chore: eliminate all Kotlin compiler warnings in main source (#877)

* chore: eliminate all Kotlin compiler warnings in main source

* test(chat): fix cross-class coroutine leaks poisoning the unit suite

- ChatUpdateCommandTest: inject FakeSlashUsageStore — the real DataStore
  store inits on real IO threads with a relaxed-mock app (cacheDir NPE)
  and leaks an uncaught exception into the next runTest class.
- ChatUpdateCommandTest + SlashCommandDispatchRpcTest: mock
  ProfileSwitchCoordinator.switched (ChatViewModelTest pattern) — VMs
  otherwise park collectors on the singleton flow that crash later
  classes (ProfileSwitchCoordinatorTest) on stale-Main resumption.

Full suite: 944 tests, 0 failures (was 2 flaky per run).

---------

Co-authored-by: M57 <hy4ri@users.noreply.github.com>

app/src/main/java/com/m57/hermescontrol/ui/keys/KeysScreen.kt

@@ -5,6 +5,7 @@
 
 package com.m57.hermescontrol.ui.keys
 
+import android.content.ClipData
 import androidx.compose.animation.animateContentSize
 import androidx.compose.foundation.BorderStroke
 import androidx.compose.foundation.clickable
@@ -29,6 +30,7 @@ import androidx.compose.foundation.rememberScrollState
 import androidx.compose.foundation.shape.RoundedCornerShape
 import androidx.compose.foundation.text.KeyboardOptions
 import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.automirrored.outlined.OpenInNew
 import androidx.compose.material.icons.filled.Add
 import androidx.compose.material.icons.filled.Clear
 import androidx.compose.material.icons.filled.Delete
@@ -41,7 +43,6 @@ import androidx.compose.material.icons.outlined.Build
 import androidx.compose.material.icons.outlined.ContentCopy
 import androidx.compose.material.icons.outlined.Folder
 import androidx.compose.material.icons.outlined.Forum
-import androidx.compose.material.icons.outlined.OpenInNew
 import androidx.compose.material.icons.outlined.SmartToy
 import androidx.compose.material.icons.outlined.Tune
 import androidx.compose.material3.AlertDialog
@@ -66,11 +67,13 @@ import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
+import androidx.compose.runtime.rememberCoroutineScope
 import androidx.compose.runtime.setValue
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.graphics.vector.ImageVector
-import androidx.compose.ui.platform.LocalClipboardManager
+import androidx.compose.ui.platform.ClipEntry
+import androidx.compose.ui.platform.LocalClipboard
 import androidx.compose.ui.platform.LocalUriHandler
 import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.text.AnnotatedString
@@ -97,6 +100,7 @@ import com.m57.hermescontrol.ui.common.SkeletonListState
 import com.m57.hermescontrol.ui.common.StatusBadge
 import com.m57.hermescontrol.ui.common.StatusBadgeType
 import com.m57.hermescontrol.ui.common.ToastEffect
+import kotlinx.coroutines.launch
 
 private const val FILTER_ALL = "ALL"
 
@@ -527,8 +531,9 @@ private fun EnvVarCard(
     val isRevealed = revealedValue != null
     var editedValue by remember(config, revealedValue) { mutableStateOf(revealedValue ?: "") }
 
-    val clipboardManager = LocalClipboardManager.current
+    val clipboard = LocalClipboard.current
     val uriHandler = LocalUriHandler.current
+    val scope = rememberCoroutineScope()
 
     val displayValue =
         if (isRevealed) {
@@ -645,7 +650,7 @@ private fun EnvVarCard(
                             }.padding(vertical = 2.dp),
                 ) {
                     Icon(
-                        imageVector = Icons.Outlined.OpenInNew,
+                        imageVector = Icons.AutoMirrored.Outlined.OpenInNew,
                         contentDescription = stringResource(R.string.keys_action_open_url),
                         tint = MaterialTheme.colorScheme.primary,
                         modifier = Modifier.size(14.dp),
@@ -759,7 +764,10 @@ private fun EnvVarCard(
                                 }
                                 if (isRevealed && !revealedValue.isNullOrEmpty()) {
                                     IconButton(onClick = {
-                                        clipboardManager.setText(AnnotatedString(revealedValue))
+                                        val text = AnnotatedString(revealedValue)
+                                        scope.launch {
+                                            clipboard.setClipEntry(ClipEntry(ClipData.newPlainText(null, text)))
+                                        }
                                         onShowToast(copiedMessage)
                                     }) {
                                         Icon(