Normalize molecules: fix StepIndicator timing + spacing, ProviderCardCompact consistency

- StepIndicator: transition 300ms → 150ms (system convention)
- StepIndicator: raw px gap/margin strings → MUI spacing values
- StepIndicator: borderRadius '5px' → var(--fa-border-radius-full)
- StepIndicator: mobile font size 10px → 11px (D020 minimum floor)
- ProviderCardCompact: star icon colour → warning.main (match ProviderCard)
- ProviderCardCompact: meta icon fontSize 16 → 14 (match ProviderCard/VenueCard)

Phase 2.1 retroactive review: molecules normalize

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/components/molecules/ProviderCardCompact/ProviderCardCompact.tsx

@@ -101,7 +101,7 @@ export const ProviderCardCompact = React.forwardRef<HTMLDivElement, ProviderCard
 
           {/* Location */}
           <Box sx={{ display: 'flex', alignItems: 'center', gap: 0.5 }}>
-            <LocationOnOutlinedIcon sx={{ fontSize: 16, color: 'text.secondary' }} aria-hidden />
+            <LocationOnOutlinedIcon sx={{ fontSize: 14, color: 'text.secondary' }} aria-hidden />
             <Typography variant="body2" color="text.secondary">
               {location}
             </Typography>
@@ -110,10 +110,7 @@ export const ProviderCardCompact = React.forwardRef<HTMLDivElement, ProviderCard
           {/* Rating */}
           {rating != null && (
             <Box sx={{ display: 'flex', alignItems: 'center', gap: 0.5 }}>
-              <StarRoundedIcon
-                sx={{ fontSize: 16, color: 'var(--fa-color-brand-500)' }}
-                aria-hidden
-              />
+              <StarRoundedIcon sx={{ fontSize: 14, color: 'warning.main' }} aria-hidden />
               <Typography variant="caption" color="text.secondary">
                 {rating} Rating
                 {reviewCount != null