#172 - 변경된 쪽지 스펙에 맞게 수정

[kpeel5839]

1. 🔗 관련 이슈

closes #172

2. 📄 구현한 내용 또는 수정한 내용

제목이 곧 내용입니다.

3. ✅ 배포 Checklist

• 본인을 Assign 해주세요.

[Copilot]

Pull Request Overview

This PR aligns message-related specs to the updated design by adjusting color validation, enriching message view models, and updating notification/content assets.

• Extend hex color validation in StringColor to accept 7-character codes.
• Introduce viewer-based profile accessors in MessageV2 & MessageRoom and refactor overview responses to use a nested profile DTO.
• Update notification imagery, button text/colors, bump submodule commit, and refresh README title.

Reviewed Changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
domain/src/main/kotlin/com/wespot/view/color/StringColor.kt	Allow both 7- and 9-character hex codes but update error message remains outdated.
domain/src/main/kotlin/com/wespot/message/v2/MessageV2.kt	Add my* helper methods for viewer-based profile fields (image, name, school, grade, class).
domain/src/main/kotlin/com/wespot/message/v2/MessageRoom.kt	Simplify boolean return, add sender* wrappers around MessageV2 helpers.
domain/src/main/kotlin/com/wespot/common/NotificationTypeToUpdateFeatureContent.kt	Swap asset URLs and update button label & background color to match new spec.
core/src/main/kotlin/com/wespot/notification/service/EventNotificationService.kt	Clean up imports and reorder EventPublishNotificationService.
core/src/main/kotlin/com/wespot/message/dto/response/MessageV2OverviewResponse.kt	Replace flat fields with nested MessageProfileResponse for sender & receiver profiles.
app/src/main/resources/config	Bump subproject commit reference.
README.md	Change repo heading to "Wespot Backend".

[Copilot]

The exception message "color length must be 9" is now inaccurate since 7-character hex codes are allowed; update it to reflect both supported lengths (e.g., "color length must be 7 or 9").

Suggested change

	throw CustomException(HttpStatus.BAD_REQUEST, ExceptionView.TOAST, "color length must be 9")
	throw CustomException(HttpStatus.BAD_REQUEST, ExceptionView.TOAST, "color length must be 7 or 9")

[Copilot]

[nitpick] These my* methods share the same pattern of branching on receiver, anonymous, or sender; consider extracting a generic helper or using a common accessor to reduce duplication and ease future changes.

Suggested change

	if (viewer.isMeReceiver(receiverId = receiver.id)) {
	return receiver.profile.iconUrl
	}
	if (isMeAnonymous(viewer)) {
	return anonymousProfile!!.imageUrl
	}
	return sender.profile.iconUrl
	}
	fun myName(viewer: User): String {
	validateRoomMessage()
	if (viewer.isMeReceiver(receiverId = receiver.id)) {
	return receiver.name
	}
	if (isMeAnonymous(viewer)) {
	return anonymousProfile!!.name
	}
	return sender.name
	}
	fun mySchoolName(viewer: User): String? {
	validateRoomMessage()
	if (viewer.isMeReceiver(receiverId = receiver.id)) {
	return receiver.school.name
	}
	if (isMeAnonymous(viewer)) {
	return null
	}
	return sender.school.name
	}
	fun myGrade(viewer: User): Int? {
	validateRoomMessage()
	if (viewer.isMeReceiver(receiverId = receiver.id)) {
	return receiver.grade
	}
	if (isMeAnonymous(viewer)) {
	return null
	}
	return sender.grade
	}
	fun myClassNumber(viewer: User): Int? {
	validateRoomMessage()
	if (viewer.isMeReceiver(receiverId = receiver.id)) {
	return receiver.classNumber
	}
	if (isMeAnonymous(viewer)) {
	return null
	}
	return sender.classNumber
	return resolveViewerAttribute(
	viewer = viewer,
	receiverAttribute = { receiver.profile.iconUrl },
	anonymousAttribute = { anonymousProfile!!.imageUrl },
	senderAttribute = { sender.profile.iconUrl }
	)
	}
	fun myName(viewer: User): String {
	validateRoomMessage()
	return resolveViewerAttribute(
	viewer = viewer,
	receiverAttribute = { receiver.name },
	anonymousAttribute = { anonymousProfile!!.name },
	senderAttribute = { sender.name }
	)
	}
	fun mySchoolName(viewer: User): String? {
	validateRoomMessage()
	return resolveViewerAttribute(
	viewer = viewer,
	receiverAttribute = { receiver.school.name },
	anonymousAttribute = { null },
	senderAttribute = { sender.school.name }
	)
	}
	fun myGrade(viewer: User): Int? {
	validateRoomMessage()
	return resolveViewerAttribute(
	viewer = viewer,
	receiverAttribute = { receiver.grade },
	anonymousAttribute = { null },
	senderAttribute = { sender.grade }
	)
	}
	fun myClassNumber(viewer: User): Int? {
	validateRoomMessage()
	return resolveViewerAttribute(
	viewer = viewer,
	receiverAttribute = { receiver.classNumber },
	anonymousAttribute = { null },
	senderAttribute = { sender.classNumber }
	)