feat: Display biomarkers by category in collapsible sections on the dashboard, including new UI styles and backend category_id in the API response.

backend/src/handlers/biomarkers.rs

@@ -43,6 +43,7 @@ pub struct ReferenceRuleResponse {
 #[derive(Serialize)]
 pub struct BiomarkerListItem {
     pub id: i32,
+    pub category_id: i32,
     pub name: String,
     pub test_category: String,
     pub unit: String,
@@ -62,6 +63,7 @@ pub async fn list_biomarkers(
         .into_iter()
         .map(|b| BiomarkerListItem {
             id: b.id,
+            category_id: b.category_id,
             name: b.name,
             test_category: b.test_category,
             unit: b.unit,

frontend/src/index.css

@@ -386,4 +386,38 @@ select.input {
 
 .btn-danger:hover {
   background-color: color-mix(in srgb, var(--indicator-critical) 10%, transparent);
+}
+
+/* Collapsible header */
+.collapsible-header:hover {
+  background-color: var(--bg-secondary) !important;
+}
+
+/* Biomarker chips */
+.biomarker-chip {
+  display: inline-flex;
+  align-items: center;
+  gap: var(--space-xs);
+  padding: var(--space-xs) var(--space-sm);
+  background-color: var(--bg-secondary);
+  border: 1px solid var(--border);
+  border-radius: var(--radius-md);
+  font-size: 13px;
+  cursor: default;
+  transition: background-color 0.15s;
+}
+
+.biomarker-chip:hover {
+  background-color: color-mix(in srgb, var(--accent) 10%, var(--bg-secondary));
+  border-color: var(--accent);
+}
+
+.biomarker-name {
+  font-weight: 500;
+  color: var(--text-primary);
+}
+
+.biomarker-unit {
+  color: var(--text-secondary);
+  font-size: 11px;
 }

frontend/src/pages/Dashboard.tsx

@@ -8,6 +8,21 @@ interface User {
     role: string
 }
 
+interface Category {
+    id: number
+    name: string
+    description: string | null
+}
+
+interface Biomarker {
+    id: number
+    category_id: number
+    name: string
+    test_category: string
+    unit: string
+    methodology: string | null
+}
+
 export function Dashboard() {
     const navigate = useNavigate()
     const [user, setUser] = useState<User | null>(null)
@@ -15,6 +30,9 @@ export function Dashboard() {
     const [theme, setTheme] = useState(() =>
         document.documentElement.getAttribute('data-theme') || 'light'
     )
+    const [categories, setCategories] = useState<Category[]>([])
+    const [biomarkers, setBiomarkers] = useState<Biomarker[]>([])
+    const [expandedCategories, setExpandedCategories] = useState<Set<number>>(new Set())
 
     useEffect(() => {
         // First get auth info, then fetch full user profile for name
@@ -36,6 +54,15 @@ export function Dashboard() {
             })
             .catch(() => navigate('/login'))
             .finally(() => setLoading(false))
+
+        // Fetch categories and biomarkers
+        Promise.all([
+            fetch('/api/categories', { credentials: 'include' }).then(r => r.json()),
+            fetch('/api/biomarkers', { credentials: 'include' }).then(r => r.json()),
+        ]).then(([cats, bms]) => {
+            setCategories(cats)
+            setBiomarkers(bms)
+        })
     }, [navigate])
 
     const handleLogout = async () => {
@@ -53,6 +80,22 @@ export function Dashboard() {
         setTheme(newTheme)
     }
 
+    const toggleCategory = (categoryId: number) => {
+        setExpandedCategories(prev => {
+            const next = new Set(prev)
+            if (next.has(categoryId)) {
+                next.delete(categoryId)
+            } else {
+                next.add(categoryId)
+            }
+            return next
+        })
+    }
+
+    const getBiomarkersForCategory = (categoryId: number) => {
+        return biomarkers.filter(b => b.category_id === categoryId)
+    }
+
     if (loading) {
         return <div style={{ padding: 'var(--space-lg)' }}>Loading...</div>
     }
@@ -86,8 +129,8 @@ export function Dashboard() {
                 </div>
             </header>
 
-
             <main>
+                {/* User Welcome Card */}
                 <div className="card" style={{ marginBottom: 'var(--space-lg)' }}>
                     <div style={{ display: 'flex', justifyContent: 'space-between', alignItems: 'flex-start' }}>
                         <div>
@@ -102,6 +145,7 @@ export function Dashboard() {
                     </div>
                 </div>
 
+                {/* Admin Section */}
                 {user.role === 'admin' && (
                     <div className="card" style={{ marginBottom: 'var(--space-lg)' }}>
                         <h3 style={{ marginBottom: 'var(--space-sm)' }}>Admin</h3>
@@ -114,9 +158,70 @@ export function Dashboard() {
                     </div>
                 )}
 
-                <p className="text-secondary text-sm">
+                {/* Biomarker Categories */}
-                    Dashboard coming soon...
+                <h2 style={{ marginBottom: 'var(--space-md)' }}>Biomarkers</h2>
-                </p>
+                <div style={{ display: 'flex', flexDirection: 'column', gap: 'var(--space-sm)' }}>
+                    {categories.map(category => {
+                        const categoryBiomarkers = getBiomarkersForCategory(category.id)
+                        const isExpanded = expandedCategories.has(category.id)
+
+                        return (
+                            <div key={category.id} className="card" style={{ padding: 0 }}>
+                                {/* Category Header - Clickable */}
+                                <button
+                                    className="collapsible-header"
+                                    onClick={() => toggleCategory(category.id)}
+                                    style={{
+                                        width: '100%',
+                                        padding: 'var(--space-md)',
+                                        display: 'flex',
+                                        justifyContent: 'space-between',
+                                        alignItems: 'center',
+                                        background: 'none',
+                                        border: 'none',
+                                        cursor: 'pointer',
+                                        textAlign: 'left',
+                                        color: 'var(--text-primary)',
+                                    }}
+                                >
+                                    <div>
+                                        <span style={{ fontSize: '16px', fontWeight: 600 }}>{category.name}</span>
+                                        <span className="text-secondary text-sm" style={{ marginLeft: 'var(--space-sm)' }}>
+                                            ({categoryBiomarkers.length} biomarkers)
+                                        </span>
+                                    </div>
+                                    <span style={{ fontSize: '18px', transition: 'transform 0.2s', transform: isExpanded ? 'rotate(180deg)' : 'rotate(0)' }}>
+                                        ▼
+                                    </span>
+                                </button>
+
+                                {/* Biomarkers List - Collapsible */}
+                                {isExpanded && (
+                                    <div style={{ borderTop: '1px solid var(--border)', padding: 'var(--space-sm)' }}>
+                                        {categoryBiomarkers.length === 0 ? (
+                                            <p className="text-secondary text-sm" style={{ padding: 'var(--space-sm)' }}>
+                                                No biomarkers in this category
+                                            </p>
+                                        ) : (
+                                            <div style={{ display: 'flex', flexWrap: 'wrap', gap: 'var(--space-xs)' }}>
+                                                {categoryBiomarkers.map(biomarker => (
+                                                    <div
+                                                        key={biomarker.id}
+                                                        className="biomarker-chip"
+                                                        title={`${biomarker.name} (${biomarker.unit})`}
+                                                    >
+                                                        <span className="biomarker-name">{biomarker.name}</span>
+                                                        <span className="biomarker-unit">{biomarker.unit}</span>
+                                                    </div>
+                                                ))}
+                                            </div>
+                                        )}
+                                    </div>
+                                )}
+                            </div>
+                        )
+                    })}
+                </div>
             </main>
         </div>
     )