feat: add colored active state to status filter pills

FilterPill gains activeColor prop — when active, border/text/background
tint match the status color instead of generic amber. Inactive dots
are muted at 40% opacity for clear active/inactive contrast.

Applied to TopBar status pills and EventFeed severity pills.

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

src/design-system/composites/EventFeed/EventFeed.tsx

@@ -53,6 +53,13 @@ const DEFAULT_ICONS: Record<SeverityFilter, string> = {
   running: '\u2699',  // ⚙
 }
 
+const SEVERITY_COLORS: Record<SeverityFilter, string> = {
+  error: 'var(--error)',
+  warning: 'var(--warning)',
+  success: 'var(--success)',
+  running: 'var(--running)',
+}
+
 const SEVERITY_LABELS: Record<SeverityFilter, string> = {
   error: 'Error',
   warning: 'Warning',
@@ -140,6 +147,9 @@ export function EventFeed({ events, maxItems = 200, className }: EventFeedProps)
                 key={sev}
                 label={SEVERITY_LABELS[sev]}
                 count={count}
+                dot
+                dotColor={SEVERITY_COLORS[sev]}
+                activeColor={SEVERITY_COLORS[sev]}
                 active={activeFilters.has(sev)}
                 onClick={() => toggleFilter(sev)}
               />

src/design-system/layout/TopBar/TopBar.tsx

@@ -18,11 +18,11 @@ interface TopBarProps {
   className?: string
 }
 
-const STATUS_PILLS: { status: ExchangeStatus; label: string }[] = [
-  { status: 'completed', label: 'OK' },
-  { status: 'warning', label: 'Warn' },
-  { status: 'failed', label: 'Error' },
-  { status: 'running', label: 'Running' },
+const STATUS_PILLS: { status: ExchangeStatus; label: string; color: string }[] = [
+  { status: 'completed', label: 'OK', color: 'var(--success)' },
+  { status: 'warning', label: 'Warn', color: 'var(--warning)' },
+  { status: 'failed', label: 'Error', color: 'var(--error)' },
+  { status: 'running', label: 'Running', color: 'var(--running)' },
 ]
 
 export function TopBar({
@@ -58,10 +58,13 @@ export function TopBar({
 
       {/* Status pills */}
       <div className={styles.filters}>
-        {STATUS_PILLS.map(({ status, label }) => (
+        {STATUS_PILLS.map(({ status, label, color }) => (
           <FilterPill
             key={status}
             label={label}
+            dot
+            dotColor={color}
+            activeColor={color}
             active={globalFilters.statusFilters.has(status)}
             onClick={() => globalFilters.toggleStatus(status)}
           />

src/design-system/primitives/FilterPill/FilterPill.module.css

@@ -35,6 +35,14 @@
   flex-shrink: 0;
 }
 
+.dotMuted {
+  opacity: 0.4;
+}
+
+.activeColored {
+  font-weight: 600;
+}
+
 .label {
   line-height: 1;
 }

src/design-system/primitives/FilterPill/FilterPill.tsx

@@ -7,6 +7,7 @@ interface FilterPillProps {
   active?: boolean
   dot?: boolean
   dotColor?: string
+  activeColor?: string
   onClick?: () => void
   className?: string
 }
@@ -18,21 +19,27 @@ export const FilterPill = forwardRef<HTMLButtonElement, FilterPillProps>(
     active = false,
     dot = false,
     dotColor,
+    activeColor,
     onClick,
     className,
   }, ref) => {
     const classes = [
       styles.pill,
       active ? styles.active : '',
+      active && activeColor ? styles.activeColored : '',
       className ?? '',
     ].filter(Boolean).join(' ')
 
+    const activeStyle = active && activeColor
+      ? { borderColor: activeColor, backgroundColor: `color-mix(in srgb, ${activeColor} 12%, transparent)`, color: activeColor } as React.CSSProperties
+      : undefined
+
     return (
-      <button ref={ref} className={classes} onClick={onClick} type="button" data-active={active || undefined}>
+      <button ref={ref} className={classes} style={activeStyle} onClick={onClick} type="button" data-active={active || undefined}>
         {dot && (
           <span
-            className={styles.dot}
-            style={dotColor ? { background: dotColor } : undefined}
+            className={`${styles.dot} ${!active ? styles.dotMuted : ''}`}
+            style={dotColor ? { background: active ? dotColor : undefined } : undefined}
           />
         )}
         <span className={styles.label}>{label}</span>