[FEAT] 채팅 메시지 버블/컴포저 UI 구현 및 버블 크기 동적 조절

GAMSS.xcodeproj/project.pbxproj

@@ -17,16 +17,18 @@
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+		58652E08F4413DEA2016C082 /* MessageBubbleLayoutTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 6EF457567BE11A68704DC4FE /* MessageBubbleLayoutTests.swift */; };
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+		66BC114B170E43E9C900F517 /* QuotedReplyHeaderTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 1B68677BF01B5A8971B85AC4 /* QuotedReplyHeaderTests.swift */; };
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 		A8FEE0AD9A4A60908DC5F5F1 /* CreateMessageRequestDTOTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 7DAA522A6DCECC0B3666523C /* CreateMessageRequestDTOTests.swift */; };
+		A9E97BA8DEC5EE7635B77D1F /* ChatComposerViewTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 3C5DF3BD54F67AE200949A44 /* ChatComposerViewTests.swift */; };
 		ABF5C91182F3B409C1AA9E8E /* GetMessagesUseCaseTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 83A67D7BECCB85A88C969AD7 /* GetMessagesUseCaseTests.swift */; };
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@@ -36,10 +38,12 @@
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+		EA9C48AD6033E92B4734D506 /* MessageTimestampFormatterTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = E5370238416571DC93C29121 /* MessageTimestampFormatterTests.swift */; };
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 		F2D4E5A40F2B3C4D5E6F7A9D /* RadiusTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = C3D4E5A50F2B3C4D5E6F7A9E /* RadiusTests.swift */; };
+		FA90ADA39E7A145713881061 /* MainTabTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 3C15D652D0472A1EBD024674 /* MainTabTests.swift */; };
 /* End PBXBuildFile section */
 
 /* Begin PBXContainerItemProxy section */
@@ -56,13 +60,16 @@
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+		1B68677BF01B5A8971B85AC4 /* QuotedReplyHeaderTests.swift */ = {isa = PBXFileReference; includeInIndex = 1; lastKnownFileType = sourcecode.swift; path = QuotedReplyHeaderTests.swift; sourceTree = "<group>"; };
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 		3C15D652D0472A1EBD024674 /* MainTabTests.swift */ = {isa = PBXFileReference; includeInIndex = 1; lastKnownFileType = sourcecode.swift; path = MainTabTests.swift; sourceTree = "<group>"; };
+		3C5DF3BD54F67AE200949A44 /* ChatComposerViewTests.swift */ = {isa = PBXFileReference; includeInIndex = 1; lastKnownFileType = sourcecode.swift; path = ChatComposerViewTests.swift; sourceTree = "<group>"; };
+		3EDC07CB1FA5BA970388DB6A /* HomeViewModelTests.swift */ = {isa = PBXFileReference; includeInIndex = 1; lastKnownFileType = sourcecode.swift; path = HomeViewModelTests.swift; sourceTree = "<group>"; };
 		41CCBD8A019CAA37319E7984 /* ConversationSummaryPolicyTests.swift */ = {isa = PBXFileReference; includeInIndex = 1; lastKnownFileType = sourcecode.swift; path = ConversationSummaryPolicyTests.swift; sourceTree = "<group>"; };
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+		6EF457567BE11A68704DC4FE /* MessageBubbleLayoutTests.swift */ = {isa = PBXFileReference; includeInIndex = 1; lastKnownFileType = sourcecode.swift; path = MessageBubbleLayoutTests.swift; sourceTree = "<group>"; };
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@@ -83,6 +90,7 @@
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 		DD4444444444444444444444 /* TypographyTests.swift */ = {isa = PBXFileReference; includeInIndex = 1; lastKnownFileType = sourcecode.swift; path = TypographyTests.swift; sourceTree = "<group>"; };
+		E5370238416571DC93C29121 /* MessageTimestampFormatterTests.swift */ = {isa = PBXFileReference; includeInIndex = 1; lastKnownFileType = sourcecode.swift; path = MessageTimestampFormatterTests.swift; sourceTree = "<group>"; };
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@@ -280,6 +288,10 @@
 				BE5C85E76690E41AE394895D /* ChatViewModelTests.swift */,
 				3EDC07CB1FA5BA970388DB6A /* HomeViewModelTests.swift */,
 				3C15D652D0472A1EBD024674 /* MainTabTests.swift */,
+				E5370238416571DC93C29121 /* MessageTimestampFormatterTests.swift */,
+				1B68677BF01B5A8971B85AC4 /* QuotedReplyHeaderTests.swift */,
+				6EF457567BE11A68704DC4FE /* MessageBubbleLayoutTests.swift */,
+				3C5DF3BD54F67AE200949A44 /* ChatComposerViewTests.swift */,
 			);
 			path = Presentation;
 			sourceTree = "<group>";
@@ -588,6 +600,10 @@
 				A8FEE0AD9A4A60908DC5F5F1 /* CreateMessageRequestDTOTests.swift in Sources */,
 				5E6EF3C5D7CE4FF3EE4392EC /* ConversationMessageDTOTests.swift in Sources */,
 				C8DE812C64C04B4EE47E3636 /* DefaultConversationRepositoryTests.swift in Sources */,
+				EA9C48AD6033E92B4734D506 /* MessageTimestampFormatterTests.swift in Sources */,
+				66BC114B170E43E9C900F517 /* QuotedReplyHeaderTests.swift in Sources */,
+				58652E08F4413DEA2016C082 /* MessageBubbleLayoutTests.swift in Sources */,
+				A9E97BA8DEC5EE7635B77D1F /* ChatComposerViewTests.swift in Sources */,
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GAMSS/Sources/App/GAMSSApp.swift

