test: Fix cancel tests to match actual message spelling

Update tests to expect "cancelled" (British spelling) to match the
actual i18n message "Search cancelled." instead of "Canceled".

Author: claude

tests/e2e/command_palette.rs

@@ -109,7 +109,7 @@ fn test_command_palette_cancel() {
 
     // Prompt should be gone
     harness.assert_screen_not_contains("Command:");
-    harness.assert_screen_contains("Canceled");
+    harness.assert_screen_contains("cancelled");
 }
 
 /// Test executing a command from the palette

tests/e2e/file_browser.rs

@@ -320,7 +320,7 @@ fn test_file_browser_cancel() {
 
     // File browser should be closed
     harness.assert_screen_not_contains("Navigation:");
-    harness.assert_screen_contains("Canceled");
+    harness.assert_screen_contains("cancelled");
 }
 
 /// Test that column headers are shown (Name, Size, Modified)

tests/e2e/open_folder.rs

@@ -310,7 +310,7 @@ fn test_switch_project_cancel_preserves_directory() {
 
     // Folder browser should be closed
     harness.assert_screen_not_contains("Navigation:");
-    harness.assert_screen_contains("Canceled");
+    harness.assert_screen_contains("cancelled");
 }
 
 /// Test that folder browser can navigate using backspace to go to parent

tests/e2e/prompt.rs

@@ -96,9 +96,9 @@ fn test_prompt_cancel() {
     harness.send_key(KeyCode::Esc, KeyModifiers::NONE).unwrap();
     harness.render().unwrap();
 
-    // Prompt should be gone, and "Canceled" message should appear
+    // Prompt should be gone, and "cancelled" message should appear
     harness.assert_screen_not_contains("Open:");
-    harness.assert_screen_contains("Canceled");
+    harness.assert_screen_contains("cancelled");
 }
 
 /// Test the complete open file workflow