fix(review): show the pending count on the System Overview review row

The Overview's review row now reads "N ambiguous image links" with the
concept's line, from needs_review.pending. Its Review metadata action
stays aria-disabled until the Needs review page ships. The system specs
and their concept comparison follow the real count.

tests/browser/system-concept.spec.mjs

@@ -169,8 +169,9 @@ function mapOverviewConcept(reference, overview) {
     const relabel = { 'Database integrity': 'Not checked', 'Positive prompts': number(overview.library.positive_prompts),
         'Negative variants': number(overview.library.negative_variants), Images: number(overview.images.indexed) };
     const rows = {
-        // D93 (Q6): no review queue yet, so no count and the action is unavailable (dimmed, as the Save row's D92).
-        '3 ambiguous image links': row => ({ ...row, title: 'Ambiguous image links', description: 'Not available yet.',
+        // D93: the real pending count; the action is unavailable (dimmed, as the Save row's D92) until the review page.
+        '3 ambiguous image links': row => ({ ...row,
+            title: `${number(overview.needs_review.pending)} ambiguous image link${overview.needs_review.pending === 1 ? '' : 's'}`,
             action: { ...row.action, opacity: '0.55', cursor: 'not-allowed' } }),
         // D93: no backup has been recorded (verified backups arrive with S8).
         'Backup status': row => ({ ...row, description: 'No retained backup record.' }),
@@ -230,12 +231,12 @@ for (const theme of THEMES) for (const [width, height] of SIZES) {
     });
 }
 
-// The recorded differences, by path: D93 the review row (title, Not available yet, dimmed action), the backup row, the
+// The recorded differences, by path: D93 the review row (its real count, dimmed action), the backup row, the
 // preferences row and the sources row, and metric 4; D96 the statistics row; D92 the chip, the status and the dimmed
 // Save; D122 the nav label. (The fixture's first three metrics are the concept's own counts.)
 const UNMAPPED_PATHS = [
     'columns.surfaces.0.rows.0.action.cursor', 'columns.surfaces.0.rows.0.action.opacity',
-    'columns.surfaces.0.rows.0.description', 'columns.surfaces.0.rows.0.title', 'columns.surfaces.0.rows.1.description',
+    'columns.surfaces.0.rows.0.title', 'columns.surfaces.0.rows.1.description',
     'columns.surfaces.1.rows.0.description', 'columns.surfaces.1.rows.1.title', 'columns.surfaces.1.rows.2.description',
     'heading.actions.0', 'heading.actions.length', 'metrics.items.3.value', 'nav.label',
     'save.button.cursor', 'save.button.opacity', 'save.status.text',

tests/browser/workspace-system.spec.mjs

@@ -55,6 +55,8 @@ test('overview shows real counts and Not checked', async ({ page, request }) =>
     expect([overview.library.positive_prompts, overview.images.indexed, thumbnails.pending]).toEqual([6, 24, 0]);
     // I2: the Overview never walks the sources for thumbnails; the row reads the status route itself.
     expect(overview).not.toHaveProperty('thumbnails');
+    // The fixture records no ambiguous file: the Needs review queue is empty.
+    expect(overview.needs_review).toEqual({ pending: 0 });
     const layout = await openOverview(page);
     expect(await layout.locator('.summary-metrics > .metric').evaluateAll(items => items.map(item =>
         [item.querySelector('strong').textContent, item.querySelector('span').textContent]))).toEqual([
@@ -64,7 +66,7 @@ test('overview shows real counts and Not checked', async ({ page, request }) =>
         ['Not checked', 'Database integrity'],
     ]);
     expect(await rowsOf(layout, 'Library health')).toEqual([
-        ['Ambiguous image links', 'Not available yet.', 'Review metadata'],
+        ['0 ambiguous image links', 'Review metadata before assigning a positive / negative pair.', 'Review metadata'],
         ['Backup status', 'No retained backup record.', 'View backups'],
         ['No missing thumbnails', 'Generate only missing previews when necessary.', 'Review thumbnails'],
     ]);
@@ -166,10 +168,11 @@ test('a failed thumbnail read is unavailable, never zero', async ({ page }) => {
     await expect(layout.locator('.metric').nth(2).locator('strong')).toHaveText('24');
 });
 
-test('ambiguous row reads Not available yet (Q6)', async ({ page }) => {
+test('ambiguous row reads the pending count; its action waits for the review page', async ({ page }) => {
     const layout = await openOverview(page);
-    const row = layout.locator('.operation').filter({ hasText: 'Ambiguous image links' });
-    await expect(row.locator('p')).toHaveText('Not available yet.');
+    const row = layout.locator('.operation').filter({ hasText: 'ambiguous image links' });
+    await expect(row.locator('h3')).toHaveText('0 ambiguous image links');
+    await expect(row.locator('p')).toHaveText('Review metadata before assigning a positive / negative pair.');
     const review = row.getByRole('button', { name: 'Review metadata', exact: true });
     await expect(review).toHaveAttribute('aria-disabled', 'true');
     await review.click({ force: true });