[Frontend] Build StatusTimeline Component

[mftee]

Description:
Create a visual timeline component that displays the shipment's status history as a vertical list. Used on the shipment detail page sidebar.

Create frontend/components/shipment/status-timeline.tsx.

Acceptance Criteria:

• 'use client' directive
• Accepts history: ShipmentStatusHistory[] prop
• Renders an ordered list with a left vertical border
• Each entry shows: a colored circular dot (matching the status color), status name (humanized), date/time formatted with month/day/year + time, "by FirstName LastName", and reason in italics (if present)
• Dot colors match the StatusBadge color scheme per status
• Shows a short icon/symbol inside the dot per status (e.g. ✓ for accepted, → for in-transit, ★ for completed, ✕ for cancelled, ! for disputed)
• If history.length === 0, shows "No history yet."
• Uses cn() for dynamic class composition