fixes #219; conflict detection not working

client generates their own updated time, rather than using the servers
response timestamp, meaning if they are not in perfect sync the client
may end up with a more recent time than the servers.

Fixed by using servers timestamp given in http response.

Author: enchant97

backend/handlers/utils.go

@@ -33,6 +33,7 @@ func SetupHandlers(
 		AllowedOrigins:     appConfig.CORSOrigins,
 		AllowedMethods:     []string{"HEAD", "GET", "POST", "PATCH", "PUT", "DELETE"},
 		AllowedHeaders:     []string{"*"},
+		ExposedHeaders:     []string{"Date"},
 		AllowCredentials:   true,
 	}))
 	config := huma.DefaultConfig("Note Mark - API", "0")

frontend/src/core/api.ts

@@ -365,7 +365,7 @@ class Api {
     } catch (e) {
       return e
     }
-    return new Date()
+    return new Date(resp.headers.get("Date") || new Date().toISOString())
   }
   async restoreNoteById(noteId: string): Promise<Result<undefined, ApiError>> {
     let reqURL = `${this.apiServer}/notes/${noteId}/restore`