feat: favicons + correctifs tuile (RAM overflow, corbeille droite)

Favicons :
- favicon.svg (scalable, navigateurs modernes)
- favicon.ico (16/32/48px, compatibilité universelle)
- favicon-{16,32,48,96,180,192,512}.png
- favicon-180.png pour apple-touch-icon
- site.webmanifest pour PWA / ajout écran d'accueil Android
- Couleurs Gruvbox : fond #282828, accent orange, LED verte

Tuile :
- g-val : min-width + white-space:nowrap (RAM 3.0Go/5.8Go ne déborde plus)
- tile-foot : justify-content:space-between + tile-foot-info wrapper
  (corbeille alignée en bas à droite)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

dashboard/favicon/favicon.svg

@@ -0,0 +1,11 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 64 64">
+  <!-- Fond arrondi -->
+  <rect width="64" height="64" rx="14" fill="#282828"/>
+  <!-- Cercle accent -->
+  <circle cx="32" cy="32" r="22" fill="none" stroke="#fe8019" stroke-width="4"/>
+  <!-- Barre CPU style jauge -->
+  <rect x="18" y="28" width="28" height="4" rx="2" fill="#504945"/>
+  <rect x="18" y="28" width="18" height="4" rx="2" fill="#fe8019"/>
+  <!-- Point LED vert -->
+  <circle cx="43" cy="21" r="4" fill="#b8bb26"/>
+</svg>

dashboard/favicon/site.webmanifest

@@ -0,0 +1,13 @@
+{
+  "name": "Nanometrics",
+  "short_name": "Nanometrics",
+  "description": "Tableau de bord de surveillance système",
+  "start_url": "/",
+  "display": "standalone",
+  "background_color": "#282828",
+  "theme_color": "#fe8019",
+  "icons": [
+    { "src": "favicon-192.png", "sizes": "192x192", "type": "image/png" },
+    { "src": "favicon-512.png", "sizes": "512x512", "type": "image/png" }
+  ]
+}

dashboard/index.html

@@ -4,6 +4,13 @@
 <meta charset="UTF-8">
 <meta name="viewport" content="width=device-width, initial-scale=1">
 <title>Nanometrics</title>
+<link rel="icon" type="image/x-icon" href="favicon/favicon.ico">
+<link rel="icon" type="image/svg+xml" href="favicon/favicon.svg">
+<link rel="icon" type="image/png" sizes="32x32" href="favicon/favicon-32.png">
+<link rel="icon" type="image/png" sizes="16x16" href="favicon/favicon-16.png">
+<link rel="apple-touch-icon" sizes="180x180" href="favicon/favicon-180.png">
+<link rel="manifest" href="favicon/site.webmanifest">
+<meta name="theme-color" content="#282828">
 <link rel="stylesheet" href="vendor/fontawesome/css/all.min.css">
 <link rel="stylesheet" href="css/app.css">
 </head>