Completing a step removes stalled status from UI

Add `updatedAt` to stalled bubble options so JS can check if the card
was recently updated, matching the `Card::Stallable#stalled?`
logic. Refresh the bubble via Turbo Stream when a step is updated.

This should have been part of #1625

Fixes https://app.fizzy.do/5986089/cards/3668

test/helpers/entropy_helper_test.rb

@@ -0,0 +1,30 @@
+require "test_helper"
+
+class EntropyHelperTest < ActionView::TestCase
+  test "stalled_bubble_options_for returns nil when card has no activity spike" do
+    assert_nil stalled_bubble_options_for(cards(:logo))
+  end
+
+  test "stalled_bubble_options_for returns options when card has activity spike" do
+    card = cards(:logo)
+    card.create_activity_spike!
+
+    options = stalled_bubble_options_for(card)
+    assert_not_nil options
+    assert_equal card.last_activity_spike_at.iso8601, options[:lastActivitySpikeAt]
+  end
+
+  test "stalled_bubble_options_for includes updatedAt for client-side staleness check" do
+    card = cards(:logo)
+    card.create_activity_spike!
+
+    travel_to 3.months.from_now
+
+    # Touch the card to simulate step completion
+    card.touch
+
+    options = stalled_bubble_options_for(card)
+    # The helper must include updatedAt so JS can check if card was recently updated
+    assert_equal card.updated_at.iso8601, options[:updatedAt]
+  end
+end