feat: 引入共享会话状态与未登录占位组件

core/data/src/main/kotlin/com/mingyuan/android_client/core/data/di/DataModule.kt

@@ -4,10 +4,12 @@ import com.mingyuan.android_client.core.data.repository.FakeCheckinRepository
 import com.mingyuan.android_client.core.data.repository.FakeHomeRepository
 import com.mingyuan.android_client.core.data.repository.FakePlanRepository
 import com.mingyuan.android_client.core.data.repository.FakeProfileRepository
+import com.mingyuan.android_client.core.data.repository.FakeSessionRepository
 import com.mingyuan.android_client.core.domain.repository.CheckinRepository
 import com.mingyuan.android_client.core.domain.repository.HomeRepository
 import com.mingyuan.android_client.core.domain.repository.PlanRepository
 import com.mingyuan.android_client.core.domain.repository.ProfileRepository
+import com.mingyuan.android_client.core.domain.repository.SessionRepository
 import dagger.Binds
 import dagger.Module
 import dagger.hilt.InstallIn
@@ -33,4 +35,8 @@ abstract class DataModule {
     @Binds
     @Singleton
     abstract fun bindProfileRepository(impl: FakeProfileRepository): ProfileRepository
+
+    @Binds
+    @Singleton
+    abstract fun bindSessionRepository(impl: FakeSessionRepository): SessionRepository
 }

core/data/src/main/kotlin/com/mingyuan/android_client/core/data/repository/FakeSessionRepository.kt

@@ -0,0 +1,25 @@
+package com.mingyuan.android_client.core.data.repository
+
+import com.mingyuan.android_client.core.domain.repository.SessionRepository
+import kotlinx.coroutines.delay
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.MutableStateFlow
+import javax.inject.Inject
+import javax.inject.Singleton
+
+@Singleton
+class FakeSessionRepository @Inject constructor() : SessionRepository {
+
+    private val _isLoggedIn = MutableStateFlow(true)
+    override val isLoggedIn: Flow<Boolean> = _isLoggedIn
+
+    override suspend fun login() {
+        delay(300)
+        _isLoggedIn.value = true
+    }
+
+    override suspend fun logout() {
+        delay(300)
+        _isLoggedIn.value = false
+    }
+}

core/designsystem/src/main/kotlin/com/mingyuan/android_client/core/designsystem/component/StateViews.kt

@@ -1,9 +1,11 @@
 package com.mingyuan.android_client.core.designsystem.component
 
 import androidx.compose.foundation.background
+import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.height
 import androidx.compose.foundation.layout.padding
@@ -21,6 +23,7 @@ import com.mingyuan.android_client.core.designsystem.theme.ErrorBackground
 import com.mingyuan.android_client.core.designsystem.theme.FaintText
 import com.mingyuan.android_client.core.designsystem.theme.MutedText
 import com.mingyuan.android_client.core.designsystem.theme.NeutralChip
+import com.mingyuan.android_client.core.designsystem.theme.PrimaryText
 
 @Composable
 fun EmptyState(
@@ -65,3 +68,30 @@ fun ErrorState(
         MingyuanButton(text = "重新加载", onClick = onRetry)
     }
 }
+
+@Composable
+fun LoggedOutState(
+    onLogin: (() -> Unit)? = null,
+    modifier: Modifier = Modifier,
+) {
+    Column(
+        modifier = modifier.fillMaxSize(),
+        verticalArrangement = Arrangement.Center,
+        horizontalAlignment = Alignment.CenterHorizontally,
+    ) {
+        Box(
+            modifier = Modifier.size(72.dp).background(NeutralChip, CircleShape),
+            contentAlignment = Alignment.Center,
+        ) {
+            Text("🔒", fontSize = 32.sp)
+        }
+        Spacer(Modifier.height(12.dp))
+        Text("未登录", color = PrimaryText, fontSize = 15.sp, fontWeight = FontWeight.SemiBold)
+        Spacer(Modifier.height(4.dp))
+        Text("登录后即可查看", color = FaintText, fontSize = 13.sp)
+        if (onLogin != null) {
+            Spacer(Modifier.height(16.dp))
+            MingyuanButton(text = "登录", onClick = onLogin)
+        }
+    }
+}

core/domain/src/main/kotlin/com/mingyuan/android_client/core/domain/repository/SessionRepository.kt

@@ -0,0 +1,11 @@
+package com.mingyuan.android_client.core.domain.repository
+
+import kotlinx.coroutines.flow.Flow
+
+interface SessionRepository {
+    val isLoggedIn: Flow<Boolean>
+
+    suspend fun login()
+
+    suspend fun logout()
+}