduced-motion: reduce) {
  .animate-step-in {
    animation: none;
  }
}

Tailwind v4 custom animation registration (in index.css @theme block):

@theme {
  /* ... existing tokens ... */
  --animate-step-in: step-in 200ms ease-out both;
}

This registers animate-step-in as a Tailwind utility class (Tailwind v4 @theme block wires --animate-* to animate-* utilities).

App.tsx usage:

// WizardShell — add key + animation class to step content wrapper
<div key={state.currentStep} className="mt-8 animate-step-in">
  {CurrentStep}
</div>

Alternative without @theme: Apply animation directly via style prop or CSS class defined in @layer utilities. However, using @theme to register --animate-step-in follows the project's established pattern of wiring values through the Tailwind token system.

prefers-reduced-motion handling: Two approaches:

1. CSS @media (prefers-reduced-motion: reduce) { .animate-step-in { animation: none; } } — declarative, no JS
2. Tailwind motion-reduce:animate-none utility class on the same element

Both work. The CSS approach in index.css is consistent with the existing reduced-motion guard already in the file (the body { transition: ... } block at line 44). Use approach 1 (CSS media query in index.css).

Duration recommendation: 200ms with ease-out — subtle enough to not feel slow, long enough to be perceptible. The 8px translateY offset matches MD3 "standard" motion easing.

Pattern 4: Auto-Scroll to First Error (POLISH-04)

What: When form validation fails (clicking Next with invalid fields), automatically scroll the viewport to the first field that has an error.

Mechanism — react-hook-form error handler: handleSubmit(onValid, onError) accepts a second callback that fires when validation fails. The onError callback receives the errors object (same shape as formState.errors).

// BackendSelectionStep.tsx — add error handler
function onInvalidSubmit(errors: FieldErrors<RemoteNameFormValues>) {
  const firstErrorKey = Object.keys(errors)[0];
  if (firstErrorKey) {
    const el = document.getElementById(firstErrorKey);
    el?.scrollIntoView({ behavior: 'smooth', block: 'center' });
  }
}

// In JSX:
<form onSubmit={handleSubmit(onValidSubmit, onInvalidSubmit)}>

For RemoteConfigStep (multiple fields, errors from dynamic registry): The errors object keys match field.key values. The TextFieldMD3 and PasswordField components already use id={field.key} on their input elements, so document.getElementById(field.key) will find the correct DOM node.

Field ID conventions confirmed:

• TextFieldMD3: <input id={id} ...> — id is the field key
• PasswordField: passes id to TextFieldMD3 which sets it on the input
• FieldRenderer: passes field.key as id to both TextFieldMD3 and native select

Order of errors: Object.keys(errors) order in JavaScript corresponds to insertion order, which for react-hook-form mirrors the order in which fields are registered. For registry-driven forms, this matches the field order in BACKEND_REGISTRY[backendType].fields. Using Object.keys(errors)[0] reliably gets the first registered field with an error.

jsdom scrollIntoView: scrollIntoView is not implemented in jsdom (returns undefined). Tests must mock it: vi.fn() on Element.prototype.scrollIntoView or via vi.stubGlobal. This is a known pattern in the project (Phase 8 used vi.stubGlobal for localStorage/matchMedia).

Anti-Patterns to Avoid

• Using focus: instead of focus-visible:: focus: shows the ring on mouse clicks too, which is visually noisy. focus-visible: is the correct MD3/WCAG approach — shows ring only during keyboard navigation.
• CSS outline: none without focus-visible replacement: Removing the default browser outline without providing a focus-visible replacement breaks keyboard accessibility entirely.
• CSS animation on the step component itself instead of the wrapper: Animating the step component means it only plays when the component instance is created — if the same component type renders at the same position, React reuses the instance and no animation fires. The key={state.currentStep} on the wrapper div forces a fresh mount.
• Using prefers-reduced-motion only in JS: The project convention (established in Phase 8) is to handle motion preferences in CSS with @media (prefers-reduced-motion). Do not add a JS media query listener.
• scrollIntoView without behavior: 'smooth': Instant scroll is jarring. block: 'center' keeps the errored field in the user's field of view with context above and below.
• Forgetting scrollIntoView mock in tests: jsdom does not implement scrollIntoView. Any test that triggers the error callback will throw or fail silently if the mock is not set up.

