Design: ParcelDelivery package tracking layout

[melvincarvalho]

Design PR — edits app.js + app.css only (no app files touched).

• ParcelDelivery gets a package tracking layout (class .card.tracking-card)
  • Dark header strip with tracking number in large monospace + courier name
  • Estimated delivery date prominently centered
  • Vertical 4-step progress timeline: Dispatched → In Transit → Out for Delivery → Delivered
  • Completed steps show green check, current step shows icon in accent with glow ring, future steps are grey
  • Green connecting lines for completed segments, grey for pending
  • Bottom info rows: item shipped + delivery address
  • Dark mode support

Gate: 324 apps pass. Task: #IssDesign2_ParcelDelivery.