Add Test All Stores button with live per-store results

Click 'Test All' to enter a search query, then each enabled store
is tested sequentially. A 'Test Result' column appears showing:
- Spinner while testing
- Green checkmark with product count and duration on success
- Red X with error on failure
- Disabled stores show dash

Tests run one at a time so results stream in visibly.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/client/src/routes/admin/+page.svelte

@@ -1,11 +1,17 @@
 <script>
-  import { getStores, toggleStore, deleteStore, exportStores, syncStores } from '$lib/api';
+  import { getStores, toggleStore, deleteStore, exportStores, syncStores, testStore } from '$lib/api';
   import { onMount } from 'svelte';
 
   let stores = $state([]);
   let loading = $state(true);
   let syncMessage = $state('');
 
+  // Test all state
+  let testRunning = $state(false);
+  let testQuery = $state('');
+  let showTestPrompt = $state(false);
+  let testResults = $state(new Map());
+
   onMount(async () => {
     try {
       stores = await getStores();
@@ -45,6 +51,57 @@
     syncMessage = `Exported ${result.exported} stores to ${result.directory}/`;
     setTimeout(() => syncMessage = '', 5000);
   }
+
+  function startTestAll() {
+    testQuery = '';
+    testResults = new Map();
+    showTestPrompt = true;
+  }
+
+  async function runTestAll() {
+    if (!testQuery.trim()) return;
+    showTestPrompt = false;
+    testRunning = true;
+    testResults = new Map();
+
+    const enabledStores = stores.filter((s) => s.enabled);
+
+    // Mark all as pending
+    for (const store of enabledStores) {
+      testResults.set(store.id, { status: 'pending' });
+    }
+    testResults = new Map(testResults);
+
+    // Test each store sequentially
+    for (const store of enabledStores) {
+      testResults.set(store.id, { status: 'testing' });
+      testResults = new Map(testResults);
+
+      try {
+        const result = await testStore(store.id, testQuery.trim());
+        testResults.set(store.id, {
+          status: result.success ? 'success' : 'error',
+          resultCount: result.parsedProducts?.length || 0,
+          duration: result.duration,
+          error: result.error,
+        });
+      } catch (err) {
+        testResults.set(store.id, {
+          status: 'error',
+          resultCount: 0,
+          duration: 0,
+          error: err.message || 'Request failed',
+        });
+      }
+      testResults = new Map(testResults);
+    }
+
+    testRunning = false;
+  }
+
+  function getTestResult(storeId) {
+    return testResults.get(storeId);
+  }
 </script>
 
 <div class="h-full flex flex-col">
@@ -52,6 +109,9 @@
   <div class="flex-shrink-0 border-b border-surface-border px-6 py-3 flex items-center justify-between">
     <h1 class="text-sm font-semibold text-text-primary">Stores</h1>
     <div class="flex gap-2">
+      <button onclick={startTestAll} class="btn-secondary text-xs py-1" title="Test all enabled stores" disabled={testRunning}>
+        {testRunning ? 'Testing...' : 'Test All'}
+      </button>
       <button onclick={handleSync} class="btn-secondary text-xs py-1" title="Reload from YAML files">
         Sync from Files
       </button>
@@ -68,6 +128,24 @@
     </div>
   {/if}
 
+  <!-- Test All Prompt -->
+  {#if showTestPrompt}
+    <div class="mx-6 mt-3 card p-4">
+      <p class="text-xs text-text-secondary mb-2">Enter a search term to test all enabled stores:</p>
+      <form onsubmit={(e) => { e.preventDefault(); runTestAll(); }} class="flex gap-2">
+        <input
+          type="text"
+          bind:value={testQuery}
+          placeholder="e.g. logitech m"
+          autofocus
+          class="input-field flex-1"
+        />
+        <button type="submit" class="btn-primary text-xs" disabled={!testQuery.trim()}>Run Tests</button>
+        <button type="button" onclick={() => showTestPrompt = false} class="btn-secondary text-xs">Cancel</button>
+      </form>
+    </div>
+  {/if}
+
   <!-- Content -->
   <div class="flex-1 overflow-y-auto">
     {#if loading}
@@ -92,11 +170,15 @@
             <th class="px-6 py-2.5 text-2xs font-medium text-text-tertiary uppercase tracking-wider">URL</th>
             <th class="px-6 py-2.5 text-2xs font-medium text-text-tertiary uppercase tracking-wider">Category</th>
             <th class="px-6 py-2.5 text-2xs font-medium text-text-tertiary uppercase tracking-wider text-center">Status</th>
+            {#if testResults.size > 0}
+              <th class="px-6 py-2.5 text-2xs font-medium text-text-tertiary uppercase tracking-wider text-center">Test Result</th>
+            {/if}
             <th class="px-6 py-2.5 text-2xs font-medium text-text-tertiary uppercase tracking-wider text-right">Actions</th>
           </tr>
         </thead>
         <tbody>
           {#each stores as store}
+            {@const test = getTestResult(store.id)}
             <tr class="border-b border-surface-border hover:bg-surface-hover/50 transition-colors duration-100">
               <td class="px-6 py-2.5">
                 <span class="text-sm font-medium text-text-primary">{store.name}</span>
@@ -123,6 +205,35 @@
                   {store.enabled ? 'Active' : 'Disabled'}
                 </button>
               </td>
+              {#if testResults.size > 0}
+                <td class="px-6 py-2.5 text-center whitespace-nowrap">
+                  {#if !test || test.status === 'pending'}
+                    <span class="text-2xs text-text-tertiary">—</span>
+                  {:else if test.status === 'testing'}
+                    <span class="inline-flex items-center gap-1.5 text-2xs text-accent-text">
+                      <svg class="w-3 h-3 animate-spin" fill="none" viewBox="0 0 24 24">
+                        <circle class="opacity-25" cx="12" cy="12" r="10" stroke="currentColor" stroke-width="4"></circle>
+                        <path class="opacity-75" fill="currentColor" d="M4 12a8 8 0 018-8V0C5.373 0 0 5.373 0 12h4zm2 5.291A7.962 7.962 0 014 12H0c0 3.042 1.135 5.824 3 7.938l3-2.647z"></path>
+                      </svg>
+                      Testing...
+                    </span>
+                  {:else if test.status === 'success'}
+                    <span class="inline-flex items-center gap-1.5 text-2xs font-medium text-emerald-400">
+                      <svg class="w-3 h-3" fill="none" viewBox="0 0 24 24" stroke="currentColor" stroke-width="2.5">
+                        <path stroke-linecap="round" stroke-linejoin="round" d="M4.5 12.75l6 6 9-13.5" />
+                      </svg>
+                      {test.resultCount} products · {test.duration}ms
+                    </span>
+                  {:else}
+                    <span class="inline-flex items-center gap-1.5 text-2xs font-medium text-red-400" title={test.error}>
+                      <svg class="w-3 h-3" fill="none" viewBox="0 0 24 24" stroke="currentColor" stroke-width="2">
+                        <path stroke-linecap="round" stroke-linejoin="round" d="M6 18L18 6M6 6l12 12" />
+                      </svg>
+                      Failed
+                    </span>
+                  {/if}
+                </td>
+              {/if}
               <td class="px-6 py-2.5 text-right">
                 <div class="flex gap-1 justify-end">
                   <a href="/admin/stores/{store.id}" class="btn-secondary text-xs py-0.5 px-2">Edit</a>