fix: restyle sentiment cycle page head (borderless, rounded segment, outlined export)

Co-authored-by: multica-agent <github@multica.ai>

app/frontend/pages/sentiment/foundation.css

@@ -948,13 +948,33 @@
 }
 
 .redesigned-page-head #sentimentExportButton {
-  min-height: 28px;
+  min-height: 32px;
 
-  height: 28px;
+  height: 32px;
 
-  padding: 0px 11px;
+  padding: 0px 12px;
+
+  border: 1px solid var(--border-strong);
+
+  border-radius: 8px;
+
+  background: var(--surface);
+
+  color: var(--text-primary);
 
   font-size: 12px;
+
+  font-weight: 500;
+}
+
+.redesigned-page-head #sentimentExportButton:hover {
+  border-color: var(--r2-blue-line);
+
+  color: var(--r2-blue);
+}
+
+#sentimentCycleView .sentiment-cycle-toolbar .toolbar-controls {
+  gap: 8px;
 }
 
 .redesigned-card-head .sentiment-auto-tag,
@@ -1598,7 +1618,7 @@
   background: var(--surface);
 }
 
-:root[data-theme="dark"] :is(.sentiment-cycle-toolbar, .tbl-tools) {
+:root[data-theme="dark"] .tbl-tools {
   border-color: var(--line-soft);
 
   background: var(--surface);
@@ -1612,7 +1632,7 @@
   color: var(--warning-color);
 }
 
-:root[data-theme="dark"] #sentimentCycleView :is(.sentiment-current-tag, .sentiment-auto-tag, .sentiment-detail-toolbar, .section-toolbar) {
+:root[data-theme="dark"] #sentimentCycleView :is(.sentiment-current-tag, .sentiment-auto-tag, .sentiment-detail-toolbar) {
   border-color: var(--border);
 
   background: var(--surface-muted);