UI foundations: PageHeader, StatTile, validated chart palette, registry primitives

- PageHeader + StatTile standardize the four header and three stat-tile
  variants found in the audit; Inicio and Salarios migrated as proof.
- chart tokens replaced with a teal-anchored categorical scale, CVD-
  ordered and validated (six checks, light + dark surfaces).
- Registry adds: empty, field, item, spinner, progress, toggle-group,
  input-group, popover, kbd (+ toggle dep).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

frontend/src/components/ui/progress.tsx

@@ -0,0 +1,81 @@
+import { Progress as ProgressPrimitive } from "@base-ui/react/progress"
+
+import { cn } from "@/lib/utils"
+
+function Progress({
+  className,
+  children,
+  value,
+  ...props
+}: ProgressPrimitive.Root.Props) {
+  return (
+    <ProgressPrimitive.Root
+      value={value}
+      data-slot="progress"
+      className={cn("flex flex-wrap gap-3", className)}
+      {...props}
+    >
+      {children}
+      <ProgressTrack>
+        <ProgressIndicator />
+      </ProgressTrack>
+    </ProgressPrimitive.Root>
+  )
+}
+
+function ProgressTrack({ className, ...props }: ProgressPrimitive.Track.Props) {
+  return (
+    <ProgressPrimitive.Track
+      className={cn(
+        "relative flex h-1 w-full items-center overflow-x-hidden rounded-full bg-muted",
+        className
+      )}
+      data-slot="progress-track"
+      {...props}
+    />
+  )
+}
+
+function ProgressIndicator({
+  className,
+  ...props
+}: ProgressPrimitive.Indicator.Props) {
+  return (
+    <ProgressPrimitive.Indicator
+      data-slot="progress-indicator"
+      className={cn("h-full bg-primary transition-all", className)}
+      {...props}
+    />
+  )
+}
+
+function ProgressLabel({ className, ...props }: ProgressPrimitive.Label.Props) {
+  return (
+    <ProgressPrimitive.Label
+      className={cn("text-sm font-medium", className)}
+      data-slot="progress-label"
+      {...props}
+    />
+  )
+}
+
+function ProgressValue({ className, ...props }: ProgressPrimitive.Value.Props) {
+  return (
+    <ProgressPrimitive.Value
+      className={cn(
+        "ml-auto text-sm text-muted-foreground tabular-nums",
+        className
+      )}
+      data-slot="progress-value"
+      {...props}
+    />
+  )
+}
+
+export {
+  Progress,
+  ProgressTrack,
+  ProgressIndicator,
+  ProgressLabel,
+  ProgressValue,
+}