Merge origin/main: keep gradient/glassmorphism UI, port demo-invite + boot hardening, purge 분신 branding

- Resolve visual-direction conflicts (app_theme, main.dart, signup/onboarding
  screens, index.html) in favor of the soft-gradient + glassmorphism design;
  drop the competing Twin Shadow palette and TwinTokens usage.
- Port non-visual additions from the parallel branch: CORS middleware,
  FlutterError/PlatformDispatcher crash handlers + boot timeout/fallback
  screen in main.dart, and the shared demo-invite feature
  (core-backend/demo.go, demo_test.go, mobile/lib/config.dart), reskinning
  the demo panel to match the glass UI.
- Rename the shared demo invite code DEMO-BUNSIN -> DEMO-YKAVU on both
  client and server so the tester-facing feature keeps working.
- Purge remaining "분신"/"bunsin" identifiers app-wide: Dart package name
  (bunsin_mobile -> ykavu_mobile), Android applicationId/namespace
  (com.bunsin.bunsin_mobile -> com.ykavu.ykavu_mobile, incl. Kotlin source
  dir move), on-device DB filename, keystore alias/docs, PoC draft-generator
  system prompt, and the static web boot placeholder div.

.env.example

@@ -5,6 +5,9 @@ GEMINI_API_KEY=
 # core-backend privileged endpoints (/invites, /admin/metrics, /admin/dashboard, /admin/push-test)
 ADMIN_API_TOKEN=
 
+# Shared demo invite DEMO-YKAVU on signup UI (multiple testers). Set 0 in production.
+ALLOW_DEMO_INVITE=1
+
 # Optional: FCM legacy server key for real push delivery (escalation notify + /admin/push-test).
 # Without this, notifyUser soft-skips and records push_skipped metrics.
 FCM_SERVER_KEY=

core-backend/demo.go

@@ -0,0 +1,94 @@
+package main
+
+import (
+	"log"
+	"net/http"
+	"os"
+	"strings"
+
+	"github.com/gin-gonic/gin"
+	"gorm.io/gorm"
+)
+
+// Shared closed-beta demo invite shown on the Flutter signup screen.
+// Multiple testers can use the same code when ALLOW_DEMO_INVITE is enabled.
+const demoInviteCode = "DEMO-YKAVU"
+
+func demoInviteEnabled() bool {
+	v := strings.TrimSpace(os.Getenv("ALLOW_DEMO_INVITE"))
+	if v == "" {
+		// Default on for local / Phase-1 shared testing. Set ALLOW_DEMO_INVITE=0 in prod.
+		return true
+	}
+	switch strings.ToLower(v) {
+	case "0", "false", "no", "off":
+		return false
+	default:
+		return true
+	}
+}
+
+func isDemoInviteCode(code string) bool {
+	return strings.EqualFold(strings.TrimSpace(code), demoInviteCode)
+}
+
+func seedDemoInvite(db *gorm.DB) {
+	if !demoInviteEnabled() {
+		return
+	}
+	var existing InviteCode
+	err := db.Where("code = ?", demoInviteCode).First(&existing).Error
+	if err == nil {
+		return
+	}
+	if err != gorm.ErrRecordNotFound {
+		log.Printf("demo invite lookup: %v", err)
+		return
+	}
+	inv := InviteCode{
+		Code: demoInviteCode,
+		Note: "shared demo invite (ALLOW_DEMO_INVITE)",
+	}
+	if err := db.Create(&inv).Error; err != nil {
+		log.Printf("demo invite seed failed: %v", err)
+		return
+	}
+	log.Printf("seeded demo invite code %s", demoInviteCode)
+}
+
+func registerDemoRoutes(r *gin.Engine) {
+	r.GET("/demo", func(c *gin.Context) {
+		c.JSON(http.StatusOK, gin.H{
+			"demo_invite_enabled": demoInviteEnabled(),
+			"demo_invite_code":    demoInviteCode,
+			"demo_display_name":   "테스터",
+			"hint":                "회원가입 화면에 표시된 테스트 코드를 그대로 쓰면 됩니다.",
+		})
+	})
+}
+
+// demoSignupInviteCode returns the InviteCode row for demo signups, creating it
+// if needed. Usability checks for "already used" are skipped by the caller.
+func demoSignupInviteCode(db *gorm.DB) (InviteCode, error) {
+	var invite InviteCode
+	err := db.Where("code = ?", demoInviteCode).First(&invite).Error
+	if err == nil {
+		return invite, nil
+	}
+	if err != gorm.ErrRecordNotFound {
+		return InviteCode{}, err
+	}
+	seedDemoInvite(db)
+	err = db.Where("code = ?", demoInviteCode).First(&invite).Error
+	return invite, err
+}
+
+// uniqueDemoUserInvite stores a per-user value on users.invite_code (unique)
+// while still accepting the shared DEMO-YKAVU input.
+func uniqueDemoUserInvite() (string, error) {
+	suffix, err := generateInviteCode()
+	if err != nil {
+		return "", err
+	}
+	return demoInviteCode + "-" + suffix, nil
+}

