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

6 files changed, 17 insertions, 20 deletions

diff --git a/src/lib/server/db/groceries.test.ts b/src/lib/server/db/groceries.test.ts
index 2f8baed..143e4da 100644
--- a/src/lib/server/db/groceries.test.ts
+++ b/src/lib/server/db/groceries.test.ts
@@ -1,14 +1,13 @@
 import { describe, it, expect, beforeEach } from 'vitest';
 import { groceries, categories } from '$lib/server/db/schema';
 import { eq } from 'drizzle-orm';
-import { createTestDb } from './test-helper';
+import { createTestDb, type TestDb } from './test-helper';
 
 describe('groceries add', () => {
-	let db: Awaited<ReturnType<typeof createTestDb>>['db'];
+	let db: TestDb['db'];
 
 	beforeEach(async () => {
-		const testDb = await createTestDb();
-		db = testDb.db;
+		db = (await createTestDb()).db;
 	});
 
 	async function addItem(name: string, categoryId?: number | null) {
diff --git a/src/lib/server/db/ondelete.test.ts b/src/lib/server/db/ondelete.test.ts
index c2c86de..347bb92 100644
--- a/src/lib/server/db/ondelete.test.ts
+++ b/src/lib/server/db/ondelete.test.ts
@@ -1,14 +1,13 @@
 import { describe, it, expect, beforeEach } from 'vitest';
 import { groceries, categories } from '$lib/server/db/schema';
 import { eq } from 'drizzle-orm';
-import { createTestDb } from './test-helper';
+import { createTestDb, type TestDb } from './test-helper';
 
 describe('category delete behavior', () => {
-	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('sets category_id to null when a referenced category is deleted', async () => {
diff --git a/src/lib/server/db/test-helper.ts b/src/lib/server/db/test-helper.ts
index 5bae681..2b8c173 100644
--- a/src/lib/server/db/test-helper.ts
+++ b/src/lib/server/db/test-helper.ts
@@ -11,3 +11,5 @@ export async function createTestDb() {
 
 	return { db, client };
 }
+
+export type TestDb = Awaited<ReturnType<typeof createTestDb>>;
diff --git a/src/lib/server/services/categories.test.ts b/src/lib/server/services/categories.test.ts
index cfde1da..a89b816 100644
--- a/src/lib/server/services/categories.test.ts
+++ b/src/lib/server/services/categories.test.ts
@@ -1,15 +1,14 @@
 import { describe, it, expect, beforeEach } from 'vitest';
 import { groceries, categories } 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 { loadAll, add, deleteCategory } from './categories';
 
 describe('categories 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('loadAll returns categories sorted by name', async () => {
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 () => {
diff --git a/src/lib/server/services/references.test.ts b/src/lib/server/services/references.test.ts
index c02f9e6..1ec3fdb 100644
--- a/src/lib/server/services/references.test.ts
+++ b/src/lib/server/services/references.test.ts
@@ -1,15 +1,14 @@
 import { describe, it, expect, beforeEach } from 'vitest';
 import { groceries, 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 { loadForGrocery, add, deleteReference } from './references';
 
 describe('references 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('loadForGrocery returns refs for the given grocery', async () => {