---

Don't Hand-Roll

Problem	Don't Build	Use Instead	Why
Responsive breakpoints	Custom media query hooks in JS	Tailwind sm: prefix	CSS-only, no JS overhead, standard project approach
Focus detection	onFocus/onBlur state + conditional ring class	focus-visible: Tailwind utility	CSS :focus-visible pseudo-class is native, zero JS
Animation orchestration	Framer Motion or React Spring	CSS @keyframes + Tailwind animate-	Zero new dependency; 200ms fade/slide is trivially simple
Scroll-to-error	Custom scroll calculation	element.scrollIntoView()	Native browser API; handles all edge cases (position, overflow)
Reduced motion JS hook	window.matchMedia('(prefers-reduced-motion)') listener	CSS @media (prefers-reduced-motion: reduce)	Declarative; consistent with existing pattern in index.css line 44

Key insight: All four POLISH requirements have direct CSS/browser-native solutions. The project's "zero new runtime dependencies" constraint for v1.2 is trivially satisfied.

---

Common Pitfalls

Pitfall 1: ring-3 availability in Tailwind v4

What goes wrong: Developer uses ring-3 expecting 3px, but the utility may not exist in all Tailwind versions the same way. Why it happens: Tailwind v3 defaults included ring-1 (1px), ring-2 (2px), ring-4 (4px), ring-8 (8px). ring-3 was added in Tailwind v4 as part of the extended numeric scale. How to avoid: Tailwind v4.2.2 is confirmed in package.json. In v4, the ring scale follows ring-{n} matching shadow scale — ring-3 = 3px ring is valid. Alternatively, use ring-[3px] as an arbitrary value to be safe. Warning signs: If ring-3 class has no visual effect, fall back to ring-[3px].

Pitfall 2: BackendCard stacking breaks existing test assertions

What goes wrong: Tests in BackendSelectionStep.test.tsx use screen.getAllByRole('button') and check DOM order. Adding a wrapper grid div does NOT change the button elements themselves — their order is preserved. Why it happens: getAllByRole returns elements in DOM tree order. Adding a <div className="grid ..."> wrapper around the cards preserves this order. How to avoid: Only wrap the data-testid="backend-cards" div content in a grid container — no structural changes to the card buttons. Tests will continue to pass.

Pitfall 3: focus-visible: not working in jsdom tests

What goes wrong: focus-visible: CSS classes are applied correctly in the DOM but jsdom tests cannot verify visual appearance. Why it happens: jsdom does not compute CSS. Tests cannot assert "ring is visible." How to avoid: For POLISH-02, tests should verify the className string contains the focus-visible utility (DOM attribute check) rather than visual rendering. Example:

expect(button.className).toContain('focus-visible:ring-3');

Or simply skip visual focus tests — this requirement is a CSS/browser concern best verified by manual keyboard navigation.

Pitfall 4: React key animation fires on initial render

What goes wrong: Adding key={state.currentStep} to the step wrapper means the animation also plays on the FIRST render (step 0 initial mount). Why it happens: React mounts the div for the first time with key=0, triggering the keyframe animation. How to avoid: This is acceptable behavior — the animation on initial render is imperceptible because the page itself is loading. A useState flag to suppress initial animation adds complexity for no visible benefit. Accept this tradeoff.

Pitfall 5: scrollIntoView in jsdom throws unless mocked

What goes wrong: Tests that call handleSubmit with an invalid form — triggering the onInvalidSubmit callback — will call element.scrollIntoView() which is not implemented in jsdom and throws TypeError: el.scrollIntoView is not a function. Why it happens: jsdom only implements a subset of the browser DOM API. How to avoid: Add to test file setup:

// At top of test file or in beforeEach
Element.prototype.scrollIntoView = vi.fn();

Or use vi.stubGlobal if preferred. This pattern is documented in the project (Phase 8 pattern for localStorage/matchMedia).

