cleanup: 提取 Activity 基类、修复 Compose 状态、精简资源

A. 提取 Activity 共用代码：
- 新增 BaseActivity 基类，统一处理 enableEdgeToEdge 和 slide 转场动画
- 5 个子 Activity 从 ~212 行简化为 ~50 行，减少 150+ 行重复代码

B. 修复 Compose 状态问题：
- BottomCardArea: 移除对 selectedDate/isCollapsed 的独立 StateFlow 订阅，
  统一使用 uiState 聚合流
- 替换脆弱的 SideEffect 帧计数器为显式 LaunchedEffect + delay(32)

C. 资源精简：
- 删除 mipmap-mdpi 和 mipmap-hdpi 密度（现代设备已被覆盖）

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

app/src/main/kotlin/plus/rua/project/AboutActivity.kt

@@ -1,46 +1,19 @@
 package plus.rua.project
 
 import android.content.Intent
-import android.os.Build
 import android.os.Bundle
-import androidx.activity.ComponentActivity
 import androidx.activity.compose.setContent
-import androidx.activity.enableEdgeToEdge
 import plus.rua.project.ui.AboutScreen
 
-class AboutActivity : ComponentActivity() {
+class AboutActivity : BaseActivity() {
     override fun onCreate(savedInstanceState: Bundle?) {
-        enableEdgeToEdge()
         super.onCreate(savedInstanceState)
 
-        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.UPSIDE_DOWN_CAKE) {
-            overrideActivityTransition(
-                OVERRIDE_TRANSITION_OPEN,
-                R.anim.slide_in_right,
-                R.anim.slide_out_left
-            )
-            overrideActivityTransition(
-                OVERRIDE_TRANSITION_CLOSE,
-                R.anim.slide_in_left,
-                R.anim.slide_out_right
-            )
-        }
-
         setContent {
             AboutScreen(
-                onBack = {
+                onBack = { finishWithSlideBack() },
-                    finish()
-                    if (Build.VERSION.SDK_INT < Build.VERSION_CODES.UPSIDE_DOWN_CAKE) {
-                        @Suppress("DEPRECATION")
-                        overridePendingTransition(R.anim.slide_in_left, R.anim.slide_out_right)
-                    }
-                },
                 onNavigateToLicenses = {
-                    startActivity(Intent(this, LicensesActivity::class.java))
+                    startActivityWithSlide(Intent(this, LicensesActivity::class.java))
-                    if (Build.VERSION.SDK_INT < Build.VERSION_CODES.UPSIDE_DOWN_CAKE) {
-                        @Suppress("DEPRECATION")
-                        overridePendingTransition(R.anim.slide_in_right, R.anim.slide_out_left)
-                    }
                 }
             )
         }

app/src/main/kotlin/plus/rua/project/BaseActivity.kt

@@ -0,0 +1,60 @@
+package plus.rua.project
+
+import android.os.Build
+import android.os.Bundle
+import androidx.activity.ComponentActivity
+import androidx.activity.enableEdgeToEdge
+import androidx.annotation.AnimRes
+
+/**
+ * 提供 edge-to-edge 和 slide 转场动画的 Activity 基类。
+ */
+abstract class BaseActivity : ComponentActivity() {
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        enableEdgeToEdge()
+        super.onCreate(savedInstanceState)
+
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.UPSIDE_DOWN_CAKE) {
+            overrideActivityTransition(
+                OVERRIDE_TRANSITION_OPEN,
+                R.anim.slide_in_right,
+                R.anim.slide_out_left
+            )
+            overrideActivityTransition(
+                OVERRIDE_TRANSITION_CLOSE,
+                R.anim.slide_in_left,
+                R.anim.slide_out_right
+            )
+        }
+    }
+
+    /**
+     * 带 slide 返回动画的 finish。
+     */
+    protected fun finishWithSlideBack(
+        @AnimRes enterAnim: Int = R.anim.slide_in_left,
+        @AnimRes exitAnim: Int = R.anim.slide_out_right
+    ) {
+        finish()
+        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.UPSIDE_DOWN_CAKE) {
+            @Suppress("DEPRECATION")
+            overridePendingTransition(enterAnim, exitAnim)
+        }
+    }
+
+    /**
+     * 带 slide 进入动画的 startActivity。
+     */
+    protected fun startActivityWithSlide(
+        intent: android.content.Intent,
+        @AnimRes enterAnim: Int = R.anim.slide_in_right,
+        @AnimRes exitAnim: Int = R.anim.slide_out_left
+    ) {
+        startActivity(intent)
+        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.UPSIDE_DOWN_CAKE) {
+            @Suppress("DEPRECATION")
+            overridePendingTransition(enterAnim, exitAnim)
+        }
+    }
+}

app/src/main/kotlin/plus/rua/project/DateCheckerActivity.kt

@@ -1,39 +1,16 @@
 package plus.rua.project
 
-import android.os.Build
 import android.os.Bundle
-import androidx.activity.ComponentActivity
 import androidx.activity.compose.setContent
-import androidx.activity.enableEdgeToEdge
 import plus.rua.project.ui.DateCheckerScreen
 
