Give Galaxy timestamp cards double-width boxes

The Last Deploy and Last Refresh metric cards hold full timestamps that
wrapped to three or four lines in a single-width card. Add a Wide option
to MetricCard (grid-column: span 2) and set it on both Galaxy timestamp
cards. Also switch .metric-value to overflow-wrap: break-word so a date
token is never split mid-value.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/MxGateway.Server/Dashboard/Components/Shared/MetricCard.razor

@@ -1,4 +1,4 @@
-<div class="card metric-card h-100">
+<div class="card metric-card h-100@(Wide ? " metric-card-wide" : string.Empty)">
     <div class="card-body">
         <div class="metric-label">@Label</div>
         <div class="metric-value">@Value</div>
@@ -18,4 +18,8 @@
 
     [Parameter]
     public string? Detail { get; set; }
+
+    /// <summary>Spans the card across two grid columns for long values such as timestamps.</summary>
+    [Parameter]
+    public bool Wide { get; set; }
 }