feat: keep Find Work instant during refresh (#213)

frontend/index.html

@@ -1660,15 +1660,20 @@ textarea { resize: vertical; min-height: 120px; }
   async function openFindWorkSheet() {
     findingWork = true;
     qs('#find-work-sheet').classList.add('open');
-    qs('#find-work-list').textContent = '';
-    qs('#find-work-status').textContent = 'Loading available issues…';
+    const retainedItems = findWorkController.items();
+    if (retainedItems.length) renderAvailableIssues(retainedItems);
+    else qs('#find-work-list').textContent = '';
+    qs('#find-work-status').textContent = retainedItems.length ?
+      'Refreshing available issues…' : 'Loading available issues…';
     qs('#load-more-available').hidden = true;
     qs('#close-find-work').focus();
     try {
-      await findWorkController.load();
-      qs('#find-work-status').textContent = findWorkController.items().length ?
-        findWorkController.items().length + ' of ' + availablePagination.total + ' available issues loaded.' :
-        'No unassigned issues are available.';
+      const result = await findWorkController.load();
+      if (!result?.stale) {
+        qs('#find-work-status').textContent = findWorkController.items().length ?
+          findWorkController.items().length + ' of ' + availablePagination.total + ' available issues loaded.' :
+          'No unassigned issues are available.';
+      }
     } catch (error) {
       qs('#find-work-status').textContent = error.message + ' Close and retry.';
     }

frontend/pick-work.js

@@ -39,6 +39,11 @@ function createFindWork({ fetchJson, onItems, onPagination, onStatus }) {
       headers: { Accept: 'application/json' },
     }).then(result => {
       apply(result, append);
+      if (result?.refresh_failed === true) {
+        onStatus('Showing saved available work. Catalog refresh failed; retrying shortly.');
+      } else if (result?.revalidating === true) {
+        onStatus('Showing saved available work while the catalog refreshes…');
+      }
       return result;
     }).finally(() => { loadRequest = null; });
     return loadRequest;