core-backend/demo_test.go

@@ -0,0 +1,54 @@
+package main
+
+import (
+	"encoding/json"
+	"io"
+	"net/http"
+	"testing"
+)
+
+func TestDemoInviteReusableForMultipleSignups(t *testing.T) {
+	t.Setenv("ALLOW_DEMO_INVITE", "1")
+	server, db := setupTestServer(t)
+	seedDemoInvite(db)
+
+	demoResp, err := http.Get(server.URL + "/demo")
+	if err != nil {
+		t.Fatalf("GET /demo: %v", err)
+	}
+	defer demoResp.Body.Close()
+	var demo map[string]any
+	if err := json.NewDecoder(demoResp.Body).Decode(&demo); err != nil {
+		t.Fatalf("decode demo: %v", err)
+	}
+	if demo["demo_invite_code"] != demoInviteCode {
+		t.Fatalf("demo code: %v", demo["demo_invite_code"])
+	}
+
+	a := postJSON(t, server.URL+"/auth/signup", signupRequest{
+		InviteCode:  demoInviteCode,
+		DisplayName: "테스터A",
+	})
+	defer a.Body.Close()
+	aBody, _ := io.ReadAll(a.Body)
+	if a.StatusCode != http.StatusOK {
+		t.Fatalf("first demo signup: %d %s", a.StatusCode, aBody)
+	}
+
+	b := postJSON(t, server.URL+"/auth/signup", signupRequest{
+		InviteCode:  demoInviteCode,
+		DisplayName: "테스터B",
+	})
+	defer b.Body.Close()
+	bBody, _ := io.ReadAll(b.Body)
+	if b.StatusCode != http.StatusOK {
+		t.Fatalf("second demo signup should reuse code: %d %s", b.StatusCode, bBody)
+	}
+
+	var outA, outB map[string]any
+	_ = json.Unmarshal(aBody, &outA)
+	_ = json.Unmarshal(bBody, &outB)
+	if outA["id"] == outB["id"] {
+		t.Fatalf("expected distinct users, got %#v %#v", outA, outB)
+	}
+}

core-backend/main.go

@@ -49,8 +49,32 @@ type draftMessageRequest struct {
 	K             int      `json:"k"`
 }
 
+// corsMiddleware allows Flutter Web (and other local origins) to call the API.
+// Browsers treat http://localhost:5555 and http://127.0.0.1:8080 as different
+// origins, so Chrome signup fails without OPTIONS + Allow-Origin headers.
+func corsMiddleware() gin.HandlerFunc {
+	return func(c *gin.Context) {
+		origin := c.GetHeader("Origin")
+		if origin == "" {
+			origin = "*"
+		}
+		c.Header("Access-Control-Allow-Origin", origin)
+		c.Header("Vary", "Origin")
+		c.Header("Access-Control-Allow-Credentials", "true")
+		c.Header("Access-Control-Allow-Headers", "Content-Type, Authorization, X-Requested-With")
+		c.Header("Access-Control-Allow-Methods", "GET, POST, PUT, PATCH, DELETE, OPTIONS")
+		c.Header("Access-Control-Max-Age", "600")
+		if c.Request.Method == http.MethodOptions {
+			c.AbortWithStatus(http.StatusNoContent)
+			return
+		}
+		c.Next()
+	}
+}
+
 func setupRouter(db *gorm.DB, relay *ConnectionManager, ai *AIServiceClient) *gin.Engine {
 	r := gin.Default()
+	r.Use(corsMiddleware())
 
