ui: slim the More menu and drop dead controls from the CW page

用户反馈三处 UI 问题, 一并处理。

1. 更多菜单风格不符 + 遮盖感重
   - 去掉全屏 scrim 遮罩(0.35 alpha 压暗整页), 改为透明点击层, 点外部仍可关闭
   - Card 限宽 232dp 靠右下角, 从"全宽卡片"变成竖长条
   - 容器色 surfaceContainerHigh -> surfaceContainer, 与导航栏一致; 加 1dp 细边框
   - 动画从全屏 expandVertically + spring 弹跳改为右下角原点 150ms scaleIn
   - Card 加 clickable(enabled=false) 吞掉点击, 避免点卡片空白区误触关闭

2. CW 页左上角退出键点击无效 -> 删除
   根因: CwDecodeScreen(navigateUp: () -> Unit = {}) 是默认空实现, 而
   MainScreen 的 entry<Screen.CwDecode> 调用 CwDecodeScreen() 从未传入
   navigateUp, 所以点击必然无反应。按 AGENTS.md 无死代码原则删除按钮 +
   navigateUp 参数 + cw_back 字符串(五语)。

3. CW 页"正在监听"状态行在停止解码后仍显示 -> 删除
   estimatedPitch 在暂停后保留上次值, 状态行不会消失, 属误导。删除该 Text
   后 estimatedPitch / lastInferenceMs 两个 collector 成为死代码, 一并清理;
   cw_status_listening / cw_status_tone 字符串(五语)同步删除。
   signalStrength(瀑布图) 与 errorMessage(错误提示) 仍在用, 保留。

验证:
- :app:compileDebugKotlin + :feature:cw:compileDebugKotlin => BUILD SUCCESSFUL
- :core:domain:test => 31 个 CW 测试全绿 (7+13+3+8)

app/src/main/java/com/rtbishop/look4sat/MainScreen.kt

@@ -22,18 +22,14 @@ import androidx.compose.animation.AnimatedVisibility
 import androidx.compose.animation.animateContentSize
 import androidx.compose.animation.core.LinearEasing
 import androidx.compose.animation.core.RepeatMode
-import androidx.compose.animation.core.Spring
 import androidx.compose.animation.core.animateFloat
 import androidx.compose.animation.core.infiniteRepeatable
 import androidx.compose.animation.core.rememberInfiniteTransition
-import androidx.compose.animation.core.spring
 import androidx.compose.animation.core.tween
-import androidx.compose.animation.expandVertically
 import androidx.compose.animation.fadeIn
 import androidx.compose.animation.fadeOut
 import androidx.compose.animation.scaleIn
 import androidx.compose.animation.scaleOut
-import androidx.compose.animation.shrinkVertically
 import androidx.compose.animation.slideInHorizontally
 import androidx.compose.animation.slideOutHorizontally
 import androidx.compose.animation.togetherWith
@@ -67,6 +63,7 @@ import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.draw.clip
 import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.graphics.TransformOrigin
 import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.res.painterResource
 import androidx.compose.ui.res.stringResource
@@ -346,14 +343,18 @@ fun MainScreen(navigateToRadar: () -> Unit = {}) {
                         }
                     }
                 }
-                // More-menu popup panel (overlays content above the bottom bar; spring bounce)
+                // More-menu popup panel (slim strip anchored to the bottom-right corner)
                 AnimatedVisibility(
                     visible = moreExpanded,
                     modifier = Modifier.fillMaxSize(),
-                    enter = expandVertically(
-                        animationSpec = spring(dampingRatio = Spring.DampingRatioMediumBouncy)
-                    ) + fadeIn(),
-                    exit = shrinkVertically() + fadeOut()
+                    enter = scaleIn(
+                        animationSpec = tween(150),
+                        transformOrigin = TransformOrigin(1f, 1f)
+                    ) + fadeIn(animationSpec = tween(150)),
+                    exit = scaleOut(
+                        animationSpec = tween(120),
+                        transformOrigin = TransformOrigin(1f, 1f)
+                    ) + fadeOut(animationSpec = tween(120))
                 ) {
                     MoreMenuPopup(
                         items = moreNavItems,

app/src/main/java/com/rtbishop/look4sat/MoreMenuPopup.kt

@@ -1,13 +1,13 @@
 /*
  * MoreMenuPopup.kt - bottom-nav "More" second-level menu popup panel (4.5.1).
  *
- * Overlays the content area (above the bottom bar, right-aligned), vertical menu items (icon+text+arrow),
- * current page highlighted; tap the scrim to close, tap an item to navigate. Open/close animation is driven by the caller
- * (MainScreen's AnimatedVisibility + spring).
+ * A slim right-aligned strip above the bottom bar, vertical menu items (icon+text+arrow),
+ * current page highlighted; tap outside to close, tap an item to navigate. No dimming scrim, so the
+ * page stays readable. Open/close animation is driven by the caller (MainScreen's AnimatedVisibility).
  */
 package com.rtbishop.look4sat
 
-import androidx.compose.foundation.background
+import androidx.compose.foundation.BorderStroke
 import androidx.compose.foundation.clickable
 import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.Column
@@ -18,6 +18,7 @@ import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.layout.size
 import androidx.compose.foundation.layout.width
+import androidx.compose.foundation.layout.widthIn
 import androidx.compose.foundation.shape.RoundedCornerShape
 import androidx.compose.material3.Card
 import androidx.compose.material3.CardDefaults
@@ -45,16 +46,22 @@ fun MoreMenuPopup(
     Box(
         modifier = Modifier
             .fillMaxSize()
-            .background(MaterialTheme.colorScheme.scrim.copy(alpha = 0.35f))
+            // Transparent catcher: taps outside the card dismiss the menu without
+            // dimming the page behind it.
             .clickable(onClick = onDismiss)
     ) {
         Card(
             modifier = Modifier
                 .align(Alignment.BottomEnd)
-                .padding(12.dp),
+                .padding(12.dp)
+                .widthIn(max = 232.dp)
+                // Swallow taps on the card so they do not reach the dismiss
+                // catcher underneath.
+                .clickable(enabled = false) {},
             shape = RoundedCornerShape(12.dp),
+            border = BorderStroke(1.dp, MaterialTheme.colorScheme.outlineVariant.copy(alpha = 0.6f)),
             colors = CardDefaults.cardColors(
-                containerColor = MaterialTheme.colorScheme.surfaceContainerHigh
+                containerColor = MaterialTheme.colorScheme.surfaceContainer
             )
         ) {
             Column(modifier = Modifier.padding(vertical = 4.dp)) {