feat(mobile): add FilterChips primitive (horizontal chip row with Add-filter trigger)

src/components/shared/filter-chips.tsx

@@ -0,0 +1,67 @@
+'use client';
+
+import { X, Filter } from 'lucide-react';
+
+import { cn } from '@/lib/utils';
+
+export type ActiveFilter = {
+  id: string;
+  label: string;
+  /** Compact value rendered on the chip after the label (e.g. ": Active"). */
+  value?: string;
+};
+
+/**
+ * Horizontal chip row for active filters, with an "Add filter" trigger that
+ * the caller wires to a `<Drawer>`. Active chips are dismissable via the X
+ * button. Scrolls horizontally on mobile when there are many filters.
+ */
+export function FilterChips({
+  active,
+  onRemove,
+  onAddClick,
+  className,
+}: {
+  active: ActiveFilter[];
+  onRemove: (id: string) => void;
+  onAddClick: () => void;
+  className?: string;
+}) {
+  return (
+    <div
+      className={cn(
+        'flex items-center gap-2 overflow-x-auto -mx-3 px-3 sm:mx-0 sm:px-0 sm:flex-wrap sm:overflow-visible',
+        className,
+      )}
+    >
+      <button
+        type="button"
+        onClick={onAddClick}
+        className="shrink-0 inline-flex items-center gap-1.5 rounded-full border border-input bg-background px-3 h-9 text-sm font-medium text-foreground hover:bg-accent"
+      >
+        <Filter className="size-4" aria-hidden />
+        Add filter
+      </button>
+
+      {active.map((filter) => (
+        <span
+          key={filter.id}
+          className="shrink-0 inline-flex items-center gap-1 rounded-full bg-secondary text-secondary-foreground px-3 h-9 text-sm font-medium"
+        >
+          <span>
+            {filter.label}
+            {filter.value ? `: ${filter.value}` : ''}
+          </span>
+          <button
+            type="button"
+            onClick={() => onRemove(filter.id)}
+            aria-label={`Remove ${filter.label} filter`}
+            className="-mr-1 inline-flex size-6 items-center justify-center rounded-full hover:bg-secondary-foreground/10"
+          >
+            <X className="size-3.5" aria-hidden />
+          </button>
+        </span>
+      ))}
+    </div>
+  );
+}