 	r.GET("/health", func(c *gin.Context) {
 		c.JSON(http.StatusOK, gin.H{"status": "ok"})
@@ -59,6 +83,7 @@ func setupRouter(db *gorm.DB, relay *ConnectionManager, ai *AIServiceClient) *gi
 	registerA1A2Routes(r, db)
 	registerBRoutes(r, db)
 	registerInviteOpsRoutes(r, db)
+	registerDemoRoutes(r)
 
 	r.GET("/admin/metrics", func(c *gin.Context) {
 		if !requireAdmin(c) {
@@ -138,31 +163,52 @@ func setupRouter(db *gorm.DB, relay *ConnectionManager, ai *AIServiceClient) *gi
 		// 초대 기반 베타(roadmap.md §2.6): 가입은 누군가 실제로 발급한 미사용
 		// 코드가 있어야만 된다 -- 아무 문자열이나 처음 쓰면 통과되던 이전
 		// 방식은 "초대 기반"이 아니었음.
+		//
+		// Shared demo: DEMO-YKAVU (ALLOW_DEMO_INVITE, default on) can be reused
+		// by multiple testers; User.InviteCode still gets a unique stored value.
+		demo := demoInviteEnabled() && isDemoInviteCode(req.InviteCode)
 		var invite InviteCode
-		if err := db.Where("code = ?", req.InviteCode).First(&invite).Error; err != nil {
-			c.JSON(http.StatusBadRequest, gin.H{"detail": "invalid invite code"})
-			return
-		}
-		if ok, detail := inviteUsable(invite, time.Now()); !ok {
-			status := http.StatusBadRequest
-			if detail == "invite code already used" {
-				status = http.StatusConflict
+		storedInvite := req.InviteCode
+		if demo {
+			var err error
+			invite, err = demoSignupInviteCode(db)
+			if err != nil {
+				c.JSON(http.StatusInternalServerError, gin.H{"detail": err.Error()})
+				return
+			}
+			storedInvite, err = uniqueDemoUserInvite()
+			if err != nil {
+				c.JSON(http.StatusInternalServerError, gin.H{"detail": err.Error()})
+				return
+			}
+		} else {
+			if err := db.Where("code = ?", req.InviteCode).First(&invite).Error; err != nil {
+				c.JSON(http.StatusBadRequest, gin.H{"detail": "invalid invite code"})
+				return
+			}
+			if ok, detail := inviteUsable(invite, time.Now()); !ok {
+				status := http.StatusBadRequest
+				if detail == "invite code already used" {
+					status = http.StatusConflict
+				}
+				c.JSON(status, gin.H{"detail": detail})
+				return
 			}
-			c.JSON(status, gin.H{"detail": detail})
-			return
 		}
 
-		user := User{InviteCode: req.InviteCode, DisplayName: req.DisplayName}
+		user := User{InviteCode: storedInvite, DisplayName: req.DisplayName}
 		if err := db.Create(&user).Error; err != nil {
 			c.JSON(http.StatusInternalServerError, gin.H{"detail": err.Error()})
 			return
 		}
 		db.Create(&TwinSettings{UserID: user.ID, AutonomyLevel: AutonomyL0})
 
