Migrate date handling from Date to Temporal API

Routine scheduling, health series, service stamps, session expiry, and
date formatting move to native Temporal (Instant / ZonedDateTime in
UTC), with ISO strings kept at DB and chart boundaries. Ambient types
in src/temporal-ambient.d.ts cover the native runtime; no polyfill.
Observable behavior and stored formats are unchanged.

1 files changed, 9 insertions, 3 deletions

diff --git a/src/lib/server/services/references.test.ts b/src/lib/server/services/references.test.ts
index 1ec3fdb..49c5c94 100644
--- a/src/lib/server/services/references.test.ts
+++ b/src/lib/server/services/references.test.ts
@@ -12,7 +12,9 @@ describe('references service', () => {
 	});
 
 	it('loadForGrocery returns refs for the given grocery', async () => {
-		const now = new Date().toISOString();
+		const now = Temporal.Now.instant().toString({
+			smallestUnit: 'millisecond',
+		});
 		const [g1] = await db
 			.insert(groceries)
 			.values({ name: 'coffee', checked: false, createdAt: now })
@@ -33,7 +35,9 @@ describe('references service', () => {
 	});
 
 	it('add creates a reference', async () => {
-		const now = new Date().toISOString();
+		const now = Temporal.Now.instant().toString({
+			smallestUnit: 'millisecond',
+		});
 		const [g] = await db
 			.insert(groceries)
 			.values({ name: 'pasta', checked: false, createdAt: now })
@@ -51,7 +55,9 @@ describe('references service', () => {
 	});
 
 	it('deleteReference removes the ref', async () => {
-		const now = new Date().toISOString();
+		const now = Temporal.Now.instant().toString({
+			smallestUnit: 'millisecond',
+		});
 		const [g] = await db
 			.insert(groceries)
 			.values({ name: 'rice', checked: false, createdAt: now })