refactor(web): use @bytelyst/ui CardButton primitive (UI audit #9)

Now that @bytelyst/ui@0.1.6 ships <CardButton>, replace the local
`.card-button` className shim (added to layout-fixes.css §25 in the
prior commit) with the real primitive.

Conversions:
  - components/StrategyWizard.tsx — risk style (3 cards) + hours pickers
  - views/SimpleView.tsx — new-buy + manage-holding plan cards
  - tabs/MyStrategiesTab.tsx — diagnostic accordion toggle

Removes layout-fixes.css §25 (.card-button) — no longer needed.
Updates docs/ui/UI_AUDIT.md Pattern A to reflect that the design-system
fix has shipped.

Generated with [Devin](https://cli.devin.ai/docs)

Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

docs/ui/UI_AUDIT.md

@@ -76,7 +76,7 @@ So a Button intended as a "card-style action" (e.g. a title above a prompt) will
 grep -rEn '<Button[^>]*>.*\n[^<]*<' --include='*.tsx' web/src
 ```
 
-**Recommendation for design system:** add a documented `<CardButton>` primitive that drops `whitespace-nowrap` and removes fixed height, OR add an `as="card"` variant to `<Button>`. This is upstream work in `learning_ai_common_plat`.
+**Recommendation for design system:** ✅ shipped in `@bytelyst/ui@0.1.6` as `<CardButton>`. Drops `whitespace-nowrap`, removes fixed height, preserves the focus-visible ring. Use it whenever a `<Button>` would otherwise wrap a `<div>` or stacked `<span>`s. The 5 Pattern A sites in this repo were converted in commit `c10de34`+ (StrategyWizard ×2, SimpleView ×2, MyStrategiesTab ×1).
 
 ### Pattern B — Inline styles instead of classes
 

web/src/components/StrategyWizard.tsx

@@ -24,6 +24,7 @@ import { createTradeProfile, updateTradeProfile } from '../lib/profileApi';
 import { Button } from './ui/button';
 import { Card } from './ui/card';
 import { Input } from './ui/input';
+import { CardButton } from '@bytelyst/ui';
 
 interface WizardState {
     step: number;
@@ -185,11 +186,10 @@ export const StrategyWizard: React.FC<{
                             const isLocked = !isFeatureAllowed(tier, 'risk_style', style.id);
                             return (
                                 <div key={style.id} className="relative">
-                                    <button
+                                    <CardButton
-                                        type="button"
                                         disabled={isLocked}
                                         onClick={() => setState({ ...state, riskStyle: style })}
-                                        className={`card-button ${optionBaseClass} ${isLocked ? 'cursor-not-allowed opacity-40 grayscale' : 'hover:scale-[1.01] active:scale-[0.99]'
+                                        className={`${optionBaseClass} ${isLocked ? 'cursor-not-allowed opacity-40 grayscale' : 'hover:scale-[1.01] active:scale-[0.99]'
                                             } ${state.riskStyle?.id === style.id
                                                 ? optionSelectedClass
                                                 : optionIdleClass
@@ -212,7 +212,7 @@ export const StrategyWizard: React.FC<{
                                                 <p className="text-sm leading-relaxed text-[var(--muted-foreground)]">{style.description}</p>
                                             </div>
                                         </div>
-                                    </button>
+                                    </CardButton>
                                     {isLocked && (
                                         <div className="absolute top-4 right-4 text-[9px] font-black uppercase text-amber-500/80 tracking-tighter bg-amber-500/10 px-2 py-0.5 rounded border border-amber-500/20">
                                             Pro/Elite Only
@@ -338,11 +338,10 @@ export const StrategyWizard: React.FC<{
 
                     <div className="grid grid-cols-1 gap-4">
                         {(['24/7', 'London + New York', 'Asia only'] as const).map(option => (
-                            <button
+                            <CardButton
-                                type="button"
                                 key={option}
                                 onClick={() => setState({ ...state, hours: option })}
-                                className={`card-button rounded-2xl border-2 p-6 text-left transition-all ${state.hours === option
+                                className={`rounded-2xl border-2 p-6 text-left transition-all ${state.hours === option
                                     ? optionSelectedClass
                                     : optionIdleClass
                                     }`}
@@ -360,7 +359,7 @@ export const StrategyWizard: React.FC<{
                                         </span>
                                     </div>
                                 </div>
-                            </button>
+                            </CardButton>
                         ))}
                     </div>
 

web/src/layout-fixes.css

@@ -494,35 +494,3 @@
   overflow-wrap: anywhere;
 }
 
-/* ---------------------------------------------------------------------------
-   Section 25 — card-button utility (UI audit Pattern A)
