🚧 Fix dashboard view

frontend/src/style.css

@@ -353,6 +353,16 @@ pre.json {
   margin: 0.5rem 0;
 }
 
+/* Inside table cells (the collapsible payload/attributes blocks): report
+   zero min-width so a long unbreakable JSON value can never stretch the
+   column past the card; min-width:100% fills the actual cell instead and
+   the pre scrolls internally. Applies to Dashboard and Messages alike. */
+details > pre.json {
+  width: 0;
+  min-width: 100%;
+  margin: 0.35rem 0;
+}
+
 [data-theme='dark'] pre.json {
   background: #060b16;
   border: 1px solid var(--border);