fix: remove size prop from Emoji component for consistency

- Eliminated the size prop from the Emoji component across various files to standardize rendering and improve code cleanliness.

src/components/dashboard/ProductivityAnalytics.tsx

@@ -91,7 +91,7 @@ export function ProductivityAnalytics({ metrics, deadlineMetrics, tagMetrics, se
 
       {/* Titre de section Analytics */}
       <div className="flex items-center justify-between">
-        <h2 className="text-2xl font-bold"><Emoji emoji="📊" size={20} /> Analytics & Métriques</h2>
+        <h2 className="text-2xl font-bold"><Emoji emoji="📊" /> Analytics & Métriques</h2>
         <div className="text-sm text-[var(--muted-foreground)]">
           Derniers 30 jours
         </div>
@@ -142,7 +142,7 @@ export function ProductivityAnalytics({ metrics, deadlineMetrics, tagMetrics, se
 
       {/* Insights automatiques */}
       <Card variant="glass" className="p-6">
-        <h3 className="text-lg font-semibold mb-4"><Emoji emoji="💡" size={25} /> Insights</h3>
+        <h3 className="text-lg font-semibold mb-4"><Emoji emoji="💡" /> Insights</h3>
         <div className="grid grid-cols-1 md:grid-cols-3 gap-4">
           <MetricCard
             title="Vélocité Moyenne"