Consolidate duplicated page CSS into app.css, share TestDb type

- Move .page-header/.back-link/.input-invalid/.save-status/.btn-done
  (plus hover/variant rules) into app.css as shared route scaffolding;
  delete per-page scoped copies
- Unify drifted values: page-header padding 1rem -> 1.25rem (routine
  page), empty-state spacing 0.75/1.5rem -> 1/2rem (grocery detail),
  save-status margin -0.25rem applied on both pages, back-link margin
  1.5rem -> 1rem (grocery detail); routine page's large Fait button is
  kept via a .btn-done-lg modifier
- Export TestDb from test-helper and use it in the five db/service
  test files to shrink duplicated fixture scaffolding

1 files changed, 3 insertions, 4 deletions

diff --git a/src/lib/server/services/groceries.test.ts b/src/lib/server/services/groceries.test.ts
index 83f8d95..a704b57 100644
--- a/src/lib/server/services/groceries.test.ts
+++ b/src/lib/server/services/groceries.test.ts
@@ -1,7 +1,7 @@
 import { describe, it, expect, beforeEach } from 'vitest';
 import { groceries, categories, references } from '$lib/server/db/schema';
 import { eq } from 'drizzle-orm';
-import { createTestDb } from '$lib/server/db/test-helper';
+import { createTestDb, type TestDb } from '$lib/server/db/test-helper';
 import {
 	loadUnchecked,
 	loadAll,
@@ -11,11 +11,10 @@ import {
 } from './groceries';
 
 describe('groceries service', () => {
-	let db: Awaited<ReturnType<typeof createTestDb>>['db'];
+	let db: TestDb['db'];
 
 	beforeEach(async () => {
-		const testDb = await createTestDb();
-		db = testDb.db;
+		db = (await createTestDb()).db;
 	});
 
 	it('loadUnchecked returns only unchecked items', async () => {