Persist results to sessionStorage on all pages - prevents data loss on external link clicks

frontend/src/pages/Analyze.tsx

@@ -1,4 +1,4 @@
-import { useState } from 'react'
+import { useState, useEffect } from 'react'
 import { Lightbulb, Loader2, Sparkles } from 'lucide-react'
 import { analyzeSong, type AnalyzeResponse } from '../lib/api'
 import RecommendationCard from '../components/RecommendationCard'
@@ -9,10 +9,21 @@ export default function Analyze() {
   const [title, setTitle] = useState('')
   const [loading, setLoading] = useState(false)
   const [error, setError] = useState('')
-  const [result, setResult] = useState<AnalyzeResponse | null>(null)
+  const [result, setResult] = useState<AnalyzeResponse | null>(() => {
+    try {
+      const saved = sessionStorage.getItem('vynl_analyze_results')
+      return saved ? JSON.parse(saved) : null
+    } catch { return null }
+  })
   const [savingIds, setSavingIds] = useState<Set<string>>(new Set())
   const [dislikingIds, setDislikingIds] = useState<Set<string>>(new Set())
 
+  useEffect(() => {
+    if (result) {
+      sessionStorage.setItem('vynl_analyze_results', JSON.stringify(result))
+    }
+  }, [result])
+
   const handleAnalyze = async () => {
     if (!artist.trim() || !title.trim()) return
     setLoading(true)