refactor: clean up redundant calls and replace deprecated APIs

Unnecessary safe call on a non-null File receiver; unused catch parameters renamed to _; constructor parameter used only in init no longer held as a property; deprecated Configuration.screenHeightDp replaced with LocalWindowInfo.containerSize; redundant filterNotNull on Paging items; deprecated invisibleToUser() replaced with hideFromAccessibility(); redundant alias variable inlined; redundant else in an exhaustive when removed; paging snapshot read moved into the SideEffect that consumes it.

app/src/main/java/com/example/research/MainActivity.kt

@@ -181,7 +181,7 @@ class MainActivity : ComponentActivity() {
             runBlocking {
                 app.preferencesManager.hadNoDictionaries.first()
             }
-        } catch (e: Exception) {
+        } catch (_: Exception) {
             true
         }
     }

app/src/main/java/com/example/research/common/progress/DictionaryPipelineCoordinator.kt

@@ -62,7 +62,7 @@ class DictionaryPipelineCoordinator(
         pipelineJob?.cancel()
         pipelineJob = scope.launch(launchDispatcher) {
             val dir = File(dictionaryPath())
-            val filesBeforeReindex = dir?.listFiles()?.map { it.name }?.toSet() ?: emptySet()
+            val filesBeforeReindex = dir.listFiles()?.map { it.name }?.toSet() ?: emptySet()
             try {
                 triggerReindexing(isImport)
                 if (isImport) {
@@ -85,7 +85,7 @@ class DictionaryPipelineCoordinator(
                 }
                 cleanupOrphanedFiles(dir)
                 throw e
-            } catch (e: Exception) {
+            } catch (_: Exception) {
                 ui.showError()
             } finally {
                 finishService()

app/src/main/java/com/example/research/common/progress/DictionaryProgressPresenter.kt

@@ -7,7 +7,7 @@ import kotlinx.coroutines.flow.StateFlow
 import kotlinx.coroutines.launch
 
 class DictionaryProgressPresenter(
-    private val scope: CoroutineScope,
+    scope: CoroutineScope,
     private val progressSnapshot: StateFlow<DictionaryProgressModel.Snapshot?>,
     private val notifications: NotificationPort,
     mainDispatcher: CoroutineDispatcher = Dispatchers.Main,

app/src/main/java/com/example/research/ui/about/AboutScreen.kt

@@ -41,9 +41,10 @@ import androidx.compose.runtime.snapshotFlow
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.graphics.graphicsLayer
-import androidx.compose.ui.platform.LocalConfiguration
 import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.platform.LocalDensity
 import androidx.compose.ui.platform.LocalUriHandler
+import androidx.compose.ui.platform.LocalWindowInfo
 import androidx.compose.ui.platform.testTag
 import androidx.compose.ui.res.painterResource
 import androidx.compose.ui.res.stringResource
@@ -351,7 +352,9 @@ private fun LicenseDialog(
             this.alpha = alpha
         }
     ) {
-        val maxHeight = LocalConfiguration.current.screenHeightDp.dp - 96.dp
+        val maxHeight = with(LocalDensity.current) {
+            LocalWindowInfo.current.containerSize.height.toDp()
+        } - 96.dp
         Surface(
             shape = AlertDialogDefaults.shape,
             color = AlertDialogDefaults.containerColor,

app/src/main/java/com/example/research/ui/main/SearchResultsPane.kt

@@ -80,8 +80,8 @@ internal fun SearchResultsPane(
             }
     }
 
-    val loaded = results.itemSnapshotList.items.filterNotNull()
     SideEffect {
+        val loaded = results.itemSnapshotList.items
         if (results.loadState.refresh is LoadState.NotLoading && loaded.isNotEmpty()) {
             staleEntries = loaded
         }

app/src/main/java/com/example/research/ui/settings/SettingsViewModel.kt

@@ -242,7 +242,6 @@ class SettingsViewModel(
                             refreshDictionaryStatus()
                         }
                     }
-                    else -> {}
                 }
 
                 SettingsUiState(

app/src/main/java/com/example/research/ui/settings/components/DictionaryManagement.kt

@@ -33,7 +33,7 @@ import androidx.compose.ui.platform.LocalFocusManager
 import androidx.compose.ui.platform.LocalHapticFeedback
 import androidx.compose.ui.res.pluralStringResource
 import androidx.compose.ui.res.stringResource
-import androidx.compose.ui.semantics.invisibleToUser
+import androidx.compose.ui.semantics.hideFromAccessibility
 import androidx.compose.ui.semantics.semantics
 import androidx.compose.ui.unit.dp
 import androidx.lifecycle.compose.collectAsStateWithLifecycle
@@ -88,12 +88,11 @@ fun DictionaryManagement(
         derivedStateOf { importState is ImportState.Importing || importState is ImportState.Extracting }
     }
     val hasEnabledSources by remember(sources) { derivedStateOf { sources.any { it.isEnabled } } }
-    val isBlockingMutations = isInProgress
 
     // Invariant: the mutation-block flag is read only at state-read/gesture time (derivedStateOf,
     // snapshotFlow, pointerInput callbacks), never at row composition time. A composition-time read
     // (e.g. Modifier.alpha(if (isDeleteBlocked()) ...)) would invalidate every row on each flip.
-    val isMutationsBlockedState = rememberUpdatedState(isBlockingMutations)
+    val isMutationsBlockedState = rememberUpdatedState(isInProgress)
     val isDeleteBlocked = remember { { isMutationsBlockedState.value } }
 
     SectionCard(
@@ -149,13 +148,13 @@ fun DictionaryManagement(
 
                     // Disable accessibility on background content during import to improve performance.
                     // The progress dialog remains accessible for cancellation.
-                    val backgroundModifier = if (isBlockingMutations) {
-                        Modifier.semantics { invisibleToUser() }
+                    val backgroundModifier = if (isInProgress) {
+                        Modifier.semantics { hideFromAccessibility() }
                     } else {
                         Modifier
                     }
 
-                    if (dictionaries.isEmpty() && !isBlockingMutations) {
+                    if (dictionaries.isEmpty() && !isInProgress) {
                         Column(
                             modifier = backgroundModifier
                                 .fillMaxWidth()
@@ -177,7 +176,7 @@ fun DictionaryManagement(
                             )
                         }
                     } else {
-                        if (dictionaryStatus is DictionaryStatus.NeedsUpdate && !isBlockingMutations && hasEnabledSources) {
+                        if (dictionaryStatus is DictionaryStatus.NeedsUpdate && !isInProgress && hasEnabledSources) {
                             DictionaryUpdateCard(
                                 onStartDownload = onStartDownload,
                                 modifier = backgroundModifier
@@ -194,7 +193,7 @@ fun DictionaryManagement(
                             isDeleteBlocked = isDeleteBlocked
                         )
 
-                        if (!isBlockingMutations) {
+                        if (!isInProgress) {
                             DictionaryActionButtons(
                                 onAddSource = {
                                     haptic.performHapticFeedback(HapticFeedbackType.TextHandleMove)