-		now := time.Now()
-		invite.UsedAt = &now
-		invite.UsedByUserID = &user.ID
-		db.Save(&invite)
+		if !demo {
+			now := time.Now()
+			invite.UsedAt = &now
+			invite.UsedByUserID = &user.ID
+			db.Save(&invite)
+		}
 
 		session, err := createSession(db, user.ID)
 		if err != nil {
@@ -650,6 +696,7 @@ func main() {
 		return
 	}
 	db := openDB()
+	seedDemoInvite(db)
 	relay := newConnectionManager()
 	ai := newAIServiceClient()
 	r := setupRouter(db, relay, ai)

docs/PLANNING.md

@@ -143,7 +143,7 @@
   검색기의 recency 가중치가 키워드 겹침을 압도하는 버그 발견·수정함 (`poc/tone-corpus/README.md`
   "말투 검색기" 참고)
 - [x] 클릭 가능한 프로토타입 제작, 뱃지·거부권 UX 포함 — 읽씹 종결/거부권/에스컬레이션/자율성 설정
-  4개 장면. 공유 링크 docs 앵커: [`prototype.md`](./prototype.md) (`bunsin-prototype`).
+  4개 장면. 공유 링크 docs 앵커: [`prototype.md`](./prototype.md) (`ykavu-prototype`).
   PoC #3 역할극 자극재로 사용
 - [x] "AI 대리 응답 수용성"(Q3) 인터뷰 질문지 작성 — `user-interview-guide.md`
   (질문지만 완료. 5~10명 실제 인터뷰는 아직 미착수 — PoC#3과 이어서 진행 권장)

docs/android-release.md

@@ -16,7 +16,7 @@ v1은 **Android만** 대상 (`tech-design.md` §8). Play 스토어 공개가 아
 2. Master 머신에서 한 번 생성:
 
 ```bash
-keytool -genkey -v -keystore ~/bunsin-release.jks -keyalg RSA -keysize 2048 -validity 10000 -alias bunsin
+keytool -genkey -v -keystore ~/ykavu-release.jks -keyalg RSA -keysize 2048 -validity 10000 -alias ykavu
 ```
 
 3. `mobile/android/key.properties.example`을 복사해 `mobile/android/key.properties` 작성:
@@ -24,8 +24,8 @@ keytool -genkey -v -keystore ~/bunsin-release.jks -keyalg RSA -keysize 2048 -val
 ```
 storePassword=...
 keyPassword=...
-keyAlias=bunsin
-storeFile=/absolute/path/to/bunsin-release.jks
+keyAlias=ykavu
+storeFile=/absolute/path/to/ykavu-release.jks
 ```
 
 4. `key.properties`가 없으면 release 빌드는 **디버그 서명으로 폴백**하며 경고를 낸다

docs/poc-materials.md

@@ -32,7 +32,7 @@
 
 ## 2. PoC #3 역할극 스크립트 (프로토타입 보완용)
 
-`bunsin-prototype` 클릭 프로토타입이 읽씹 종결·본인확인·거부권·에스컬레이션 4장면을 이미
+`ykavu-prototype` 클릭 프로토타입이 읽씹 종결·본인확인·거부권·에스컬레이션 4장면을 이미
 다루므로, 여기서는 프로토타입에 없는 케이스만 스크립트로 보완한다.
 공식 링크 앵커: [`prototype.md`](./prototype.md) (공유 URL은 그 파일의 `SHARE_URL`).
 

docs/prototype.md

@@ -7,7 +7,7 @@ Phase 1 C: PoC #3 역할극에서 쓰는 **클릭 프로토타입**의 공식
 
 | 항목 | 값 |
 |------|-----|
-| **식별자** | `bunsin-prototype` (`poc-materials.md` §2와 동일) |
+| **식별자** | `ykavu-prototype` (`poc-materials.md` §2와 동일) |
 | **공유 URL** | **TBD — Master 기입** (Claude Artifacts 공개 permalink 또는 정적 호스팅 URL) |
 | **docs 앵커** | 이 파일. 다른 문서는 프로토타입을 말할 때 여기로 링크한다 |
 
