fix(credential): 多账号会话凭据按请求账号精确匹配；UI微调

- CredentialRepository 快照新增 requestedAccountId，暂存凭据严格按请求账号匹配，
  避免 A 账号刷新期间把暂存凭据误交给默认账号/其他账号
- Dashboard 首页提示与自动签到开关改为卡片样式，开关配色对齐雨晴粉主题
- 默认账号徽标加 maxLines/softWrap 防窄屏换行

app/src/main/java/com/rainy/token/data/repository/CredentialRepository.kt

@@ -40,7 +40,9 @@ class CredentialRepository @Inject constructor(
         val revision: Long,
         val fingerprint: String,
         /** 快照所属账号；单账号服务为 null。 */
-        val accountId: String? = null
+        val accountId: String? = null,
+        /** 创建快照时调用方请求的账号 ID（多账号服务可能是 null=默认账号），用于会话内精确匹配。 */
+        val requestedAccountId: String? = accountId
     ) {
         val service: ServiceType get() = credential.service
     }
@@ -237,9 +239,9 @@ class CredentialRepository @Inject constructor(
             if (session.snapshot.service == service) {
                 val matches = if (ServiceType.isMultiAccount(service)) {
                     val requested = accountId?.takeIf { it.isNotBlank() }
-                    requested == null ||
-                        session.snapshot.accountId == null ||
-                        session.snapshot.accountId == requested
+                    // 只允许读取与快照同一账号的暂存凭据；null=默认账号也要看快照当初请求的是不是默认账号，
+                    // 避免 A 账号刷新期间把 A 的暂存凭据误交给默认账号（B）的读请求。
+                    requested == session.snapshot.requestedAccountId
                 } else {
                     true
                 }
@@ -368,7 +370,8 @@ class CredentialRepository @Inject constructor(
                 credential = credential,
                 revision = revisionFor(service, resolvedId),
                 fingerprint = credentialFingerprint(credential)!!,
-                accountId = resolvedId
+                accountId = resolvedId,
+                requestedAccountId = accountId?.takeIf { it.isNotBlank() }
             )
         }
 

app/src/main/java/com/rainy/token/ui/dashboard/DashboardScreen.kt

@@ -102,6 +102,8 @@ import com.rainy.token.ui.components.AppTips
 import com.rainy.token.ui.components.asString
 import com.rainy.token.ui.dashboard.autocheckin.AutoCheckinManager
 import com.rainy.token.ui.theme.inkMuted
+import com.rainy.token.ui.theme.PureWhite
+import com.rainy.token.ui.theme.inkWarm
 import com.rainy.token.ui.theme.StrawberryPink
 import android.app.AppOpsManager
 import android.appwidget.AppWidgetManager
@@ -347,9 +349,17 @@ fun DashboardScreen(
                         // 随机小技巧提示（每次启动随机一条）+ 最右侧自动签到开关
                         val tipTextRes = remember { AppTips.randomHintRes() }
                         val autoCheckinEnabled by viewModel.autoCheckinEnabled.collectAsStateWithLifecycle()
+                        Card(
+                            modifier = Modifier.fillMaxWidth(),
+                            shape = RoundedCornerShape(16.dp),
+                            colors = CardDefaults.cardColors(
+                                containerColor = MaterialTheme.colorScheme.surface
+                            ),
+                            elevation = CardDefaults.cardElevation(defaultElevation = 0.dp)
+                        ) {
                             Row(
                                 verticalAlignment = Alignment.CenterVertically,
-                            modifier = Modifier.padding(horizontal = 4.dp)
+                                modifier = Modifier.padding(horizontal = 14.dp, vertical = 10.dp)
                             ) {
                                 Text(
                                     text = "💡 " + stringResource(tipTextRes),
@@ -360,15 +370,24 @@ fun DashboardScreen(
                                 Spacer(modifier = Modifier.width(8.dp))
                                 Text(
                                     text = stringResource(R.string.auto_checkin_switch_label),
-                                style = MaterialTheme.typography.labelSmall,
-                                color = inkMuted()
+                                    style = MaterialTheme.typography.labelMedium,
+                                    color = inkWarm(),
+                                    fontWeight = FontWeight.SemiBold
                                 )
                                 Spacer(modifier = Modifier.width(2.dp))
                                 Switch(
                                     checked = autoCheckinEnabled,
                                     onCheckedChange = viewModel::setAutoCheckinEnabled,
-                                colors = SwitchDefaults.colors(checkedThumbColor = StrawberryPink)
+                                    colors = SwitchDefaults.colors(
+                                        checkedThumbColor = PureWhite,
+                                        checkedTrackColor = StrawberryPink,
+                                        checkedBorderColor = StrawberryPink,
+                                        uncheckedThumbColor = MaterialTheme.colorScheme.onSurfaceVariant,
+                                        uncheckedTrackColor = MaterialTheme.colorScheme.surfaceVariant,
+                                        uncheckedBorderColor = MaterialTheme.colorScheme.onSurfaceVariant
                                     )
+                                )
+                            }
                         }
                         val items = rememberDashboardItems(
                             cards = uiState.cards,
@@ -922,6 +941,8 @@ private fun DashboardCard(
                                 text = stringResource(R.string.account_default_badge),
                                 style = MaterialTheme.typography.labelSmall,
                                 color = StrawberryPink,
+                                maxLines = 1,
+                                softWrap = false,
                                 modifier = Modifier
                                     .clip(RoundedCornerShape(8.dp))
                                     .background(StrawberryPink.copy(alpha = 0.12f))

app/src/main/java/com/rainy/token/ui/settings/AccountManagementScreen.kt

@@ -296,6 +296,8 @@ private fun AccountRow(
                             text = stringResource(R.string.account_default_badge),
                             style = MaterialTheme.typography.labelSmall,
                             color = StrawberryPink,
+                            maxLines = 1,
+                            softWrap = false,
                             modifier = Modifier
                                 .padding(horizontal = 6.dp, vertical = 2.dp)
                                 .background(