Remove legacy blue theme

Causing too many theming issues/complexity. This will make the Material 3 transition easier.

(cherry picked from commit f85dfa90b8)

app/src/main/java/eu/kanade/tachiyomi/data/preference/PreferenceValues.kt

@@ -31,7 +31,6 @@ object PreferenceValues {
         GREEN_APPLE(R.string.theme_greenapple),
         TEALTURQUOISE(R.string.theme_tealturquoise),
         YINYANG(R.string.theme_yinyang),
-        BLUE(R.string.theme_blue),
 
         // SY -->
         PURE_RED(R.string.theme_pure_red),
@@ -40,6 +39,7 @@ object PreferenceValues {
         // Deprecated
         DARK_BLUE(null),
         HOT_PINK(null),
+        BLUE(null),
     }
 
     enum class TappingInvertMode(val shouldInvertHorizontal: Boolean = false, val shouldInvertVertical: Boolean = false) {
@@ -65,7 +65,7 @@ object PreferenceValues {
     enum class ExtensionInstaller {
         LEGACY,
         PACKAGEINSTALLER,
-        SHIZUKU
+        SHIZUKU,
     }
 
     // SY -->

app/src/main/java/eu/kanade/tachiyomi/ui/base/activity/BaseThemedActivity.kt

@@ -34,10 +34,6 @@ abstract class BaseThemedActivity : AppCompatActivity() {
                 PreferenceValues.AppTheme.MONET -> {
                     resIds += R.style.Theme_Tachiyomi_Monet
                 }
-                PreferenceValues.AppTheme.BLUE -> {
-                    resIds += R.style.Theme_Tachiyomi_Blue
-                    resIds += R.style.ThemeOverlay_Tachiyomi_ColoredBars
-                }
                 PreferenceValues.AppTheme.GREEN_APPLE -> {
                     resIds += R.style.Theme_Tachiyomi_GreenApple
                 }

app/src/main/java/eu/kanade/tachiyomi/ui/main/MainActivity.kt

@@ -34,7 +34,6 @@ import dev.chrisbanes.insetter.applyInsetter
 import eu.kanade.tachiyomi.BuildConfig
 import eu.kanade.tachiyomi.R
 import eu.kanade.tachiyomi.data.notification.NotificationReceiver
-import eu.kanade.tachiyomi.data.preference.PreferenceValues
 import eu.kanade.tachiyomi.data.preference.asImmediateFlow
 import eu.kanade.tachiyomi.data.updater.AppUpdateChecker
 import eu.kanade.tachiyomi.data.updater.AppUpdateResult
@@ -622,8 +621,7 @@ class MainActivity : BaseViewBindingActivity<MainActivityBinding>() {
 
             binding.root.isLiftAppBarOnScroll = to !is NoAppBarElevationController
 
-            binding.appbar.isTransparentWhenNotLifted = to is MangaController &&
-                preferences.appTheme().get() != PreferenceValues.AppTheme.BLUE
+            binding.appbar.isTransparentWhenNotLifted = to is MangaController
             binding.controllerContainer.overlapHeader = to is MangaController
         }
     }