Join the state-order error's two lines with a continuation

The message carried the source's indentation between "the" and "game";
the test now checks the block's id and the single spaces.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

crates/horizon-client/src/mod_content.rs

@@ -777,7 +777,8 @@ impl<'a> Plan<'a> {
                     && let Some(early) = decl.state_properties.keys().find(|k| k.as_str() < last)
                 {
                     return Err(format!(
-                        "{}: state property {early} sorts before {last}, a property of {}: the                          game orders states by property name, so name it after {last}",
+                        "{}: state property {early} sorts before {last}, a property of {}: the \
+                         game orders states by property name, so name it after {last}",
                         decl.id, decl.template
                     )
                     .into());

crates/horizon-client/src/mod_content_tests.rs

@@ -2681,10 +2681,10 @@ fn content_block_state_properties_are_validated() {
         Ok(_) => panic!("a property sorting before the template's was accepted"),
     };
     assert!(
-        error.contains("testmod:") || error.contains("alpha sorts before axis"),
+        error.contains("testmod:") && error.contains("alpha sorts before axis, a property of"),
         "{error}"
     );
-    assert!(error.contains("alpha sorts before axis"), "{error}");
+    assert!(!error.contains("  "), "one space between words: {error}");
     fs::remove_dir_all(&base).unwrap();
     fs::remove_dir_all(base.parent().unwrap().join("mod0")).ok();