Display user story description as multiline in specs pages

- GherkinHighlighter: Render user story lines (En tant que, Je peux,
  Afin de) in a violet card at the top of feature details
- FeatureView: Remove duplicate description display (now in GherkinHighlighter)
- SpecsPage: Display feature cards in single column layout with
  multiline user story formatting

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/components/specs/FeatureView.tsx

@@ -82,14 +82,9 @@ export function FeatureView({ feature, onBack, onSelectScreen, onSelectStory }:
           )}
         </div>
 
-        <h1 className="text-2xl font-semibold mb-2">
+        <h1 className="text-2xl font-semibold">
           {feature.name.replace(/^US-\d+\s*/, '')}
         </h1>
-        {feature.description && (
-          <p className="text-muted-foreground max-w-3xl">
-            {feature.description}
-          </p>
-        )}
       </div>
 
       <div className="px-4 sm:px-8 py-6">

src/components/specs/GherkinHighlighter.tsx

@@ -121,8 +121,8 @@ export function GherkinHighlighter({ content, scenarioResults = [] }: GherkinHig
         </Button>
       </div>
 
-      {/* Scenario/Background Blocks */}
-      {blocks.filter(b => b.type !== 'header').map((block, blockIndex) => (
+      {/* All Blocks including header */}
+      {blocks.map((block, blockIndex) => (
         <BlockRenderer
           key={blockIndex}
           block={block}
@@ -206,8 +206,31 @@ interface BlockRendererProps {
 
 function BlockRenderer({ block, isCollapsed, onToggle, showDefinitions }: BlockRendererProps) {
   if (block.type === 'header') {
-    // Header is now handled separately in the main component
-    return null;
+    // Extract user story lines (En tant que, Je peux/Je veux, Afin de)
+    const userStoryLines = block.lines.filter(line => {
+      const trimmed = line.trim();
+      return trimmed.startsWith('En tant qu') ||
+             trimmed.startsWith('Je peux') ||
+             trimmed.startsWith('Je veux') ||
+             trimmed.startsWith('Et ') ||
+             trimmed.startsWith('Afin ');
+    });
+
+    if (userStoryLines.length === 0) return null;
+
+    return (
+      <Card className="border-l-4 border-l-violet-500 bg-violet-50/50 dark:bg-violet-950/20">
+        <CardContent className="p-3">
+          <div className="space-y-0.5">
+            {userStoryLines.map((line, index) => (
+              <div key={index} className="text-sm text-foreground">
+                {line.trim()}
+              </div>
+            ))}
+          </div>
+        </CardContent>
+      </Card>
+    );
   }
 
   const restLines = block.lines.slice(1);

src/components/specs/SpecsPage.tsx

@@ -4,7 +4,7 @@ import { categoryLabels, categoryColors, priorityLabels, priorityColors, getStor
 import { getTestStatus, getTestSummary } from '../../data/testResults';
 import { FeatureView } from './FeatureView';
 import { FeatureFilter } from './FeatureFilter';
-import { Card, CardHeader, CardTitle, CardContent, CardDescription } from '../ui/card';
+import { Card, CardHeader, CardTitle, CardContent } from '../ui/card';
 import { Button } from '../ui/button';
 import { ArrowLeft, FileText, Monitor, CheckCircle2, XCircle, AlertCircle, ExternalLink } from 'lucide-react';
 import type { ParsedFeature } from '../../types/gherkin';
@@ -146,7 +146,7 @@ export function SpecsPage({ selectedFeatureId, onBack, onSelectScreen, onSelectS
               </span>
             </div>
 
-            <div className="grid gap-3 sm:gap-4 grid-cols-1 sm:grid-cols-2 lg:grid-cols-3">
+            <div className="flex flex-col gap-3 sm:gap-4">
               {features.map(feature => (
                 <FeatureCard
                   key={feature.id}
@@ -168,6 +168,15 @@ export function SpecsPage({ selectedFeatureId, onBack, onSelectScreen, onSelectS
   );
 }
 
+// Split user story description into separate lines
+function formatUserStory(description: string): string[] {
+  // Split on user story keywords while keeping the keywords
+  return description
+    .split(/(?=En tant qu|Je peux|Je veux|Et |Afin d)/)
+    .map(s => s.trim())
+    .filter(Boolean);
+}
+
 interface FeatureCardProps {
   feature: ParsedFeature;
   onClick: () => void;
@@ -230,9 +239,13 @@ function FeatureCard({ feature, onClick }: FeatureCardProps) {
       </CardHeader>
       <CardContent>
         {feature.description && (
-          <CardDescription className="line-clamp-2 text-sm mb-3">
-            {feature.description}
-          </CardDescription>
+          <div className="text-sm text-muted-foreground mb-3 space-y-1">
+            {formatUserStory(feature.description).map((line, i) => (
+              <div key={i} className="leading-snug">
+                {line}
+              </div>
+            ))}
+          </div>
         )}
         <div className="flex items-center gap-4 text-xs text-muted-foreground">
           <span className="flex items-center gap-1">