@@ -33,4 +33,4 @@ SHARE_URL=
 
 1. 프로토타입 장면을 바꾸면 이 파일에 변경일·요약 한 줄을 추가한다.
 2. `SHARE_URL`이 비어 있거나 404면 PoC #3 / 외부 공유 전에 반드시 채운다.
-3. 호스팅을 옮겨도 식별자 `bunsin-prototype`과 이 앵커 문서는 유지한다.
+3. 호스팅을 옮겨도 식별자 `ykavu-prototype`과 이 앵커 문서는 유지한다.

mobile/android/app/build.gradle.kts

@@ -16,7 +16,7 @@ if (hasReleaseKeystore) {
 }
 
 android {
-    namespace = "com.bunsin.bunsin_mobile"
+    namespace = "com.ykavu.ykavu_mobile"
     compileSdk = flutter.compileSdkVersion
     ndkVersion = flutter.ndkVersion
 
@@ -30,7 +30,7 @@ android {
     }
 
     defaultConfig {
-        applicationId = "com.bunsin.bunsin_mobile"
+        applicationId = "com.ykavu.ykavu_mobile"
         minSdk = flutter.minSdkVersion
         targetSdk = flutter.targetSdkVersion
         versionCode = flutter.versionCode

mobile/android/app/src/main/kotlin/com/ykavu/ykavu_mobile/MainActivity.kt

@@ -1,4 +1,4 @@
-package com.bunsin.bunsin_mobile
+package com.ykavu.ykavu_mobile
 
 import io.flutter.embedding.android.FlutterActivity
 

mobile/android/key.properties.example

@@ -1,4 +1,4 @@
 storePassword=replace-me
 keyPassword=replace-me
-keyAlias=bunsin
-storeFile=/absolute/path/to/bunsin-release.jks
+keyAlias=ykavu
+storeFile=/absolute/path/to/ykavu-release.jks

mobile/lib/config.dart

@@ -8,6 +8,12 @@ class AppConfig {
     defaultValue: 'http://10.0.2.2:8080', // Android emulator → host localhost
   );
 
+  /// Shared demo invite (must match core-backend `demoInviteCode`).
+  /// Shown on the signup screen so other testers can join without admin mint.
+  static const demoInviteCode = 'DEMO-YKAVU';
+  static const demoDisplayName = '테스터';
+
+
   static String wsBase() {
     final uri = Uri.parse(coreApiBase);
     final scheme = uri.scheme == 'https' ? 'wss' : 'ws';

mobile/lib/db/app_database_native.dart

@@ -83,7 +83,7 @@ const _kDbPassphrase = 'db_passphrase_v1';
 QueryExecutor _openEncryptedExecutor() {
   return LazyDatabase(() async {
     final dir = await getApplicationDocumentsDirectory();
-    final file = File(p.join(dir.path, 'bunsin_encrypted.db'));
+    final file = File(p.join(dir.path, 'ykavu_encrypted.db'));
     final passphrase = await _loadOrCreatePassphrase();
 
     // Background isolate does not inherit open.overrideFor — re-apply there.

mobile/lib/main.dart

@@ -1,3 +1,4 @@
+import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
 import 'package:provider/provider.dart';
 
@@ -11,13 +12,25 @@ import 'widgets/gradient_backdrop.dart';
 
 void main() {
   WidgetsFlutterBinding.ensureInitialized();
+
+  FlutterError.onError = (details) {
+    FlutterError.presentError(details);
+    debugPrint('FlutterError: ${details.exceptionAsString()}');
+  };
+
+  PlatformDispatcher.instance.onError = (error, stack) {
+    debugPrint('Uncaught: $error\n$stack');
+    return true;
+  };
+
   runApp(const _Bootstrap());
 }
 
 /// Shows [SplashScreen] while [SessionState.restore] is in flight, then
 /// swaps to the real app. Runs `runApp` immediately (rather than awaiting
 /// restore() first) so the branded splash actually paints instead of
-/// leaving a blank frame during the async gap.
+/// leaving a blank frame during the async gap. Falls back to a readable
+/// error screen if restore fails or hangs, rather than crashing silently.
 class _Bootstrap extends StatefulWidget {
   const _Bootstrap();
 
