Fix seatmap slot matching and update member modal layout

docs/NEXT_SESSION_CHECKPOINT.md

@@ -6,6 +6,7 @@
 - latest checked commit: `1d15cf9`
 - main history doc: [DEVELOPMENT_HISTORY.md](/home/hyunho/projects/mh-dashboard-organization/docs/DEVELOPMENT_HISTORY.md)
 - dev/prod protocol: [DEV_PROD_DB_PROTOCOL.md](/home/hyunho/projects/mh-dashboard-organization/docs/DEV_PROD_DB_PROTOCOL.md)
+- regression checklist: [REGRESSION_CHECKLIST.md](/home/hyunho/projects/mh-dashboard-organization/docs/REGRESSION_CHECKLIST.md)
 
 ## What Was Finished
 
@@ -80,6 +81,7 @@
 - 데이터 정본은 `8080` DB
 - `8081` DB는 독립 정본이 아니라 `8080` 기준 복제본처럼 관리해야 함
 - 조직도, 멤버, 자리배치 검증 전에는 `DEV_PROD_DB_PROTOCOL.md`를 먼저 확인
+- 기능 수정 후 완료 판단은 `REGRESSION_CHECKLIST.md`를 기준으로 해야 함
 
 ### Seat Map Save
 
@@ -165,6 +167,7 @@
 - `docs/DEVELOPMENT_HISTORY.md`
 - `docs/NEXT_SESSION_CHECKPOINT.md`
 - `docs/DEV_PROD_DB_PROTOCOL.md`
+- `docs/REGRESSION_CHECKLIST.md`
 - `docs/HISTORY_ASOF_DB_PLAN.md`
 - Gitea 이슈 `#2`, `#5`, `#9`