-   Use on a native <button> when you need a button-shaped CARD with stacked
-   block content. The @bytelyst/ui Button primitive has whitespace-nowrap +
-   fixed h-{size} that collapses multi-line content. This class restores the
-   focus ring + reset behavior without those constraints.
---------------------------------------------------------------------------- */
-.card-button {
-  appearance: none;
-  -webkit-appearance: none;
-  background: transparent;
-  border: 0;
-  font: inherit;
-  color: inherit;
-  cursor: pointer;
-  display: block;
-  width: 100%;
-  text-align: left;
-  white-space: normal;
-  height: auto;
-  transition: background-color 150ms ease, border-color 150ms ease, box-shadow 150ms ease;
-}
-.card-button:disabled {
-  cursor: not-allowed;
-  opacity: 0.4;
-}
-.card-button:focus-visible {
-  outline: none;
-  box-shadow: 0 0 0 2px var(--bl-bg-canvas, #0b0f17),
-              0 0 0 4px var(--bl-focus-ring, var(--bl-accent, #5A8CFF));
-  border-radius: inherit;
-}

web/src/tabs/MyStrategiesTab.tsx

@@ -27,6 +27,7 @@ import { BacktestRunnerPanel } from '../backtest/components/BacktestRunnerPanel'
 import { useBacktestFeatureGate } from '../backtest/useBacktestFeatureGate';
 import { deleteTradeProfile, fetchTradeProfiles, setTradeProfileActive } from '../lib/profileApi';
 import { Button, IconButton } from '../components/ui/Primitives';
+import { CardButton } from '@bytelyst/ui';
 
 function getStrategyKindLabel(config: any) {
     if (config?.type === 'visual') return 'Visual Builder';
@@ -150,10 +151,8 @@ const ActiveStrategyCard: React.FC<{
 
             {/* 5. Health Diagnostic (Education Layer) */}
             <div style={{ marginBottom: '32px' }}>
-                <button
+                <CardButton
-                    type="button"
                     onClick={() => onToggleExpand(profile.id)}
-                    className="card-button"
                     style={{
                         width: '100%',
                         padding: '16px',
@@ -190,7 +189,7 @@ const ActiveStrategyCard: React.FC<{
                             <p style={{ fontSize: '11px', color: 'var(--bl-warning)', margin: 0, fontStyle: 'italic', fontWeight: 600 }}>{explanation.recommendation}</p>
                         </div>
                     )}
-                </button>
+                </CardButton>
             </div>
 
             {/* 6. Action */}

web/src/views/SimpleView.tsx

@@ -24,6 +24,7 @@ import {
   type TriggerMode,
 } from './tradePlansState';
 import { useTradePlansNavigationState } from './useTradePlansNavigationState';
+import { CardButton } from '@bytelyst/ui';
 
 type SimpleHolding = {
   symbol: string;
@@ -1006,14 +1007,13 @@ export function SimpleView() {
                 </p>
               </div>
               <div className="grid gap-3 md:grid-cols-2">
-              <button
+              <CardButton
-                type="button"
                 onClick={() => {
                   dispatch({ type: 'clear-feedback' });
                   dispatch({ type: 'set-selected-holding-trade-id', value: null });
                   updateDraft('side', 'buy');
                 }}
-                className={`card-button h-auto justify-start rounded-[1.25rem] border px-5 py-5 text-left transition ${
+                className={`h-auto justify-start rounded-[1.25rem] border px-5 py-5 text-left transition ${
                   draft.side === 'buy'
                     ? 'border-[var(--primary)] bg-[var(--accent-soft)]'
                     : 'border-[var(--border)] bg-[var(--card-elevated)]'
@@ -1023,9 +1023,8 @@ export function SimpleView() {
                   <div className="text-sm font-bold text-[var(--foreground)]">New short-term buy plan</div>
                   <div className="mt-2 text-sm font-normal leading-6 text-[var(--muted-foreground)]">Arm a dip-buy trigger and let the app manage the profit exit after fill.</div>
                 </div>
-                </button>
+                </CardButton>
-                <button
+                <CardButton
-                type="button"
                 onClick={() => {
                   dispatch({ type: 'clear-feedback' });
                   if (availableSellHoldings.length > 0) {
@@ -1034,7 +1033,7 @@ export function SimpleView() {
                     updateDraft('side', 'sell');
                   }
                 }}
-                className={`card-button h-auto justify-start rounded-[1.25rem] border px-5 py-5 text-left transition ${
+                className={`h-auto justify-start rounded-[1.25rem] border px-5 py-5 text-left transition ${
                   draft.side === 'sell'
                     ? 'border-[var(--primary)] bg-[var(--accent-soft)]'
                     : 'border-[var(--border)] bg-[var(--card-elevated)]'
@@ -1044,7 +1043,7 @@ export function SimpleView() {
                   <div className="text-sm font-bold text-[var(--foreground)]">Manage an existing holding</div>
                   <div className="mt-2 text-sm font-normal leading-6 text-[var(--muted-foreground)]">Choose a filled holding and place it back under managed profit-taking.</div>
                 </div>
-                </button>
+                </CardButton>
               </div>
             </section>