feat: language fragment to jetpack compose

- added orders to the test rule to avoid retries error in tests.
- renamed content lambda to "navigationIcon".
- removed redundant "Experimental api" from kiwixSearchView.
- added appropriate text size for kiwixSearchView.

app/src/androidTest/java/org/kiwix/kiwixmobile/language/LanguageFragmentTest.kt

@@ -37,6 +37,8 @@ import org.junit.Test
 import org.junit.runner.RunWith
 import org.kiwix.kiwixmobile.core.utils.LanguageUtils.Companion.handleLocaleChange
 import org.kiwix.kiwixmobile.core.utils.SharedPreferenceUtil
+import org.kiwix.kiwixmobile.core.utils.TestingUtils.COMPOSE_TEST_RULE_ORDER
+import org.kiwix.kiwixmobile.core.utils.TestingUtils.RETRY_RULE_ORDER
 import org.kiwix.kiwixmobile.main.KiwixMainActivity
 import org.kiwix.kiwixmobile.testutils.RetryRule
 import org.kiwix.kiwixmobile.testutils.TestUtils.closeSystemDialogs
@@ -46,10 +48,11 @@ import org.kiwix.kiwixmobile.utils.StandardActions
 @LargeTest
 @RunWith(AndroidJUnit4::class)
 class LanguageFragmentTest {
-  @get:Rule
+  @Rule(order = RETRY_RULE_ORDER)
-  val retryTestRule = RetryRule()
+  @JvmField
+  val retryRule = RetryRule()
 
-  @get:Rule
+  @get:Rule(order = COMPOSE_TEST_RULE_ORDER)
   val composeTestRule = createComposeRule()
 
   private val permissions =

app/src/main/java/org/kiwix/kiwixmobile/language/LanguageFragment.kt

@@ -91,7 +91,7 @@ class LanguageFragment : BaseFragment() {
             searchText = it
             languageViewModel.actions.offer(Action.Filter(it))
           },
-          content = {
+          navigationIcon = {
             NavigationIcon(
               iconItem = if (isSearchActive) {
                 IconItem.Vector(Icons.AutoMirrored.Filled.ArrowBack)

app/src/main/java/org/kiwix/kiwixmobile/language/LanguageScreen.kt

@@ -18,6 +18,7 @@
 
 package org.kiwix.kiwixmobile.language
 
+import android.annotation.SuppressLint
 import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.calculateEndPadding
@@ -46,6 +47,7 @@ import org.kiwix.kiwixmobile.language.viewmodel.LanguageViewModel
 import org.kiwix.kiwixmobile.language.viewmodel.State
 import org.kiwix.kiwixmobile.language.viewmodel.State.Content
 
+@SuppressLint("ComposableLambdaParameterNaming")
 @Composable
 fun LanguageScreen(
   searchText: String,
@@ -54,7 +56,7 @@ fun LanguageScreen(
   actionMenuItemList: List<ActionMenuItem>,
   onClearClick: () -> Unit,
   onAppBarValueChange: (String) -> Unit,
-  content: @Composable() () -> Unit,
+  navigationIcon: @Composable() () -> Unit = {}
 ) {
   val state by languageViewModel.state.observeAsState(State.Loading)
   val listState: LazyListState = rememberLazyListState()
@@ -63,7 +65,7 @@ fun LanguageScreen(
   Scaffold(topBar = {
     KiwixAppBar(
       titleId = R.string.select_languages,
-      navigationIcon = content,
+      navigationIcon = navigationIcon,
       actionMenuItems = actionMenuItemList,
       searchBar = if (isSearchActive) {
         { modifier ->

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

@@ -18,9 +18,9 @@
 
 package org.kiwix.kiwixmobile.core.ui.components
 
-import androidx.compose.material3.ExperimentalMaterial3Api
 import androidx.compose.material3.Icon
 import androidx.compose.material3.IconButton
+import androidx.compose.material3.Text
 import androidx.compose.material3.TextField
 import androidx.compose.material3.TextFieldDefaults
 import androidx.compose.runtime.Composable
@@ -31,9 +31,11 @@ import androidx.compose.ui.focus.focusRequester
 import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.platform.testTag
 import androidx.compose.ui.res.painterResource
+import androidx.compose.ui.res.stringResource
+import androidx.compose.ui.text.TextStyle
 import org.kiwix.kiwixmobile.core.R
+import org.kiwix.kiwixmobile.core.utils.ComposeDimens
 
-@OptIn(ExperimentalMaterial3Api::class)
 @Composable
 fun KiwixSearchView(
   modifier: Modifier,
@@ -59,7 +61,17 @@ fun KiwixSearchView(
       .focusRequester(focusRequester),
     singleLine = true,
     value = value,
+    placeholder = {
+      Text(
+        text = stringResource(R.string.search_label),
+        color = Color.LightGray,
+        fontSize = ComposeDimens.EIGHTEEN_SP
+      )
+    },
     colors = colors,
+    textStyle = TextStyle.Default.copy(
+      fontSize = ComposeDimens.EIGHTEEN_SP
+    ),
     onValueChange = {
       onValueChange(it.replace("\n", ""))
     },

core/src/main/java/org/kiwix/kiwixmobile/core/utils/ComposeDimens.kt

@@ -56,6 +56,7 @@ object ComposeDimens {
   // Font Sizes
   val TWENTY_FOUR_SP = 24.sp
   val FOURTEEN_SP = 14.sp
+  val EIGHTEEN_SP = 18.sp
 
   // Default letter spacing in text according to theme
   val DEFAULT_LETTER_SPACING = 0.0333.em