Task 15: Accessibility audit complete

- Sidebar: Replace <aside role="navigation"> with <nav> to avoid conflicting roles
- Sidebar search: Add combobox role, aria-expanded, aria-controls, aria-autocomplete
- Search results: Add listbox/option roles, group labels for screen reader navigation
- PMRInterface: Remove redundant role="main", fix aria-label to use CV-friendly labels
- Mobile search: Add aria-label and type="search" for proper semantics
- Breadcrumb: Add aria-current="page" to current item, aria-hidden on separators
- Clinical alert: Add aria-label="Acknowledge clinical alert" on button per spec
- Patient banner: Change focus:ring to focus-visible:ring on action buttons
- Patient banner: Add role="img" to StatusDot for aria-label accessibility
- Login screen: Change role="status" to role="dialog" with aria-modal
- Login screen: Add loginButtonRef with auto-focus when typing completes
- Login screen: Add focus-visible ring style to Log In button
- Medications tabs: Add id="tab-{id}" to tab buttons, fix aria-labelledby on panels
- Consultations: Wrap entries in <article> per semantic HTML spec
- Problems: Change TrafficLight dot from role="img" to aria-hidden (text label handles it)
- App: Add sr-only live region announcing "Patient Record for Charlwood, Andrew" on PMR entry
- Skip button: Add focus-visible ring for keyboard users

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/components/PatientBanner.tsx

@@ -330,6 +330,7 @@ function StatusDot({ status }: StatusDotProps) {
   return (
     <span
       className={`w-2 h-2 rounded-full ${colorClass} flex-shrink-0`}
+      role="img"
       aria-label={`Status: ${status}`}
     />
   )
@@ -368,7 +369,7 @@ function ActionButton({ icon, label, href, external, compact }: ActionButtonProp
         transition-colors duration-150
         rounded
         font-ui font-medium
-        focus:outline-none focus:ring-2 focus:ring-pmr-nhsblue/40 focus:ring-offset-1 focus:ring-offset-pmr-banner
+        focus:outline-none focus-visible:ring-2 focus-visible:ring-pmr-nhsblue/40 focus-visible:ring-offset-1 focus-visible:ring-offset-pmr-banner
         ${compact ? 'px-2 py-1 text-xs' : 'px-3 py-1.5 text-sm'}
       `}
     >