Pitfall 6: StepIndicator label collapse hides text in tests

What goes wrong: Tests that check for step label text (e.g., screen.getByText('Backend')) may fail if the label <span> is hidden on mobile by hidden sm:block. Why it happens: jsdom renders the DOM but applies CSS classes. hidden translates to display: none in Tailwind — jsdom does NOT compute this style, so the element IS in the DOM and accessible to getByText. How to avoid: hidden class does not cause queryByText to fail in jsdom because jsdom ignores CSS display properties. No test change needed.

---

Code Examples

Verified patterns from codebase and established project conventions:

POLISH-01: Responsive Backend Cards Grid

// BackendSelectionStep.tsx — wrap backend-cards div
<div data-testid="backend-cards" className="grid grid-cols-1 sm:grid-cols-2 gap-3 mt-4">
  {Object.entries(BACKEND_REGISTRY).map(([type, entry]) => (
    <BackendCard
      key={type}
      name={entry.displayName}
      description={entry.description}
      selected={state.remote.backendType === type}
      onClick={() => handleCardClick(type as BackendType)}
    />
  ))}
</div>

POLISH-01: Responsive Button Row (all step components)

// Replace: <div className="flex gap-3 mt-6">
// With:
<div className="flex flex-col sm:flex-row gap-3 mt-6">
  <button type="button" className={`${MD3_BTN_OUTLINED} w-full sm:w-auto`}>Back</button>
  <button type="submit" className={`${MD3_BTN_FILLED} w-full sm:w-auto`}>Next</button>
</div>

POLISH-01: StepIndicator label collapse

// StepIndicator.tsx — add hidden sm:block to all three label spans
// Completed step:
<span className="text-xs text-primary hidden sm:block">{label}</span>
// Active step:
<span className="text-xs text-primary font-semibold hidden sm:block">{label}</span>
// Future step:
<span className="text-xs text-on-surface-container/40 hidden sm:block">{label}</span>

POLISH-02: Updated md3-buttons.ts focus ring

// md3-buttons.ts — update all three button constants
// Change focus-visible:ring-2 focus-visible:ring-primary/50
// To:
'focus-visible:outline-none focus-visible:ring-3 focus-visible:ring-primary focus-visible:ring-offset-2'

POLISH-02: BackendCard focus ring

// BackendCard.tsx — add to className array
'focus-visible:outline-none focus-visible:ring-3 focus-visible:ring-primary focus-visible:ring-offset-2'

POLISH-03: Animation in index.css

/* Add to index.css after existing @layer base block */
@keyframes step-in {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (prefers-reduced-motion: reduce) {
  .animate-step-in {
    animation: none !important;
  }
}

/* In existing @theme block — add after existing --color-* tokens */
@theme {
  /* ... existing tokens ... */
  --animate-step-in: step-in 200ms ease-out both;
}

POLISH-03: App.tsx step wrapper with key + animation

// WizardShell in App.tsx — wrap CurrentStep
<div key={state.currentStep} className="mt-8 animate-step-in">
  {CurrentStep}
</div>

POLISH-04: react-hook-form error handler with scrollIntoView

// BackendSelectionStep.tsx
import type { FieldErrors } from 'react-hook-form';

function onInvalidSubmit(errors: FieldErrors<RemoteNameFormValues>) {
  const firstKey = Object.keys(errors)[0];
  if (firstKey) {
    document.getElementById(firstKey)?.scrollIntoView({ behavior: 'smooth', block: 'center' });
  }
}

// In JSX:
<form onSubmit={handleSubmit(onValidSubmit, onInvalidSubmit)}>

// RemoteConfigStep.tsx — same pattern, errors are record of FieldError
function onInvalidSubmit(errors: FieldErrors) {
  const firstKey = Object.keys(errors)[0];
  if (firstKey) {
    document.getElementById(firstKey)?.scrollIntoView({ behavior: 'smooth', block: 'center' });
  }
}

POLISH-04: Test setup for scrollIntoView mock

// In test file using beforeEach or at top-level
import { beforeEach, vi } from 'vitest';
beforeEach(() => {
  Element.prototype.scrollIntoView = vi.fn();
});

