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/wwwroot/css/dashboard.css

@@ -88,6 +88,8 @@ body.dashboard-body { min-height: 100vh; }
   letter-spacing: 0.07em;
   color: var(--ink-faint);
 }
+.metric-card-wide { grid-column: span 2; }
+
 .metric-value {
   margin-top: 0.25rem;
   font-family: var(--mono);
@@ -96,7 +98,8 @@ body.dashboard-body { min-height: 100vh; }
   font-weight: 600;
   line-height: 1.1;
   color: var(--ink);
-  overflow-wrap: anywhere;
+  /* break-word, not anywhere: keep date/number tokens whole, wrap at spaces. */
+  overflow-wrap: break-word;
 }
 .metric-detail {
   margin-top: 0.15rem;