feat: hide toolbar in VshareWebActivity for fullscreen experience

Override attachToolbar() to return null, which tells BaseActivity
not to create a toolbar for this activity. This provides a true
fullscreen WebView experience without any app chrome.

Implementation follows the existing pattern used in TwoStepLoginActivity
and other fullscreen activities in the codebase.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: graycreate

app/src/main/java/me/ghui/v2er/module/vshare/VshareWebActivity.java

@@ -17,11 +17,14 @@
 import android.widget.ProgressBar;
 import android.widget.Toast;
 
+import androidx.annotation.Nullable;
+
 import butterknife.BindView;
 import me.ghui.v2er.R;
 import me.ghui.v2er.module.base.BaseActivity;
 import me.ghui.v2er.module.base.BaseContract;
 import me.ghui.v2er.util.DarkModelUtils;
+import me.ghui.v2er.widget.BaseToolBar;
 
 /**
  * Fullscreen WebView Activity for displaying vshare page
@@ -48,6 +51,13 @@ protected int attachLayoutRes() {
         return R.layout.activity_vshare_web;
     }
 
+    @Nullable
+    @Override
+    protected BaseToolBar attachToolbar() {
+        // Return null to hide the toolbar for fullscreen WebView experience
+        return null;
+    }
+
     @Override
     protected void reloadMode(int mode) {
         // Recreate activity to apply new theme