fix: Added collapse arrow styling, stage chevrons, filter right-alignme…

- "frontend/src/App.css"
- "frontend/src/pages/AdminPipeline.tsx"

GSD-Task: S02/T01

frontend/src/App.css

@@ -3704,6 +3704,10 @@ a.app-footer__repo:hover {
 
 /* ── Creator Filter ───────────────────────────────────────────────────────── */
 
+.creator-filter {
+  margin-left: auto;
+}
+
 .creator-filter__select {
   padding: 0.4rem 0.75rem;
   border-radius: 6px;
@@ -4130,18 +4134,17 @@ a.app-footer__repo:hover {
   50% { opacity: 0.4; }
 }
 
-/* Connector line between dots */
+/* Connector chevron between dots */
 .stage-timeline__step + .stage-timeline__step::before {
-  content: "";
+  content: "›";
   display: block;
-  width: 8px;
+  font-size: 0.9rem;
-  height: 1px;
+  color: var(--color-text-muted);
-  background: var(--color-border);
   margin-right: 2px;
 }
 
 .stage-timeline__step--done + .stage-timeline__step::before {
-  background: #00c853;
+  color: #00c853;
 }
 .stage-timeline__elapsed {
   font-size: 0.7rem;
@@ -4190,6 +4193,18 @@ a.app-footer__repo:hover {
   font-weight: 600;
 }
 
+.recent-activity__arrow {
+  flex-shrink: 0;
+  width: 1rem;
+  text-align: center;
+  color: var(--color-text-muted);
+  transition: color 200ms;
+}
+
+.recent-activity__toggle:hover .recent-activity__arrow {
+  color: var(--color-text);
+}
+
 .recent-activity__list {
   max-height: 200px;
   overflow-y: auto;
@@ -5656,3 +5671,30 @@ a.app-footer__about:hover,
     min-width: unset;
   }
 }
+
+/* Responsive: pipeline admin cards on narrow viewports */
+@media (max-width: 768px) {
+  .pipeline-video__header {
+    grid-template-columns: 1fr;
+    gap: 0.5rem;
+  }
+
+  .pipeline-video__header > * {
+    min-width: 0;
+    overflow: hidden;
+    text-overflow: ellipsis;
+  }
+
+  .run-card__header {
+    flex-wrap: wrap;
+  }
+
+  .admin-pipeline__filters {
+    flex-direction: column;
+    align-items: stretch;
+  }
+
+  .creator-filter {
+    margin-left: 0;
+  }
+}

frontend/src/pages/AdminPipeline.tsx

@@ -1423,7 +1423,7 @@ export default function AdminPipeline() {
               activeFilter={activeFilter}
               onFilterChange={setActiveFilter}
             />
-            {creators.length > 1 && (
+            {creators.length >= 1 && (
               <div className="creator-filter">
                 <select
                   className="creator-filter__select"