Align page surfaces and simplify the top-level chrome

Use the home page background across pages, remove redundant titles, and match the usage records tabs and filters to the shared controls. Move the API refresh and add actions beside search, and drop the standalone provider total.

src/styles.css

@@ -1940,7 +1940,8 @@ textarea:focus-visible {
 @container workspace (min-width: 840px) {
   .home-page {
     grid-template-columns: minmax(320px, 1fr) minmax(360px, 1.15fr);
-    grid-auto-rows: 1fr;
+    grid-template-rows: auto auto;
+    grid-auto-rows: unset;
     align-items: stretch;
   }