fix(masking): Remove from opposite set when adding mask/unmask view class

addMaskViewClass now removes from unmaskViewClasses and vice versa,
preventing stale entries from silently blocking masking when
setMaskAllText(false)/setMaskAllImages(false) is called with defaults.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: romtsn

sentry/src/main/java/io/sentry/SentryMaskingOptions.java

@@ -93,6 +93,7 @@ public Set<String> getMaskViewClasses() {
 
   public void addMaskViewClass(final @NotNull String className) {
     this.maskViewClasses.add(className);
+    this.unmaskViewClasses.remove(className);
   }
 
   @NotNull
@@ -102,6 +103,7 @@ public Set<String> getUnmaskViewClasses() {
 
   public void addUnmaskViewClass(final @NotNull String className) {
     this.unmaskViewClasses.add(className);
+    this.maskViewClasses.remove(className);
   }
 
   public @Nullable String getMaskViewContainerClass() {

sentry/src/main/java/io/sentry/SentryReplayOptions.java

@@ -263,12 +263,14 @@ public void setMaskAllImages(final boolean maskAllImages) {
   public void addMaskViewClass(final @NotNull String className) {
     trackCustomMasking();
     this.maskViewClasses.add(className);
+    this.unmaskViewClasses.remove(className);
   }
 
   @Override
   public void addUnmaskViewClass(final @NotNull String className) {
     trackCustomMasking();
     this.unmaskViewClasses.add(className);
+    this.maskViewClasses.remove(className);
   }
 
   @ApiStatus.Internal