feat: open model details modal on hover and refine cards layout

- Add on-hover modal opening for model cards with debounce
- Keep click-to-open behavior as fallback
- Prevent accidental hover triggers while moving inside same card
- Convert models list to responsive grid layout
- Improve card visual feedback and helper text for interaction

app/web/static/js/app.js

@@ -7,6 +7,8 @@ class LLMMonitorApp {
     constructor() {
         this.worker = null;
         this.selectedModelName = null;
+        this.hoverOpenDelayMs = 180;
+        this.hoverOpenTimer = null;
         this.lastData = {
             health: null,
             models: null
@@ -50,6 +52,49 @@ class LLMMonitorApp {
             this.showModelDetails(decodeURIComponent(modelKey));
         });
 
+        // Apertura modal on-hover (con piccolo delay per evitare aperture involontarie)
+        document.getElementById("models-container")?.addEventListener("mouseover", (event) => {
+            const card = event.target.closest("[data-model-key]");
+            if (!card) {
+                return;
+            }
+
+            // Evita trigger quando il mouse si muove dentro la stessa card
+            if (event.relatedTarget && card.contains(event.relatedTarget)) {
+                return;
+            }
+
+            const modelKey = card.getAttribute("data-model-key");
+            if (!modelKey) {
+                return;
+            }
+
+            if (this.hoverOpenTimer) {
+                clearTimeout(this.hoverOpenTimer);
+            }
+
+            this.hoverOpenTimer = setTimeout(() => {
+                this.showModelDetails(decodeURIComponent(modelKey));
+            }, this.hoverOpenDelayMs);
+        });
+
+        document.getElementById("models-container")?.addEventListener("mouseout", (event) => {
+            const card = event.target.closest("[data-model-key]");
+            if (!card) {
+                return;
+            }
+
+            // Non cancellare se si resta all'interno della stessa card
+            if (event.relatedTarget && card.contains(event.relatedTarget)) {
+                return;
+            }
+
+            if (this.hoverOpenTimer) {
+                clearTimeout(this.hoverOpenTimer);
+                this.hoverOpenTimer = null;
+            }
+        });
+
         // Chiusura modal con pulsante X
         document.getElementById("model-details-close")?.addEventListener("click", () => {
             this.hideModelDetails();
@@ -187,7 +232,7 @@ class LLMMonitorApp {
         const modelName = this.escapeHtml(model.name);
         const modelKey = encodeURIComponent(model.name);
         return `
-            <div data-model-key="${modelKey}" class="bg-gray-700 rounded-lg p-4 border border-gray-600 hover:border-purple-500 transition cursor-pointer">
+            <div data-model-key="${modelKey}" class="bg-gray-700 rounded-lg p-4 border border-gray-600 hover:border-purple-500 hover:-translate-y-0.5 transition cursor-pointer h-full">
                 <div class="flex items-start justify-between mb-3">
                     <h3 class="text-lg font-semibold">${modelName}</h3>
                     <span class="bg-purple-600 px-3 py-1 rounded text-xs font-medium">Caricato</span>
@@ -206,7 +251,7 @@ class LLMMonitorApp {
                     <p class="text-gray-400 text-xs">Digest</p>
                     <p class="font-mono text-xs bg-gray-800 p-2 rounded mt-1 break-all">${this.escapeHtml(model.digest.substring(0, 64))}...</p>
                 </div>
-                <p class="text-xs text-purple-300 mt-3">Clicca per vedere dettagli show</p>
+                <p class="text-xs text-purple-300 mt-3">Passa il mouse o clicca per vedere dettagli show</p>
             </div>
         `;
     }

app/web/templates/index.html

@@ -60,14 +60,17 @@
                 <!-- Models Section -->
                 <div class="bg-gray-800 rounded-lg border border-gray-700 p-6">
                     <div class="flex items-center justify-between mb-6">
+                        <div>
                             <h2 class="text-xl font-bold">Modelli Disponibili</h2>
+                            <p class="text-xs text-gray-400 mt-1">Passa il mouse o clicca una card per aprire la modal dettagli.</p>
+                        </div>
                         <button id="refresh-btn" class="bg-purple-600 hover:bg-purple-700 px-4 py-2 rounded-lg text-sm font-medium transition">
                             🔄 Aggiorna
                         </button>
                     </div>
 
                     <!-- Models List -->
-                    <div id="models-container" class="space-y-4">
+                    <div id="models-container" class="grid grid-cols-1 md:grid-cols-2 xl:grid-cols-3 gap-4">
                         <div class="text-center py-8">
                             <div class="animate-spin inline-block w-8 h-8 border-4 border-gray-600 border-t-purple-500 rounded-full"></div>
                             <p class="text-gray-400 mt-4">Caricamento modelli...</p>