Corrected the actionButton color of snackbar according the light/dark theme.

core/src/main/java/org/kiwix/kiwixmobile/core/extensions/SnackbarHostStateExtension.kt

@@ -18,6 +18,7 @@
 
 package org.kiwix.kiwixmobile.core.extensions
 
+import androidx.compose.foundation.isSystemInDarkTheme
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Snackbar
 import androidx.compose.material3.SnackbarDuration
@@ -27,21 +28,28 @@ import androidx.compose.material3.SnackbarResult
 import androidx.compose.runtime.Composable
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.launch
+import org.kiwix.kiwixmobile.core.ui.theme.DenimBlue400
 
 /**
- * A custom Snackbar host for displaying snackbars with a consistent style in the Kiwix app.
+ * A custom SnackbarHost for displaying snackbars with theme-aware action button colors.
  *
- * This Composable wraps the default [SnackbarHost] and applies a custom action text color
+ * This function ensures that the action button color follows the app's theme:
- * using the primary color from the Material theme.
+ * - In **light mode**, the action button color is `DenimBlue400`.
+ * - In **dark mode**, the action button color is `surface`, similar to the XML-based styling.
  *
- * @param snackbarHostState The state that controls the visibility and content of the Snackbar.
+ * @param snackbarHostState The state that controls the Snackbar display.
  */
 @Composable
 fun KiwixSnackbarHost(snackbarHostState: SnackbarHostState) {
+  val actionColor = if (isSystemInDarkTheme()) {
+    MaterialTheme.colorScheme.surface
+  } else {
+    DenimBlue400
+  }
   SnackbarHost(hostState = snackbarHostState) { snackbarData ->
     Snackbar(
       snackbarData = snackbarData,
-      actionColor = MaterialTheme.colorScheme.primary
+      actionColor = actionColor
     )
   }
 }
@@ -57,7 +65,7 @@ fun SnackbarHostState.snack(
   lifecycleScope.launch {
     val result = showSnackbar(
       message = message,
-      actionLabel = actionLabel,
+      actionLabel = actionLabel?.uppercase(),
       duration = snackbarDuration
     )
     if (result == SnackbarResult.ActionPerformed) {

core/src/main/java/org/kiwix/kiwixmobile/core/ui/components/KiwixAppBar.kt

@@ -25,9 +25,6 @@ import androidx.compose.foundation.layout.Spacer
 import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.height
 import androidx.compose.foundation.layout.padding
-import androidx.compose.material.icons.Icons
-import androidx.compose.material.icons.filled.Delete
-import androidx.compose.material.icons.filled.Share
 import androidx.compose.material3.Icon
 import androidx.compose.material3.IconButton
 import androidx.compose.material3.MaterialTheme
@@ -40,14 +37,9 @@ import androidx.compose.ui.graphics.vector.rememberVectorPainter
 import androidx.compose.ui.res.painterResource
 import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.text.font.FontWeight.Companion.SemiBold
-import androidx.compose.ui.tooling.preview.Preview
-import org.kiwix.kiwixmobile.core.R
 import org.kiwix.kiwixmobile.core.ui.models.ActionMenuItem
 import org.kiwix.kiwixmobile.core.ui.models.IconItem
-import org.kiwix.kiwixmobile.core.ui.models.IconItem.Drawable
-import org.kiwix.kiwixmobile.core.ui.models.IconItem.Vector
 import org.kiwix.kiwixmobile.core.ui.theme.Black
-import org.kiwix.kiwixmobile.core.ui.theme.KiwixTheme
 import org.kiwix.kiwixmobile.core.ui.theme.White
 import org.kiwix.kiwixmobile.core.utils.ComposeDimens.KIWIX_APP_BAR_HEIGHT
 import org.kiwix.kiwixmobile.core.utils.ComposeDimens.SIXTEEN_DP
@@ -112,39 +104,3 @@ private fun ActionMenu(actionMenuItems: List<ActionMenuItem>) {
     }
   }
 }
-
-@Preview(name = "NightMode", uiMode = android.content.res.Configuration.UI_MODE_NIGHT_YES)
-@Preview(name = "LightMode", uiMode = android.content.res.Configuration.UI_MODE_NIGHT_NO)
-@Composable
-fun PreviewKiwixAppBar() {
-  KiwixTheme {
-    KiwixAppBar(
-      R.string.note,
-      {
-        NavigationIcon(
-          iconItem = IconItem.Drawable(R.drawable.ic_close_white_24dp),
-          onClick = {}
-        )
-      },
-      listOf(
-        ActionMenuItem(
-          Vector(Icons.Default.Delete),
-          R.string.delete,
-          {},
-          isEnabled = false
-        ),
-        ActionMenuItem(
-          Vector(Icons.Default.Share),
-          R.string.share,
-          {},
-          isEnabled = true
-        ),
-        ActionMenuItem(
-          Drawable(R.drawable.ic_save),
-          R.string.save,
-          {}
-        )
-      ),
-    )
-  }
-}