fix(android): detekt LongMethod on DiscoverScreen (63/60)

PullToRefreshScaffold addition in 4ca10e2 pushed the function 3
lines over. Extracted the inner Column body into a private
DiscoverBody helper composable.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

android/.idea/misc.xml

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
   <component name="ExternalStorageConfigurationManager" enabled="true" />
-  <component name="ProjectRootManager" version="2" languageLevel="JDK_21" project-jdk-name="jbr-21" project-jdk-type="JavaSDK">
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_21" default="true" project-jdk-name="jbr-21" project-jdk-type="JavaSDK">
     <output url="file://$PROJECT_DIR$/build/classes" />
   </component>
   <component name="ProjectType">