ui(users): record last_login on /setup + sortable headers

web/styles/input.css

@@ -328,12 +328,20 @@
     text-transform: uppercase; letter-spacing: 0.08em;
   }
   .audit-row.head:hover { background: transparent; }
-  .audit-row.head .sort-header {
+  /* Sort-header link styling — shared by .audit-row and .user-row
+     (and any other future sortable table headers). The selectors
+     scope to .head rows so hover and accent-glyph treatment only
+     apply to the header, not data rows that happen to contain a
+     <a class="sort-header">. */
+  .audit-row.head .sort-header,
+  .user-row.head .sort-header {
     color: inherit; text-decoration: none; cursor: pointer;
     display: inline-flex; align-items: baseline; gap: 4px;
   }
-  .audit-row.head .sort-header:hover { color: var(--ink); }
-  .audit-row.head .sort-glyph {
+  .audit-row.head .sort-header:hover,
+  .user-row.head .sort-header:hover { color: var(--ink); }
+  .audit-row.head .sort-glyph,
+  .user-row.head .sort-glyph {
     font-size: 9px; color: var(--accent);
     /* keep the row height stable when the glyph appears/disappears */
     min-width: 8px; display: inline-block;