fix(ui): 移除聊天页顶栏登出按钮；抽屉内容避开系统栏

登出已收进侧边栏；抽屉面板保留全高背景，内容用 systemBars inset 避开状态栏/导航栏。

app/src/main/kotlin/top/yeij/cyrene/ui/chat/ChatScreen.kt

@@ -37,7 +37,6 @@ import top.yukonga.miuix.kmp.basic.IconButton
 import top.yukonga.miuix.kmp.basic.Scaffold
 import top.yukonga.miuix.kmp.basic.SmallTopAppBar
 import top.yukonga.miuix.kmp.basic.Text
-import top.yukonga.miuix.kmp.basic.TextButton
 import top.yukonga.miuix.kmp.basic.TextField
 import top.yukonga.miuix.kmp.icon.MiuixIcons
 import top.yukonga.miuix.kmp.icon.basic.Sidebar
@@ -103,9 +102,6 @@ fun ChatScreen(
                         Icon(imageVector = MiuixIcons.Basic.Sidebar, contentDescription = "菜单")
                     }
                 },
-                actions = {
-                    TextButton("登出", onClick = onLogout)
-                },
             )
         },
         bottomBar = {

app/src/main/kotlin/top/yeij/cyrene/ui/common/MiuixDrawer.kt

@@ -12,10 +12,13 @@ import androidx.compose.foundation.gestures.rememberDraggableState
 import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.ColumnScope
+import androidx.compose.foundation.layout.WindowInsets
 import androidx.compose.foundation.layout.fillMaxHeight
 import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.offset
+import androidx.compose.foundation.layout.systemBars
 import androidx.compose.foundation.layout.width
+import androidx.compose.foundation.layout.windowInsetsPadding
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.derivedStateOf
@@ -198,7 +201,9 @@ fun MiuixDrawer(
                             y = 0,
                         )
                     }
-                    .background(MiuixTheme.colorScheme.surface),
+                    .background(MiuixTheme.colorScheme.surface)
+                    // 面板铺满全高（背景仍到底），内容再避开状态栏 / 导航栏
+                    .windowInsetsPadding(WindowInsets.systemBars),
             ) {
                 drawerContent()
             }