bug: metric badges disappear after page reload and on IPFS-saved canvas view

[tnkshuuhei]

Bug

Metric badges on canvas cards disappear in the following scenarios:

1. Page reload — after an agent generates a logic model with metrics, reloading the page causes all metric badges to vanish
2. IPFS-saved canvas — when viewing a canvas loaded from IPFS URL, metric badges are not rendered

Root Cause

cardsToNodes() in lib/canvas/react-flow-utils.ts does not include metrics in node.data. When the canvas state is restored (from localStorage or IPFS props), nodes are created without metric data, so CardNode cannot render the badges.

// cardsToNodes() output — missing metrics
data: {
  id: card.id,
  title: card.title,
  description: card.description,
  color: card.color,
  type: card.type,
  // metrics is absent
}

Meanwhile, CardNode relies on data.metrics to render badges:

{data.metrics && data.metrics.length > 0 && (
  <div>...</div>
)}

Fix

Merge cardMetrics into node.data.metrics during both initialization and localStorage hydration in CanvasContext.tsx.