Enforce Android lifecycle and presentation security (#100)

crates/storage/tests/presentation.rs

@@ -165,6 +165,28 @@ fn clearing_clipboard_never_reads_or_restores_previous_secrets() -> TestResult {
     Ok(())
 }
 
+#[test]
+fn immediate_copy_revocation_clears_only_matching_content() -> TestResult {
+    let backend = MemoryClipboard::with_text(b"copied secret");
+    let mut manager = ClipboardManager::new(backend.clone(), ClipboardTimeout::default());
+    let secret = SecretBytes::new(b"copied secret".to_vec());
+    assert_eq!(
+        manager.clear_current_copy(&secret)?,
+        ClipboardDisposition::Cleared
+    );
+    assert_eq!(backend.text(), None);
+    backend.set_text(b"new user value");
+    assert_eq!(
+        manager.clear_current_copy(&secret)?,
+        ClipboardDisposition::PreservedNewer
+    );
+    assert_eq!(
+        backend.text().as_deref(),
+        Some(b"new user value".as_slice())
+    );
+    Ok(())
+}
+
 #[test]
 fn clipboard_validation_and_cleanup_failures_are_typed_and_redacted() -> TestResult {
     assert_eq!(