feat(aap): Add new device settings, stem actions, and noise control UI

Add 8 new AAP writable settings (microphone mode, ear detection toggle, listening mode cycle, allow off, stem config, sleep detection, in-case tone, device rename) and 4 new data reception features (stem press events, connected devices, audio source, EQ data).

Implement stem press action system with per-bud configurable Android actions (play/pause, next/prev track, volume), auto-sent stem config on connection, and dedicated config screen.

Combine ANC mode selector with listening mode cycle visibility into a unified noise control component. Eye icons control which modes appear in the dashboard card and settings. Pro gating with stars icon for upgrade-required features.

Add 64 unit tests covering all new decoders, model feature flags, malformed payloads, and rename byte-length validation.

app/src/foss/java/eu/darken/capod/upgrade/ui/UpgradeScreen.kt

@@ -5,14 +5,11 @@ import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.Row
 import androidx.compose.foundation.layout.Spacer
-import androidx.compose.foundation.layout.WindowInsets
 import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.height
 import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.layout.size
-import androidx.compose.foundation.layout.systemBars
 import androidx.compose.foundation.layout.width
-import androidx.compose.foundation.layout.windowInsetsPadding
 import androidx.compose.foundation.rememberScrollState
 import androidx.compose.foundation.shape.CircleShape
 import androidx.compose.foundation.shape.RoundedCornerShape
@@ -36,6 +33,7 @@ import androidx.compose.material3.SnackbarHost
 import androidx.compose.material3.SnackbarHostState
 import androidx.compose.material3.Surface
 import androidx.compose.material3.Text
+import androidx.compose.material3.TopAppBar
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.DisposableEffect
 import androidx.compose.runtime.LaunchedEffect
@@ -117,18 +115,27 @@ fun UpgradeScreen(
     Scaffold(
         snackbarHost = { SnackbarHost(snackbarHostState) },
         containerColor = MaterialTheme.colorScheme.surface,
+        topBar = {
+            TopAppBar(
+                title = {},
+                navigationIcon = {
+                    IconButton(onClick = onNavigateUp) {
+                        Icon(
+                            imageVector = Icons.AutoMirrored.TwoTone.ArrowBack,
+                            contentDescription = null,
+                        )
+                    }
+                },
+            )
+        },
     ) { paddingValues ->
-    Box(modifier = Modifier
-        .windowInsetsPadding(WindowInsets.systemBars)
-        .padding(paddingValues)
-    ) {
         Column(
             modifier = Modifier
                 .verticalScroll(rememberScrollState())
+                .padding(paddingValues)
                 .padding(horizontal = 24.dp),
             horizontalAlignment = Alignment.CenterHorizontally,
         ) {
-            Spacer(modifier = Modifier.height(16.dp))
 
             Box(contentAlignment = Alignment.Center) {
                 Surface(
@@ -238,18 +245,6 @@ fun UpgradeScreen(
 
             Spacer(modifier = Modifier.height(24.dp))
         }
-
-        IconButton(
-            onClick = onNavigateUp,
-            modifier = Modifier.padding(4.dp),
-        ) {
-            Icon(
-                imageVector = Icons.AutoMirrored.TwoTone.ArrowBack,
-                contentDescription = null,
-                tint = MaterialTheme.colorScheme.onSurface,
-            )
-        }
-    }
     }
 }