feat: add dashboard dimension filtering and custom event properties

Dashboard filtering: FilterBar pills, AddFilterDropdown with dimension/
operator/value steps, URL-serialized filters, all SWR hooks filter-aware.

Custom event properties: pulse.track() accepts props object, EventProperties
panel with auto-discovered key tabs and value bar charts, clickable goal rows.

Updated changelog with both features under v0.13.0-alpha.

components/dashboard/FilterBar.tsx

@@ -0,0 +1,42 @@
+'use client'
+
+import { type DimensionFilter, filterLabel } from '@/lib/filters'
+
+interface FilterBarProps {
+  filters: DimensionFilter[]
+  onRemove: (index: number) => void
+  onClear: () => void
+}
+
+export default function FilterBar({ filters, onRemove, onClear }: FilterBarProps) {
+  if (filters.length === 0) return null
+
+  return (
+    <div className="flex flex-wrap items-center gap-2 mb-4">
+      <span className="text-xs font-medium text-neutral-500 dark:text-neutral-400 uppercase tracking-wider">
+        Filters
+      </span>
+      {filters.map((f, i) => (
+        <button
+          key={`${f.dimension}-${f.operator}-${f.values.join(',')}`}
+          onClick={() => onRemove(i)}
+          className="inline-flex items-center gap-1.5 px-2.5 py-1 text-xs font-medium rounded-full bg-brand-orange/10 text-brand-orange border border-brand-orange/20 hover:bg-brand-orange/20 transition-colors cursor-pointer group"
+          title={`Remove filter: ${filterLabel(f)}`}
+        >
+          <span>{filterLabel(f)}</span>
+          <svg className="w-3 h-3 opacity-60 group-hover:opacity-100" fill="none" viewBox="0 0 24 24" stroke="currentColor" strokeWidth={2}>
+            <path strokeLinecap="round" strokeLinejoin="round" d="M6 18L18 6M6 6l12 12" />
+          </svg>
+        </button>
+      ))}
+      {filters.length > 1 && (
+        <button
+          onClick={onClear}
+          className="text-xs text-neutral-500 dark:text-neutral-400 hover:text-neutral-700 dark:hover:text-neutral-200 transition-colors cursor-pointer"
+        >
+          Clear all
+        </button>
+      )}
+    </div>
+  )
+}