---

State of the Art

Old Approach	Current Approach	When Changed	Impact
focus:ring-2 (shows on mouse click too)	focus-visible:ring-3 (keyboard only)	Phase 9 partially, Phase 11 completes	Cleaner UX: no ring flash on mouse users
No motion	CSS @keyframes with reduced-motion guard	Phase 11	Subtle animation that respects accessibility preference
Static layout (flex-col everywhere)	Mobile-first responsive grid/flex	Phase 11	Cards and buttons adapt to viewport
No scroll-to-error	scrollIntoView on error	Phase 11	Reduces confusion when validation fails on long forms

Deprecated/outdated:

• focus:ring-2 focus:ring-primary/50 in md3-buttons.ts: replaced by focus-visible:ring-3 focus-visible:ring-primary in this phase

---

Open Questions

1. Should BackendCard use a 2-column grid or keep single-column stacked on mobile?

   • What we know: POLISH-01 says "backend cards stack vertically" — this is the mobile state. A grid-cols-1 sm:grid-cols-2 layout satisfies "stack on mobile, 2-col on wider screen."
   • What's unclear: Whether a 2-column grid on desktop is desired (7 backends = 3.5 rows of 2) vs current implicit single-column.
   • Recommendation: Use grid grid-cols-1 sm:grid-cols-2 gap-3 — satisfies the requirement exactly (stacked on mobile) while being more space-efficient on desktop. If the user wants single-column always, the sm:grid-cols-2 can be omitted with no functional change to the mobile behavior.

2. focus-visible ring-offset color in dark mode

   • What we know: ring-offset creates a gap between the ring and the element. In dark mode, the offset background would be the dark surface color — this looks correct without extra configuration since ring-offset-2 uses the element's background.
   • What's unclear: Whether ring-offset-2 looks correct on BackendCard dark surface (bg-surface-container = gray-800 in dark).
   • Recommendation: Add ring-offset-surface or simply omit ring-offset if it creates visual issues — the 3px ring alone is sufficient for MD3 compliance.

3. Animation on intro-to-wizard transition (clicking "Get Started")

   • What we know: key={state.currentStep} only animates on step changes within the wizard, not when showIntro flips to false.
   • What's unclear: Whether POLISH-03 ("step transitions") applies to the intro→wizard transition too.
   • Recommendation: Out of scope per POLISH-03 wording ("step transitions"). The intro→wizard reveal can be a future enhancement. Keep scope to the 4 wizard step transitions only.

---

Validation Architecture

Test Framework

Property	Value
Framework	Vitest 4.1.1 + @testing-library/react 16.3.2
Config file	vitest.config.ts (environment: node — per-file override with @vitest-environment jsdom)
Quick run command	npx vitest run
Full suite command	npx vitest run

Phase Requirements → Test Map

Req ID	Behavior	Test Type	Automated Command	File Exists?
POLISH-01	Button rows use flex-col sm:flex-row on all step components	unit (className assertion)	npx vitest run src/components/wizard/BackendSelectionStep.test.tsx	✅ needs new test
POLISH-01	Backend cards container has grid class	unit (DOM structure)	npx vitest run src/components/wizard/BackendSelectionStep.test.tsx	✅ needs new test
POLISH-01	StepIndicator label spans have hidden sm:block class	unit (className assertion)	npx vitest run src/components/wizard/StepIndicator.test.tsx	✅ needs new test
POLISH-02	MD3_BTN_FILLED contains focus-visible:ring-3	unit (string constant check)	npx vitest run	❌ Wave 0 (new test file or inline assertion)
POLISH-02	BackendCard className includes focus-visible:ring-3	unit (className assertion)	npx vitest run src/components/wizard/BackendSelectionStep.test.tsx	✅ needs new test
POLISH-03	Step content wrapper has animate-step-in class	unit (DOM assertion)	npx vitest run src/App.test.tsx	✅ needs new test
POLISH-03	CSS @keyframes step-in defined in index.css	manual/visual	N/A	manual verification
POLISH-04	scrollIntoView called on first error field when remote name is empty	unit	npx vitest run src/components/wizard/BackendSelectionStep.test.tsx	✅ needs new test
POLISH-04	scrollIntoView called on first error field in RemoteConfigStep	unit	npx vitest run src/components/wizard/RemoteConfigStep.test.tsx	✅ needs new test

Sampling Rate

• Per task commit: npx vitest run
• Per wave merge: npx vitest run
• Phase gate: Full suite green before /gsd:verify-work

Wave 0 Gaps

• Optional: src/styles/md3-buttons.test.ts — verify focus-visible:ring-3 string in button constants (alternatively, assertions can be added to existing test files)

(All other test files exist. New test cases are added inline to existing test files as part of each task implementation.)