@@ -27,6 +40,8 @@ class _Bootstrap extends StatefulWidget {
 
 class _BootstrapState extends State<_Bootstrap> {
   SessionState? _session;
+  Object? _error;
+  StackTrace? _stackTrace;
 
   @override
   void initState() {
@@ -35,14 +50,38 @@ class _BootstrapState extends State<_Bootstrap> {
   }
 
   Future<void> _init() async {
-    final session = SessionState();
-    await session.restore();
-    if (!mounted) return;
-    setState(() => _session = session);
+    try {
+      final session = SessionState();
+      await session.restore().timeout(const Duration(seconds: 8));
+      if (!mounted) return;
+      setState(() => _session = session);
+    } catch (e, st) {
+      debugPrint('BOOT FAIL: $e\n$st');
+      if (!mounted) return;
+      setState(() {
+        _error = e;
+        _stackTrace = st;
+      });
+    }
   }
 
   @override
   Widget build(BuildContext context) {
+    final error = _error;
+    if (error != null) {
+      return MaterialApp(
+        theme: AppTheme.light(),
+        home: Scaffold(
+          body: SafeArea(
+            child: Padding(
+              padding: const EdgeInsets.all(24),
+              child: SelectableText('앱 시작 실패\n\n$error\n\n${_stackTrace ?? ''}'),
+            ),
+          ),
+        ),
+      );
+    }
+
     final session = _session;
     if (session == null) {
       return MaterialApp(

mobile/lib/screens/data_flow_screen.dart

@@ -31,7 +31,7 @@ class DataFlowScreen extends StatelessWidget {
             width: 36,
             height: 36,
             alignment: Alignment.center,
-            decoration: BoxDecoration(color: tint.withOpacity(0.15), shape: BoxShape.circle),
+            decoration: BoxDecoration(color: tint.withValues(alpha: 0.15), shape: BoxShape.circle),
             child: Icon(icon, size: 18, color: tint),
           ),
           const SizedBox(width: 12),

mobile/lib/screens/onboarding_tone_screen.dart

@@ -106,7 +106,7 @@ class _OnboardingToneScreenState extends State<OnboardingToneScreen> {
             const SizedBox(height: 12),
             FilledButton(
               onPressed: () => _save(markDone: true),
-              child: const Text('저장하고 시작'),
+              child: const Text('이 말투로 시작'),
             ),
           ],
         ),

mobile/lib/screens/signup_screen.dart

@@ -1,7 +1,10 @@
 import 'package:flutter/material.dart';
+import 'package:flutter/services.dart';
 import 'package:provider/provider.dart';
 
+import '../config.dart';
 import '../state/session_state.dart';
+import '../theme/app_theme.dart';
 
 class SignupScreen extends StatefulWidget {
   const SignupScreen({super.key});
@@ -21,6 +24,12 @@ class _SignupScreenState extends State<SignupScreen> {
     super.dispose();
   }
 
