fix(savings): DS conformance pass on stepper, ring, card, status pill

- StatusPill: use functional `text-success` / `text-warning` tokens with
  matching icon colors and `px-2 py-1`, mirroring
  `app/views/budget_categories/_budget_category.html.erb:29-43`.
- ProgressRing: rework center text to match `_budget_donut.html.erb`
  (small "Saved" label, `text-3xl font-medium` headline, "of $X"
  underline). Stroke color now derives from goal.status (yellow when
  behind, blue on track, green reached, gray for no-date).
- GoalCard bar: track height + transition match budget category bar
  (`h-1.5`, `transition-all duration-500`, `inline-size`).
- Index/show layouts: render page header inline (`<h1>` + actions). The
  default application layout doesn't yield `:page_actions`, so the
  CTA + kebab menu wouldn't appear when emitted via `content_for`.
- Stepper review summary: target the actual form inputs by `name`
  rather than relying on the `data-target` Stimulus attribute, since
  `money_field` puts the attribute on the wrapper. Step 1 validation
  scoped to the step 1 panel.
- Demo generator: filter Depository accounts via
  `where(accountable_type: "Depository")` — Rails delegated_type
  generates the `depository?` predicate, not a `.depository` scope.

app/components/savings/progress_ring_component.rb

@@ -1,5 +1,5 @@
 class Savings::ProgressRingComponent < ApplicationComponent
-  SIZE = 180
+  SIZE = 220
   STROKE = 14
   RADIUS = (SIZE - STROKE) / 2.0
   CIRCUMFERENCE = 2 * Math::PI * RADIUS
@@ -19,10 +19,11 @@ class Savings::ProgressRingComponent < ApplicationComponent
   end
 
   def stroke_color
-    case percent
-    when 0...25 then "var(--color-gray-400)"
-    when 25...75 then "var(--color-blue-500)"
-    else "var(--color-green-600)"
+    case goal.status
+    when :reached then "var(--color-green-500)"
+    when :behind then "var(--color-yellow-500)"
+    when :on_track then "var(--color-blue-500)"
+    else "var(--color-gray-400)"
     end
   end