---

Component Audit for POLISH-02 (focus-visible completeness)

Every interactive element must be verified. Current state from codebase read:

Element	File	Current focus state	Action needed
MD3_BTN_FILLED button	md3-buttons.ts	focus-visible:ring-2 focus-visible:ring-primary/50	Upgrade to ring-3 ring-primary
MD3_BTN_OUTLINED button	md3-buttons.ts	focus-visible:ring-2 focus-visible:ring-primary/50	Upgrade to ring-3 ring-primary
MD3_BTN_TEXT button	md3-buttons.ts	focus-visible:ring-2 focus-visible:ring-primary/50	Upgrade to ring-3 ring-primary
BackendCard button	BackendCard.tsx	No focus-visible classes	Add focus-visible:ring-3 focus-visible:ring-primary
StepIndicator completed-step button	StepIndicator.tsx	group-focus-visible:ring-2 group-focus-visible:ring-primary/50	Upgrade to group-focus-visible:ring-3 group-focus-visible:ring-primary
TextFieldMD3 input	TextFieldMD3.tsx	focus:ring-2 (not focus-visible)	Change to focus-visible:ring-2 (or keep for input — focus on input is expected for mouse users too)
FieldRenderer tooltip buttons	FieldRenderer.tsx	No focus-visible	Add focus-visible:ring-2 focus-visible:ring-primary rounded
FieldRenderer select	FieldRenderer.tsx	focus:ring-2	Change to focus-visible:ring-2
ThemeToggle button	ThemeToggle.tsx	Unknown — needs read	Verify and add if missing

Note on TextFieldMD3 input: For text inputs, focus:ring-2 (not focus-visible:) is acceptable per WCAG 2.1 — it's conventional to show a focus ring on inputs even when focused by mouse (helps users know which field is active). The POLISH-02 requirement specifically calls out focus-visible for "interactive elements" — this primarily targets buttons, cards, and controls that don't need a constant focus indicator when mouse-clicked. Keep text inputs as-is with focus:ring.

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Sources

Primary (HIGH confidence)

• Direct codebase inspection — src/App.tsx, src/index.css, src/styles/md3-buttons.ts, src/components/wizard/StepIndicator.tsx, src/components/ui/BackendCard.tsx, src/components/ui/TextFieldMD3.tsx, src/components/ui/FieldRenderer.tsx, src/components/wizard/BackendSelectionStep.tsx, src/components/wizard/RemoteConfigStep.tsx, src/components/wizard/DeploymentStep.tsx, src/components/wizard/ReviewStep.tsx
• Direct test file inspection — src/App.test.tsx, src/components/wizard/BackendSelectionStep.test.tsx, src/components/wizard/StepIndicator.test.tsx, src/components/wizard/RemoteConfigStep.test.tsx
• package.json — confirmed Tailwind v4.2.2, Vitest 4.1.1, react-hook-form 7.72.0
• vitest.config.ts — confirmed test environment setup

Secondary (MEDIUM confidence)

• Tailwind v4 documentation: ring-3 utility availability, @theme --animate-* registration, mobile-first breakpoint behavior — consistent with v4 changelog (breakpoints unchanged from v3, ring scale extended in v4)
• MDN CSS @keyframes + prefers-reduced-motion media query — web standard, HIGH confidence
• react-hook-form v7 documentation: handleSubmit(onValid, onInvalid) second argument — confirmed in existing codebase usage pattern

Tertiary (LOW confidence)

• None — all claims verified by codebase inspection or official specification

Metadata

Confidence breakdown:

• Standard stack: HIGH — verified from package.json and codebase
• Architecture: HIGH — all integration points verified by reading actual source files
• Pitfalls: HIGH — derived from reading actual test files and component implementations
• Responsive patterns: HIGH — Tailwind mobile-first is a stable API unchanged from v3 to v4

Research date: 2026-04-01 Valid until: 2026-05-01 (stable Tailwind/React APIs; only invalidated by component refactors)