Minor UI fixes

- Remove M3 styling from search toolbar
- Use secondary alpha for subtitles for Sources and Migrate items
- Update some content descriptions

app/build.gradle.kts

@@ -315,6 +315,7 @@ tasks {
         kotlinOptions.freeCompilerArgs += listOf(
             "-opt-in=coil.annotation.ExperimentalCoilApi",
             "-opt-in=com.google.accompanist.pager.ExperimentalPagerApi",
+            "-opt-in=androidx.compose.material.ExperimentalMaterialApi",
             "-opt-in=androidx.compose.material3.ExperimentalMaterial3Api",
             "-opt-in=androidx.compose.ui.ExperimentalComposeUiApi",
             "-opt-in=androidx.compose.foundation.ExperimentalFoundationApi",
@@ -327,8 +328,6 @@ tasks {
         )
     }
 
-
-
     preBuild {
         val ktlintTask = if (System.getenv("GITHUB_BASE_REF") == null) formatKotlin else lintKotlin
         dependsOn(ktlintTask)