ADFA-5442: Change the Addons Manager screen's title to match its entry point

The screen's TopAppBar read "Plugins & Templates" - the name of its
two tabs, not the feature the user actually navigated to. Since users
get here by tapping "Addons Manager" in Preferences (ADFA-5640), the
window title should say the same thing, right above those very tabs.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

Author: yaturner

resources/src/main/res/values/strings.xml

@@ -1408,7 +1408,7 @@
 	<string name="title_plugin_manager">Plugin Manager</string>
 
 	<!-- Combined Plugin/Template Manager screen (ADFA-4928) -->
-	<string name="title_manager">Plugins &amp; Templates</string>
+	<string name="title_manager">Addons Manager</string>
 	<string name="tab_plugins">Plugins</string>
 	<string name="tab_templates">Templates</string>
 	<string name="no_templates_found">No templates found</string>