@@ -24,6 +24,10 @@ struct GAMSSApp: App {
     var body: some Scene {
         WindowGroup {
             MainTabView()
+                .preferredColorScheme(.light)
         }
+        // 디자인 토큰이 다크모드 값을 갖고 있지만 디자이너가 아직 다크모드 화면을 설계하지
+        // 않았다 — 시스템 다크모드를 그대로 따라가면 색상이 라이트/다크 목적과 반대로
+        // 뒤집혀 보이므로 앱 전체를 라이트 모드로 고정한다.
     }
 }

GAMSS/Sources/Data/DTO/ConversationMessageDTO.swift

@@ -9,7 +9,8 @@ import Foundation
 
 /// 서버 필드명과 1:1 (Android ConversationMessage.kt 기준). senderType이 "CHARACTER"일 때만
 /// emotionType이 채워진다. senderType이 알 수 없거나 emotionType을 못 알아보면 toDomain()이
-/// nil을 반환 — 잘못된 주체로 그리는 것보다 목록에서 제외하는 쪽을 택한다.
+/// nil을 반환 — 잘못된 주체로 그리는 것보다 목록에서 제외하는 쪽을 택한다. createdAt 파싱
+/// 실패도 같은 이유로 nil을 반환한다.
 struct ConversationMessageDTO: Decodable {
     let id: Int
     let conversationId: Int
@@ -25,6 +26,25 @@ struct ConversationMessageDTO: Decodable {
         "GRUMPY": .prickly, "WARM": .sadness, "QUIRKY": .quirky,
     ]
 
+    /// 화면에는 어차피 분 단위까지만 표시하므로(MessageTimestampFormatter), 소수초 정밀도는
+    /// 필요 없다. 서버가 소수초 포함 타임스탬프(예: "2026-08-07T00:00:00.123Z")를 보내더라도
+    /// 포매터를 두 개 두고 두 번 시도하는 대신, 소수초 부분만 잘라내고 포매터 하나로 파싱한다.
+    /// ISO8601DateFormatter는 동시 접근 안전성이 문서화되어 있지 않아 인스턴스를 static으로
+    /// 공유하지 않고 호출마다 새로 만든다 — 히스토리 로드와 메시지 전송 응답이 동시에 디코딩될
+    /// 수 있기 때문.
+    private static func parseCreatedAt(_ value: String) -> Date? {
+        ISO8601DateFormatter().date(from: stripFractionalSeconds(value))
+    }
+
+    /// 소수초 부분(".123" 등)만 제거한다. 뒤에 타임존 지정자(Z/+/-)가 없어도 소수초 자체는
+    /// 잘라내야 하므로, 그 존재를 전제하지 않고 "."부터 이어지는 숫자만 건너뛴다.
+    private static func stripFractionalSeconds(_ value: String) -> String {
+        guard let dotIndex = value.firstIndex(of: ".") else { return value }
+        let afterDot = value[value.index(after: dotIndex)...]
+        let suffixStart = afterDot.firstIndex(where: { !$0.isNumber }) ?? afterDot.endIndex
+        return String(value[..<dotIndex]) + String(afterDot[suffixStart...])
+    }
+
     func toDomain() -> Message? {
         let sender: MessageSender
         switch senderType {
@@ -36,11 +56,21 @@ struct ConversationMessageDTO: Decodable {
         default:
             return nil
         }
-        return Message(id: id, conversationId: conversationId, sender: sender, content: content, repliesToMessageId: repliesToMessageId)
+        guard let createdAtDate = Self.parseCreatedAt(createdAt) else { return nil }
+        return Message(id: id, conversationId: conversationId, sender: sender, content: content, repliesToMessageId: repliesToMessageId, createdAt: createdAtDate)
     }
 
-    /// 방금 보낸 사용자 메시지 응답 전용 — 항상 .user로 간주한다.
+    /// 방금 보낸 사용자 메시지 응답 전용 — 항상 .user로 간주한다. createdAt 파싱에 실패해도
+    /// (반환 타입이 옵셔널이 아니라) 크래시 없이 현재 시각으로 대체한다 — 서버가 방금 만든
+    /// 응답이라 실제로 실패할 일은 거의 없는 안전망일 뿐이다.
     func toSentUserMessage() -> Message {
-        Message(id: id, conversationId: conversationId, sender: .user, content: content, repliesToMessageId: repliesToMessageId)
+        Message(
+            id: id,
+            conversationId: conversationId,
+            sender: .user,
+            content: content,
+            repliesToMessageId: repliesToMessageId,
+            createdAt: Self.parseCreatedAt(createdAt) ?? Date()
+        )
     }
 }

GAMSS/Sources/Domain/Conversation/Message.swift

@@ -5,6 +5,8 @@
 //  Created by cchanmi on 8/7/26.
 //
 
+import Foundation
+
 enum MessageSender: Equatable {
     case user
     case character(EmotionCharacter)
@@ -16,6 +18,7 @@ struct Message: Identifiable, Equatable {
     let sender: MessageSender
     let content: String
     let repliesToMessageId: Int?
+    let createdAt: Date
 }
 
 enum CommentGenerationStatus: Equatable {