Task 4: Add PatientBanner component with full/condensed modes

- Create useScrollCondensation hook with IntersectionObserver
- PatientBanner with 80px full mode and 48px condensed mode
- Smooth height transition (200ms) on scroll past 100px
- Status dot (green) and badge for 'Open to opportunities'
- Action buttons: Download CV, Email, LinkedIn
- NHS blue outlined buttons with hover fill effect
- Proper GPhC number formatting with tooltip
- Sticky positioning for persistent visibility

src/components/PatientBanner.tsx

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+import { Download, Mail, Linkedin } from 'lucide-react'
+import { patient } from '@/data/patient'
+import { useScrollCondensation } from '@/hooks/useScrollCondensation'
+
+export function PatientBanner() {
+  const { isCondensed, sentinelRef } = useScrollCondensation({ threshold: 100 })
+
+  return (
+    <>
+      <div
+        ref={sentinelRef}
+        className="h-0 w-full absolute top-0"
+        aria-hidden="true"
+      />
+      <header
+        className={`
+          sticky top-0 z-40 w-full
+          bg-pmr-banner border-b border-slate-600
+          transition-all duration-200 ease-out
+          ${isCondensed ? 'h-12' : 'h-20'}
+        `}
+        role="banner"
+      >
+        {isCondensed ? (
+          <CondensedBanner />
+        ) : (
+          <FullBanner />
+        )}
+      </header>
+    </>
+  )
+}
+
+function FullBanner() {
+  return (
+    <div className="h-full px-4 lg:px-6 flex flex-col justify-center">
+      <div className="flex items-start justify-between gap-4">
+        <div className="flex-1 min-w-0">
+          <div className="flex items-center gap-3 flex-wrap">
+            <h1 className="font-inter font-semibold text-white text-lg tracking-tight">
+              {patient.name}
+            </h1>
+            <StatusDot status={patient.status} />
+            <span className="text-slate-400 text-sm">{patient.status}</span>
+            <StatusBadge badge={patient.badge} />
+          </div>
+          <div className="flex items-center gap-4 mt-1 flex-wrap text-sm text-slate-300">
+            <span>
+              <span className="text-slate-500">DOB:</span> {patient.dob}
+            </span>
+            <span className="text-slate-500">|</span>
+            <span className="flex items-center gap-1">
+              <span className="text-slate-500">NHS No:</span>{' '}
+              <span className="font-geist" title={patient.nhsNumberTooltip}>
+                {patient.nhsNumber}
+              </span>
+            </span>
+            <span className="text-slate-500">|</span>
+            <span>{patient.address}</span>
+          </div>
+          <div className="flex items-center gap-4 mt-1 flex-wrap text-sm text-slate-300">
+            <a
+              href={`tel:${patient.phone}`}
+              className="hover:text-white transition-colors"
+            >
+              {patient.phone}
+            </a>
+            <span className="text-slate-500">|</span>
+            <a
+              href={`mailto:${patient.email}`}
+              className="hover:text-white transition-colors"
+            >
+              {patient.email}
+            </a>
+          </div>
+        </div>
+        <div className="flex items-center gap-2 flex-shrink-0">
+          <ActionButton
+            icon={<Download size={14} />}
+            label="Download CV"
+            href="/cv.pdf"
+          />
+          <ActionButton
+            icon={<Mail size={14} />}
+            label="Email"
+            href={`mailto:${patient.email}`}
+          />
+          <ActionButton
+            icon={<Linkedin size={14} />}
+            label="LinkedIn"
+            href={`https://${patient.linkedin}`}
+            external
+          />
+        </div>
+      </div>
+    </div>
+  )
+}
+
+function CondensedBanner() {
+  return (
+    <div className="h-full px-4 lg:px-6 flex items-center justify-between gap-4">
+      <div className="flex items-center gap-4 min-w-0">
+        <h1 className="font-inter font-semibold text-white text-sm tracking-tight truncate">
+          {patient.name}
+        </h1>
+        <span className="text-slate-500">|</span>
+        <span className="flex items-center gap-1 text-sm text-slate-300">
+          <span className="text-slate-500">NHS No:</span>{' '}
+          <span className="font-geist" title={patient.nhsNumberTooltip}>
+            {patient.nhsNumber}
+          </span>
+        </span>
+        <span className="text-slate-500">|</span>
+        <StatusDot status={patient.status} />
+      </div>
+      <div className="flex items-center gap-2 flex-shrink-0">
+        <ActionButton
+          icon={<Download size={14} />}
+          label="Download CV"
+          href="/cv.pdf"
+          compact
+        />
+        <ActionButton
+          icon={<Mail size={14} />}
+          label="Email"
+          href={`mailto:${patient.email}`}
+          compact
+        />
+      </div>
+    </div>
+  )
+}
+
+interface StatusDotProps {
+  status: string
+}
+
+function StatusDot({ status }: StatusDotProps) {
+  const colorClass = status === 'Active' ? 'bg-pmr-green' : 'bg-slate-400'
+  return (
+    <span
+      className={`w-2 h-2 rounded-full ${colorClass} flex-shrink-0`}
+      aria-label={`Status: ${status}`}
+    />
+  )
+}
+
+interface StatusBadgeProps {
+  badge: string
+}
+
+function StatusBadge({ badge }: StatusBadgeProps) {
+  return (
+    <span className="px-2 py-0.5 bg-pmr-nhsblue text-white text-xs font-medium rounded-sm">
+      {badge}
+    </span>
+  )
+}
+
+interface ActionButtonProps {
+  icon: React.ReactNode
+  label: string
+  href: string
+  external?: boolean
+  compact?: boolean
+}
+
+function ActionButton({ icon, label, href, external, compact }: ActionButtonProps) {
+  return (
+    <a
+      href={href}
+      target={external ? '_blank' : undefined}
+      rel={external ? 'noopener noreferrer' : undefined}
+      className={`
+        inline-flex items-center gap-1.5
+        border border-pmr-nhsblue text-pmr-nhsblue
+        hover:bg-pmr-nhsblue hover:text-white
+        transition-colors duration-100
+        rounded
+        ${compact ? 'px-2 py-1 text-xs' : 'px-3 py-1.5 text-sm'}
+        font-inter font-medium
+      `}
+    >
+      {icon}
+      <span>{label}</span>
+    </a>
+  )
+}

src/hooks/useScrollCondensation.ts

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+import { useState, useEffect, useRef } from 'react'
+
+interface UseScrollCondensationOptions {
+  threshold?: number
+}
+
+export function useScrollCondensation(options: UseScrollCondensationOptions = {}) {
+  const { threshold = 100 } = options
+  const [isCondensed, setIsCondensed] = useState(false)
+  const sentinelRef = useRef<HTMLDivElement>(null)
+
+  useEffect(() => {
+    const sentinel = sentinelRef.current
+    if (!sentinel) return
+
+    const observer = new IntersectionObserver(
+      (entries) => {
+        const [entry] = entries
+        setIsCondensed(!entry.isIntersecting)
+      },
+      {
+        rootMargin: `-${threshold}px 0px 0px 0px`,
+        threshold: 0,
+      }
+    )
+
+    observer.observe(sentinel)
+
+    return () => {
+      observer.disconnect()
+    }
+  }, [threshold])
+
+  return { isCondensed, sentinelRef }
+}