chore(main): release 0.28.0 (#5866)

.release-please-manifest.json

 {
-  ".": "0.27.1"
+  ".": "0.28.0"
 }

CHANGELOG.md

 # Changelog
 
+## [0.28.0](https://github.com/usememos/memos/compare/v0.27.1...v0.28.0) (2026-04-27)
+
+
+### Features
+
+* **auth:** add SSO user identity linkage ([#5883](https://github.com/usememos/memos/issues/5883)) ([d688914](https://github.com/usememos/memos/commit/d688914b2864791eeadbf21c882608632875f17c))
+* **memos:** choose created or updated time for memos ([#5894](https://github.com/usememos/memos/issues/5894)) ([c268551](https://github.com/usememos/memos/commit/c268551a16929a2cbea6891951feff91926bba59))
+* redesign account and SSO management ([#5886](https://github.com/usememos/memos/issues/5886)) ([ee17998](https://github.com/usememos/memos/commit/ee1799851e88674a6920c7a56d93428fcf95e662))
+
+
+### Bug Fixes
+
+* **auth:** harden authorization and username validation ([#5890](https://github.com/usememos/memos/issues/5890)) ([0fb83a7](https://github.com/usememos/memos/commit/0fb83a745dd5057ade45a3caad2c444af2239113))
+* disable modal prop on DropdownMenu to prevent scroll disappearing ([#5861](https://github.com/usememos/memos/issues/5861)) ([d98f665](https://github.com/usememos/memos/commit/d98f6659190b8d1a8252e64549d9120d85e05d33))
+* fix legacy username auth flows ([#5885](https://github.com/usememos/memos/issues/5885)) ([30c0611](https://github.com/usememos/memos/commit/30c0611a82f9254952a74650095105254f2940e4))
+* **markdown:** split mixed task and bullet lists ([e2c6084](https://github.com/usememos/memos/commit/e2c60845eaff9a78b8d8eb3ccc9a067ef5690976))
+* reduce list memo query overhead ([#5880](https://github.com/usememos/memos/issues/5880)) ([5063804](https://github.com/usememos/memos/commit/50638040f618b02b0c6d010e1d41554c75067517))
+* **web:** preserve task checkbox state ([#5867](https://github.com/usememos/memos/issues/5867)) ([b5863d7](https://github.com/usememos/memos/commit/b5863d76be3cfbf3e0f8237d8e762122b5a0a679))
+
 ## [0.27.1](https://github.com/usememos/memos/compare/v0.27.0...v0.27.1) (2026-04-19)