fix(images): sort toolbar categories alphabetically on the client

D36 promises alphabetical real categories, which held only while the
server sorted them and a restored category was among its list. The page
now sorts them case-insensitively itself, a restored category included.

Failing before: the toolbar listed a server's [zeta, Alpha, beta] in
that order.

tests/browser/workspace-images.spec.mjs

@@ -1544,3 +1544,13 @@ test('unreachable sources and categories announce one error', async ({ page }) =
     await rescan(page);
     await expect(page.getByRole('alert')).toHaveCount(0);
 });
+
+// #249 final review m8: D36's alphabetical categories hold whatever order the server sends.
+test('toolbar categories are alphabetical regardless of server order', async ({ page }) => {
+    await page.route('**/prompt_manager/library/options*', route => route.fulfill({
+        json: { success: true, categories: ['zeta', 'Alpha', 'beta'] },
+    }));
+    await page.goto(workspace);
+    const category = page.getByRole('combobox', { name: 'Filter by category', exact: true });
+    await expect(category.locator('option')).toHaveText(['All categories', 'Alpha', 'beta', 'zeta']);
+});

web/js/workspace/images.mjs

@@ -672,7 +672,10 @@ export function mountImages(main, api, parentScope, {embedded = false, fetchPage
             const data = await api.get('/prompt_manager/library/options', {signal:request.signal});
             if (scope.signal.aborted || request !== categoryRequest) return;
             if (!Array.isArray(data?.categories)) throw new TypeError('Invalid categories');
-            toolbar.setCategories([...data.categories.filter(value => typeof value === 'string'), filters.category]);
+            // D36: alphabetical (case-insensitive) whatever order the server sends, a restored category among them.
+            const names = new Set([...data.categories.filter(value => typeof value === 'string' && value), filters.category]);
+            names.delete('');
+            toolbar.setCategories([...names].sort((a, b) => a.localeCompare(b, 'en-US', {sensitivity:'base'}) || (a < b ? -1 : a > b ? 1 : 0)));
             categoriesFailed = false;
         } catch {
             if (scope.signal.aborted || request !== categoryRequest) return;