fix: improve BreadcrumbTrail truncation and layout within flexible panel headers by adjusting CSS and width calculation constants.

frontend/src/styles/documents/panel-sections.css

@@ -71,7 +71,7 @@
 }
 
 .breadcrumb-trail__link {
-  display: inline-flex;
+  display: block;
   align-items: center;
   max-width: 100%;
   white-space: nowrap;
@@ -83,6 +83,7 @@
   font: inherit;
   color: inherit;
   cursor: default;
+  min-width: 0;
 }
 
 .breadcrumb-trail--measure .breadcrumb-trail__link,
@@ -138,6 +139,11 @@ button.breadcrumb-trail__link,
   max-width: 22rem;
 }
 
+.panel-header__breadcrumbs-wrapper {
+  min-width: 0;
+  flex: 1 1 auto;
+}
+
 .panel-section__body {
   flex: 1;
   display: flex;
@@ -148,4 +154,4 @@ button.breadcrumb-trail__link,
 .panel-section__body--scrollable,
 .panel-section__body.scrollable {
   overflow-y: auto;
-}
+}