feat: add correction suggestions to vulnerability findings and display them in UI

- Add a `correction` field to every `finding()` call in detect.py with
  actionable remediation advice for all 12 vulnerability types
- Add `CorrectionPanel` component to FindingCard.jsx that renders the
  correction text under the technical details when a card is expanded
- Add `.correction` CSS styles with accent-tinted background and a
  "HOW TO FIX" label to visually distinguish remediation from details

frontend/src/components/FindingCard.jsx

@@ -117,6 +117,16 @@ function DetailsPanel({ details }) {
   return <div className={styles.details}>{parts}</div>
 }
 
+function CorrectionPanel({ text }) {
+  if (!text) return null
+  return (
+    <div className={styles.correction}>
+      <div className={styles.correctionLabel}>How to fix</div>
+      <p className={styles.correctionText}>{text}</p>
+    </div>
+  )
+}
+
 export default function FindingCard({ finding }) {
   const [open, setOpen] = useState(false)
 
@@ -129,7 +139,12 @@ export default function FindingCard({ finding }) {
         </div>
         <span className={`${styles.chevron} ${open ? styles.open : ''}`}>›</span>
       </button>
-      {open && <DetailsPanel details={finding.details} />}
+      {open && (
+        <>
+          <DetailsPanel details={finding.details} />
+          <CorrectionPanel text={finding.correction} />
+        </>
+      )}
     </div>
   )
 }

frontend/src/components/FindingCard.module.css

@@ -151,6 +151,31 @@
   color: var(--text-muted);
 }
 
+/* Correction panel */
+.correction {
+  border-top: 1px solid var(--border);
+  padding: 14px 16px;
+  background: color-mix(in srgb, var(--accent) 8%, var(--bg));
+  display: flex;
+  flex-direction: column;
+  gap: 6px;
+}
+
+.correctionLabel {
+  font-size: 10px;
+  font-weight: 600;
+  text-transform: uppercase;
+  letter-spacing: 0.06em;
+  color: var(--accent);
+}
+
+.correctionText {
+  font-size: 12px;
+  color: var(--text);
+  line-height: 1.6;
+  margin: 0;
+}
+
 /* Key-value */
 .kvList {
   display: flex;