feat: type de jauge configurable (compact / standard)

- ServerConfig: champ gauge_type (défaut "compact")
- CSS: classes .gs-* pour la BatteryGauge standard (label + bar 9px + gloss interne)
- Grid: helper renderGaugeRow() — sélectionne compact ou standard selon la config
- Grid: rerenderAll() pour appliquer le changement sans recharger la page
- Popup config serveur: select "Type de jauge" dans la section Affichage des tuiles

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

dashboard/css/app.css

@@ -117,6 +117,17 @@ body{background:var(--bg-1);color:var(--ink-1);font-family:var(--font-ui);font-s
 .g-fill.w{background:var(--warn)}.g-fill.e{background:var(--err)}
 .g-val{font-family:var(--font-mono);font-size:11px;color:var(--ink-2);
        min-width:34px;white-space:nowrap;flex-shrink:0;text-align:right}
+/* Jauge standard (BatteryGauge) */
+.gs-row{display:flex;flex-direction:column;gap:3px}
+.gs-header{display:flex;align-items:center;gap:6px}
+.gs-ico{width:14px;text-align:center;font-size:10px;color:var(--ink-3);flex-shrink:0;cursor:help}
+.gs-lbl{flex:1;font-family:var(--font-terminal);font-size:10px;color:var(--ink-3);letter-spacing:.04em}
+.gs-val{font-family:var(--font-mono);font-size:11px;color:var(--ink-2);white-space:nowrap;flex-shrink:0}
+.gs-bar{position:relative;height:9px;border-radius:3px;background:var(--bg-1);
+        border:1px solid var(--border-1);overflow:hidden;box-shadow:inset 0 1px 2px rgba(0,0,0,.3)}
+.gs-fill{height:100%;border-radius:2px;background:var(--ok);transition:width .3s}
+.gs-fill.w{background:var(--warn)}.gs-fill.e{background:var(--err)}
+.gs-gloss{position:absolute;inset:0;background:linear-gradient(180deg,rgba(255,255,255,.12),transparent);pointer-events:none}
 .tile-foot{font-family:var(--font-terminal);font-size:10px;color:var(--ink-4);
            display:flex;align-items:center;justify-content:space-between;user-select:none}
 .tile-foot-info{display:flex;align-items:center;gap:5px;min-width:0;overflow:hidden}