Task 18: Add command palette (Ctrl+K)

- Create CommandPalette.tsx with overlay, search input, grouped results,
  keyboard navigation (arrows, Enter, Escape), and footer hints
- Rebuild search.ts with PaletteItem model: 24 entries across 6 sections
  (Experience, Core Skills, Active Projects, Achievements, Education,
  Quick Actions) matching concept HTML structure
- Fuzzy search via fuse.js with weighted keys (title, subtitle, keywords)
- Wire into DashboardLayout with global Ctrl+K listener and TopBar click
- Action system: scroll-to-tile, expand-item, external links, download CV
- Add data-tile-id to all Card/tile components for scroll targeting
- CSS animations: palette-overlay-in, palette-modal-in with
  prefers-reduced-motion support
- Maintain backward-compatible legacy exports for ClinicalSidebar
  (will be removed in Task 21)

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

src/components/tiles/CareerActivityTile.tsx

@@ -374,7 +374,7 @@ export const CareerActivityTile: React.FC = () => {
   )
 
   return (
-    <Card full>
+    <Card full tileId="career-activity">
       <CardHeader dotColor="teal" title="CAREER ACTIVITY" rightText="Full timeline" />
 
       <div className="activity-grid">

src/components/tiles/CoreSkillsTile.tsx

@@ -233,7 +233,7 @@ export function CoreSkillsTile() {
   )
 
   return (
-    <Card>
+    <Card tileId="core-skills">
       <CardHeader dotColor="amber" title="REPEAT MEDICATIONS" />
       <div style={{ display: 'flex', flexDirection: 'column', gap: '10px' }}>
         {skills.map((skill) => (

src/components/tiles/EducationTile.tsx

@@ -22,7 +22,7 @@ export function EducationTile() {
   ]
 
   return (
-    <Card full>
+    <Card full tileId="education">
       <CardHeader dotColor="purple" title="EDUCATION" />
 
       <div style={{ display: 'flex', flexDirection: 'column', gap: '10px' }}>

src/components/tiles/LastConsultationTile.tsx

@@ -30,7 +30,7 @@ export const LastConsultationTile: React.FC = () => {
   }
 
   return (
-    <Card full>
+    <Card full tileId="last-consultation">
       <CardHeader dotColor="green" title="LAST CONSULTATION" rightText="Most recent role" />
 
       {/* Header info row */}

src/components/tiles/LatestResultsTile.tsx

@@ -109,7 +109,7 @@ export function LatestResultsTile() {
   }
 
   return (
-    <Card>
+    <Card tileId="latest-results">
       <CardHeader dotColor="teal" title="LATEST RESULTS" rightText="Updated May 2025" />
       <div style={gridStyles}>
         {kpis.map((kpi) => (

src/components/tiles/PatientSummaryTile.tsx

@@ -10,7 +10,7 @@ export function PatientSummaryTile() {
   }
 
   return (
-    <Card full>
+    <Card full tileId="patient-summary">
       <CardHeader dotColor="teal" title="PATIENT SUMMARY" />
       <div style={bodyStyles}>{personalStatement}</div>
     </Card>

src/components/tiles/ProjectsTile.tsx

@@ -257,7 +257,7 @@ export function ProjectsTile() {
   )
 
   return (
-    <Card full>
+    <Card full tileId="projects">
       <CardHeader dotColor="amber" title="ACTIVE PROJECTS" />
 
       <div style={{ display: 'flex', flexDirection: 'column', gap: '8px' }}>