-class DateCheckerActivity : ComponentActivity() {
+class DateCheckerActivity : BaseActivity() {
     override fun onCreate(savedInstanceState: Bundle?) {
-        enableEdgeToEdge()
         super.onCreate(savedInstanceState)
 
-        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.UPSIDE_DOWN_CAKE) {
-            overrideActivityTransition(
-                OVERRIDE_TRANSITION_OPEN,
-                R.anim.slide_in_right,
-                R.anim.slide_out_left
-            )
-            overrideActivityTransition(
-                OVERRIDE_TRANSITION_CLOSE,
-                R.anim.slide_in_left,
-                R.anim.slide_out_right
-            )
-        }
-
         setContent {
             DateCheckerScreen(
-                onBack = {
+                onBack = { finishWithSlideBack() }
-                    finish()
-                    if (Build.VERSION.SDK_INT < Build.VERSION_CODES.UPSIDE_DOWN_CAKE) {
-                        @Suppress("DEPRECATION")
-                        overridePendingTransition(R.anim.slide_in_left, R.anim.slide_out_right)
-                    }
-                }
             )
         }
     }

app/src/main/kotlin/plus/rua/project/LicensesActivity.kt

@@ -1,39 +1,16 @@
 package plus.rua.project
 
-import android.os.Build
 import android.os.Bundle
-import androidx.activity.ComponentActivity
 import androidx.activity.compose.setContent
-import androidx.activity.enableEdgeToEdge
 import plus.rua.project.ui.LicensesScreen
 
-class LicensesActivity : ComponentActivity() {
+class LicensesActivity : BaseActivity() {
     override fun onCreate(savedInstanceState: Bundle?) {
-        enableEdgeToEdge()
         super.onCreate(savedInstanceState)
 
-        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.UPSIDE_DOWN_CAKE) {
-            overrideActivityTransition(
-                OVERRIDE_TRANSITION_OPEN,
-                R.anim.slide_in_right,
-                R.anim.slide_out_left
-            )
-            overrideActivityTransition(
-                OVERRIDE_TRANSITION_CLOSE,
-                R.anim.slide_in_left,
-                R.anim.slide_out_right
-            )
-        }
-
         setContent {
             LicensesScreen(
-                onBack = {
+                onBack = { finishWithSlideBack() }
-                    finish()
-                    if (Build.VERSION.SDK_INT < Build.VERSION_CODES.UPSIDE_DOWN_CAKE) {
-                        @Suppress("DEPRECATION")
-                        overridePendingTransition(R.anim.slide_in_left, R.anim.slide_out_right)
-                    }
-                }
             )
         }
     }

app/src/main/kotlin/plus/rua/project/MainActivity.kt

@@ -1,34 +1,21 @@
 package plus.rua.project
 
 import android.content.Intent
-import android.os.Build
 import android.os.Bundle
-import androidx.activity.ComponentActivity
 import androidx.activity.compose.setContent
-import androidx.activity.enableEdgeToEdge
-import androidx.compose.runtime.Composable
 import plus.rua.project.ui.CalendarMonthView
 
-class MainActivity : ComponentActivity() {
+class MainActivity : BaseActivity() {
     override fun onCreate(savedInstanceState: Bundle?) {
-        enableEdgeToEdge()
         super.onCreate(savedInstanceState)
 
