fix: regression: sort day by fileCreatedAt again (#18732)

* fix: regression: sort day by fileCreatedAt again

* lint

* e2e test

* inline function

* e2e

* Address comments. Drop dayGroup and timezone in favor of localOffsetMinutes

* lint and some api-doc

* lint, more api-doc

* format

* Move minutes to fractional hours

* make sql

* merge/conflict

* merge fallout, review comments

* spelling

* drop offset from returned date

* move description into decorator where possible, regen api

e2e/src/api/specs/timeline.e2e-spec.ts

@@ -75,8 +75,8 @@ describe('/timeline', () => {
       expect(status).toBe(200);
       expect(body).toEqual(
         expect.arrayContaining([
-          { count: 3, timeBucket: '1970-02-01T00:00:00.000Z' },
-          { count: 1, timeBucket: '1970-01-01T00:00:00.000Z' },
+          { count: 3, timeBucket: '1970-02-01' },
+          { count: 1, timeBucket: '1970-01-01' },
         ]),
       );
     });
@@ -167,7 +167,8 @@ describe('/timeline', () => {
         isImage: [],
         isTrashed: [],
         livePhotoVideoId: [],
-        localDateTime: [],
+        fileCreatedAt: [],
+        localOffsetHours: [],
         ownerId: [],
         projectionType: [],
         ratio: [],
@@ -204,7 +205,8 @@ describe('/timeline', () => {
         isImage: [],
         isTrashed: [],
         livePhotoVideoId: [],
-        localDateTime: [],
+        fileCreatedAt: [],
+        localOffsetHours: [],
         ownerId: [],
         projectionType: [],
         ratio: [],