+  void _fillDemoCredentials() {
+    _invite.text = AppConfig.demoInviteCode;
+    _name.text = AppConfig.demoDisplayName;
+    setState(() {});
+  }
+
   @override
   Widget build(BuildContext context) {
     final session = context.watch<SessionState>();
@@ -57,9 +66,20 @@ class _SignupScreenState extends State<SignupScreen> {
                 textAlign: TextAlign.center,
                 style: theme.textTheme.bodyLarge?.copyWith(color: scheme.onSurfaceVariant),
               ),
-              const Spacer(flex: 3),
+              const Spacer(flex: 2),
               Text('초대 코드로 클로즈드 베타에 참여합니다', style: theme.textTheme.labelLarge),
               const SizedBox(height: 12),
+              _DemoTestPanel(
+                onFill: _fillDemoCredentials,
+                onCopy: () async {
+                  await Clipboard.setData(const ClipboardData(text: AppConfig.demoInviteCode));
+                  if (!context.mounted) return;
+                  ScaffoldMessenger.of(context).showSnackBar(
+                    const SnackBar(content: Text('테스트 초대 코드를 복사했습니다')),
+                  );
+                },
+              ),
+              const SizedBox(height: 16),
               TextField(
                 controller: _invite,
                 decoration: const InputDecoration(
@@ -67,6 +87,7 @@ class _SignupScreenState extends State<SignupScreen> {
                   prefixIcon: Icon(Icons.vpn_key),
                 ),
                 textInputAction: TextInputAction.next,
+                textCapitalization: TextCapitalization.characters,
               ),
               const SizedBox(height: 12),
               TextField(
@@ -76,19 +97,26 @@ class _SignupScreenState extends State<SignupScreen> {
                   prefixIcon: Icon(Icons.person_outline),
                 ),
                 textInputAction: TextInputAction.done,
+                onSubmitted: (_) {
+                  if (!session.loading) {
+                    session.signup(_invite.text.trim(), _name.text.trim());
+                  }
+                },
               ),
               if (session.error != null) ...[
                 const SizedBox(height: 12),
                 Text(session.error!, style: TextStyle(color: scheme.error)),
               ],
               const SizedBox(height: 20),
-              FilledButton(
-                onPressed: session.loading
-                    ? null
-                    : () => session.signup(_invite.text.trim(), _name.text.trim()),
-                child: session.loading
-                    ? const SizedBox(height: 20, width: 20, child: CircularProgressIndicator(strokeWidth: 2))
-                    : const Text('시작하기'),
+              _PressScale(
+                child: FilledButton(
+                  onPressed: session.loading
+                      ? null
+                      : () => session.signup(_invite.text.trim(), _name.text.trim()),
+                  child: session.loading
+                      ? const SizedBox(height: 20, width: 20, child: CircularProgressIndicator(strokeWidth: 2))
+                      : const Text('시작하기'),
+                ),
               ),
               const SizedBox(height: 32),
             ],
@@ -98,3 +126,97 @@ class _SignupScreenState extends State<SignupScreen> {
     );
   }
 }
+
+/// Visible test credentials so other people can try the closed beta without
+/// asking for a one-off invite mint.
+class _DemoTestPanel extends StatelessWidget {
+  const _DemoTestPanel({required this.onFill, required this.onCopy});
+
+  final VoidCallback onFill;
+  final VoidCallback onCopy;
+
+  @override
+  Widget build(BuildContext context) {
+    final theme = Theme.of(context);
+    final brightness = theme.brightness;
+    return Material(
+      color: AppTheme.glassFill(brightness),
+      borderRadius: BorderRadius.circular(16),
+      child: InkWell(
+        onTap: onFill,
+        borderRadius: BorderRadius.circular(16),
+        child: Container(
+          padding: const EdgeInsets.fromLTRB(16, 14, 12, 14),
+          decoration: BoxDecoration(
+            borderRadius: BorderRadius.circular(16),
+            border: Border.all(color: AppTheme.glassBorder(brightness)),
+          ),
+          child: Column(
+            crossAxisAlignment: CrossAxisAlignment.start,
+            children: [
+              Text(
+                '테스트용 (누구나)',
+                style: theme.textTheme.labelLarge?.copyWith(
+                  color: theme.colorScheme.primary,
+                  letterSpacing: 0.4,
+                ),
+              ),
+              const SizedBox(height: 6),
+              Row(
+                children: [
+                  Expanded(
+                    child: Text(
+                      '초대 코드  ${AppConfig.demoInviteCode}\n표시 이름  ${AppConfig.demoDisplayName}',
+                      style: theme.textTheme.titleSmall?.copyWith(
+                        height: 1.45,
+                        fontWeight: FontWeight.w700,
+                      ),
+                    ),
+                  ),
+                  IconButton(
+                    tooltip: '코드 복사',
+                    onPressed: onCopy,
+                    icon: const Icon(Icons.copy_rounded, size: 20),
+                  ),
+                ],
+              ),
+              const SizedBox(height: 4),
+              Text(
+                '탭하면 입력란에 채워집니다 · 여러 명이 같은 코드로 가입 가능',
+                style: theme.textTheme.bodySmall?.copyWith(color: theme.colorScheme.onSurfaceVariant),
+              ),
+            ],
+          ),
+        ),
+      ),
+    );
+  }
+}
+
+class _PressScale extends StatefulWidget {
+  const _PressScale({required this.child});
+
+  final Widget child;
+
+  @override
+  State<_PressScale> createState() => _PressScaleState();
+}
+
+class _PressScaleState extends State<_PressScale> {
+  var _down = false;
+
+  @override
+  Widget build(BuildContext context) {
+    return Listener(
+      onPointerDown: (_) => setState(() => _down = true),
+      onPointerUp: (_) => setState(() => _down = false),
+      onPointerCancel: (_) => setState(() => _down = false),
+      child: AnimatedScale(
+        scale: _down ? 0.98 : 1,
+        duration: const Duration(milliseconds: 120),
+        curve: Curves.easeOut,
+        child: widget.child,
+      ),
+    );
+  }
+}