         setContent {
             CalendarMonthView(
                 onNavigateToAbout = {
-                    startActivity(Intent(this, AboutActivity::class.java))
+                    startActivityWithSlide(Intent(this, AboutActivity::class.java))
-                    if (Build.VERSION.SDK_INT < Build.VERSION_CODES.UPSIDE_DOWN_CAKE) {
-                        @Suppress("DEPRECATION")
-                        overridePendingTransition(R.anim.slide_in_right, R.anim.slide_out_left)
-                    }
                 },
                 onNavigateToTools = {
-                    startActivity(Intent(this, ToolsActivity::class.java))
+                    startActivityWithSlide(Intent(this, ToolsActivity::class.java))
-                    if (Build.VERSION.SDK_INT < Build.VERSION_CODES.UPSIDE_DOWN_CAKE) {
-                        @Suppress("DEPRECATION")
-                        overridePendingTransition(R.anim.slide_in_right, R.anim.slide_out_left)
-                    }
                 }
             )
         }

app/src/main/kotlin/plus/rua/project/ToolsActivity.kt

@@ -1,46 +1,19 @@
 package plus.rua.project
 
 import android.content.Intent
-import android.os.Build
 import android.os.Bundle
-import androidx.activity.ComponentActivity
 import androidx.activity.compose.setContent
-import androidx.activity.enableEdgeToEdge
 import plus.rua.project.ui.ToolsScreen
 
-class ToolsActivity : ComponentActivity() {
+class ToolsActivity : BaseActivity() {
     override fun onCreate(savedInstanceState: Bundle?) {
-        enableEdgeToEdge()
         super.onCreate(savedInstanceState)
 
-        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.UPSIDE_DOWN_CAKE) {
-            overrideActivityTransition(
-                OVERRIDE_TRANSITION_OPEN,
-                R.anim.slide_in_right,
-                R.anim.slide_out_left
-            )
-            overrideActivityTransition(
-                OVERRIDE_TRANSITION_CLOSE,
-                R.anim.slide_in_left,
-                R.anim.slide_out_right
-            )
-        }
-
         setContent {
             ToolsScreen(
-                onBack = {
+                onBack = { finishWithSlideBack() },
-                    finish()
-                    if (Build.VERSION.SDK_INT < Build.VERSION_CODES.UPSIDE_DOWN_CAKE) {
-                        @Suppress("DEPRECATION")
-                        overridePendingTransition(R.anim.slide_in_left, R.anim.slide_out_right)
-                    }
-                },
                 onNavigateToDateChecker = {
-                    startActivity(Intent(this, DateCheckerActivity::class.java))
+                    startActivityWithSlide(Intent(this, DateCheckerActivity::class.java))
-                    if (Build.VERSION.SDK_INT < Build.VERSION_CODES.UPSIDE_DOWN_CAKE) {
-                        @Suppress("DEPRECATION")
-                        overridePendingTransition(R.anim.slide_in_right, R.anim.slide_out_left)
-                    }
                 }
             )
         }

core/src/main/kotlin/plus/rua/project/ui/CalendarMonthView.kt

@@ -66,6 +66,7 @@ import androidx.compose.ui.input.pointer.pointerInput
 import androidx.compose.ui.layout.onSizeChanged
 import androidx.compose.ui.platform.LocalDensity
 import androidx.compose.ui.unit.dp
+import kotlinx.coroutines.delay
 import kotlinx.coroutines.launch
 import kotlinx.datetime.DatePeriod
 import kotlinx.datetime.LocalDate
@@ -568,19 +569,21 @@ private fun BottomCardArea(
         label = "bottomCardSlide"
     )
 
-    // P0-J: 延迟一帧显示 BottomCard，避免 AnimatedGif 和 lunar 计算阻塞首帧
+    // 延迟一帧显示 BottomCard，避免 AnimatedGif 和 lunar 计算阻塞首帧
-    var frameCount by remember { mutableIntStateOf(0) }
+    var hasLoaded by remember { mutableStateOf(false) }
-    androidx.compose.runtime.SideEffect { frameCount++ }
+    LaunchedEffect(Unit) {
-    val shouldShow = frameCount >= 2
+        delay(32)
+        hasLoaded = true
+    }
+    val shouldShow = hasLoaded
 
-    val selectedDate by viewModel.selectedDate.collectAsState()
+    val uiState by viewModel.uiState.collectAsState()
-    val isCollapsed by viewModel.isCollapsed.collectAsState()
+    val shiftKind = viewModel.shiftKindAt(uiState.selectedDate)
-    val shiftKind = viewModel.shiftKindAt(selectedDate)
 
     if (shouldShow) {
         BottomCard(
-            isCollapsed = isCollapsed,
+            isCollapsed = uiState.isCollapsed,
-            selectedDate = selectedDate,
+            selectedDate = uiState.selectedDate,
             today = today,
             shiftKind = shiftKind,
             onDrag = { delta -> viewModel.onDrag(delta) },