feat: US-007 - Chat widget — floating button component

src/components/ChatWidget.tsx

@@ -0,0 +1,62 @@
+import { useState } from 'react'
+import { motion, AnimatePresence } from 'framer-motion'
+import { MessageCircle, X } from 'lucide-react'
+
+const prefersReducedMotion = window.matchMedia('(prefers-reduced-motion: reduce)').matches
+
+const buttonVariants = {
+  hidden: prefersReducedMotion
+    ? { opacity: 1, y: 0 }
+    : { opacity: 0, y: 8 },
+  visible: {
+    opacity: 1,
+    y: 0,
+    transition: prefersReducedMotion
+      ? { duration: 0 }
+      : { duration: 0.3, ease: 'easeOut', delay: 1 },
+  },
+}
+
+export function ChatWidget() {
+  const [isOpen, setIsOpen] = useState(false)
+
+  return (
+    <>
+      {/* Chat panel placeholder — wired in US-008 */}
+      <AnimatePresence>
+        {isOpen && null}
+      </AnimatePresence>
+
+      {/* Floating chat button */}
+      <motion.button
+        initial="hidden"
+        animate="visible"
+        variants={buttonVariants}
+        onClick={() => setIsOpen((prev) => !prev)}
+        aria-label={isOpen ? 'Close chat' : 'Open chat'}
+        className="fixed z-[90] cursor-pointer bottom-4 right-4 h-10 w-10 sm:bottom-6 sm:right-6 sm:h-12 sm:w-12"
+        style={{
+          display: 'flex',
+          alignItems: 'center',
+          justifyContent: 'center',
+          borderRadius: '50%',
+          border: 'none',
+          background: 'var(--accent)',
+          color: '#FFFFFF',
+          boxShadow: 'var(--shadow-md)',
+          transition: 'box-shadow 150ms ease-out, transform 150ms ease-out',
+        }}
+        onMouseEnter={(e) => {
+          e.currentTarget.style.boxShadow = 'var(--shadow-lg)'
+          e.currentTarget.style.transform = 'scale(1.05)'
+        }}
+        onMouseLeave={(e) => {
+          e.currentTarget.style.boxShadow = 'var(--shadow-md)'
+          e.currentTarget.style.transform = 'scale(1)'
+        }}
+      >
+        {isOpen ? <X size={20} strokeWidth={2} /> : <MessageCircle size={20} strokeWidth={2} />}
+      </motion.button>
+    </>
+  )
+}

src/components/DashboardLayout.tsx

@@ -14,6 +14,7 @@ import { ParentSection } from './ParentSection'
 import CareerConstellation from './CareerConstellation'
 import { WorkExperienceSubsection } from './WorkExperienceSubsection'
 import { RepeatMedicationsSubsection } from './RepeatMedicationsSubsection'
+import { ChatWidget } from './ChatWidget'
 import { useActiveSection } from '@/hooks/useActiveSection'
 import { useDetailPanel } from '@/contexts/DetailPanelContext'
 import { consultations } from '@/data/consultations'
@@ -418,6 +419,9 @@ export function DashboardLayout() {
 
       {/* Detail panel */}
       <DetailPanel />
+
+      {/* Floating chat widget */}
+      <ChatWidget />
     </div>
   )
 }