mobile/pubspec.lock

@@ -296,6 +296,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "2.1.3"
+  google_fonts:
+    dependency: "direct main"
+    description:
+      name: google_fonts
+      sha256: "517b20870220c48752eafa0ba1a797a092fb22df0d89535fd9991e86ee2cdd9c"
+      url: "https://pub.dev"
+    source: hosted
+    version: "6.3.2"
   graphs:
     dependency: transitive
     description:

mobile/pubspec.yaml

@@ -1,4 +1,4 @@
-name: bunsin_mobile
+name: ykavu_mobile
 description: "A new Flutter project."
 # The following line prevents the package from being accidentally published to
 # pub.dev using `flutter pub publish`. This is preferred for private packages.
@@ -44,6 +44,7 @@ dependencies:
   sqlite3: ^2.9.4
   flutter_secure_storage: ^10.3.1
   sqlcipher_flutter_libs: ^0.6.8
+  google_fonts: ^6.3.2
 
 dev_dependencies:
   flutter_test:

mobile/test/local_db_test.dart

@@ -1,4 +1,4 @@
-import 'package:bunsin_mobile/db/app_database.dart';
+import 'package:ykavu_mobile/db/app_database.dart';
 import 'package:flutter_test/flutter_test.dart';
 
 void main() {

mobile/test/models_test.dart

@@ -1,4 +1,4 @@
-import 'package:bunsin_mobile/models/models.dart';
+import 'package:ykavu_mobile/models/models.dart';
 import 'package:flutter_test/flutter_test.dart';
 
 void main() {

mobile/test/widget_test.dart

@@ -1,5 +1,5 @@
-import 'package:bunsin_mobile/main.dart';
-import 'package:bunsin_mobile/state/session_state.dart';
+import 'package:ykavu_mobile/main.dart';
+import 'package:ykavu_mobile/state/session_state.dart';
 import 'package:flutter_test/flutter_test.dart';
 
 void main() {

poc/tone-corpus/generate_draft.py

@@ -51,7 +51,7 @@ def load_dotenv_if_present():
         break
 
 
-SYSTEM_PROMPT = """너는 어떤 사람의 '분신'이다. 아래 예시 발화들의 말투(어휘, 문장 길이, 이모티콘 습관, 격식 정도)를 \
+SYSTEM_PROMPT = """너는 어떤 사람의 '와카뷰'다. 아래 예시 발화들의 말투(어휘, 문장 길이, 이모티콘 습관, 격식 정도)를 \
 그대로 따라서, 대화의 마지막 메시지에 대한 답장 '초안 하나만' 자연스러운 한국어로 작성해라.
 
 지켜야 할 것:

scripts/push-both.sh

@@ -0,0 +1,8 @@
+#!/usr/bin/env bash
+# Push main to GitHub (origin) and Gitea (gitea) remotes.
+set -euo pipefail
+BRANCH="${1:-main}"
+cd "$(dirname "$0")/.."
+git push -u origin "$BRANCH"
+git push -u gitea "$BRANCH"
+echo "Pushed $BRANCH → origin (GitHub) + gitea (gitea.iykyka.com/oh/iykyka)"