fix: a refused standalone copy is named

A copy refused by a read-only emulator folder raised the error count with no failures entry: the summary named no file, gave the BIOS folder as the location and no advice. The failure now carries its path, and the summary names the emulator folder and what to do.

tests/test_install.py

@@ -2852,6 +2852,43 @@ class ACheckNamesWhatTheCollectionLacks(unittest.TestCase):
 
 
 
+class ARefusedStandaloneCopyIsNamed(unittest.TestCase):
+    """A standalone copy refused by a read-only emulator folder counted as
+    an error with no failures entry: the summary named no file, pointed at
+    the BIOS folder and gave no advice."""
+
+    def test_the_file_and_its_folder_reach_the_summary(self):
+        import contextlib  # noqa: PLC0415
+
+        if os.name == "nt" or os.geteuid() == 0:
+            self.skipTest("a read-only folder needs POSIX modes and a non-root user")
+        bios = Path(_tempdir(self))
+        (bios / "scph5501.bin").write_bytes(b"x")
+        target = Path(_tempdir(self)) / "pcsx2-bios"
+        target.mkdir()
+        target.chmod(0o500)
+        self.addCleanup(target.chmod, 0o700)
+        manifest = {"standalone_copies": [
+            {"file": "scph5501.bin", "emulator": "pcsx2",
+             "targets": {"linux": [str(target)]}},
+        ]}
+        failures: list = []
+        with contextlib.redirect_stdout(io.StringIO()):
+            _copied, _skipped, failed = install.do_standalone_copies(
+                manifest, bios, "linux", None, failures)
+        self.assertEqual(failed, 1)
+        self.assertEqual(failures, [(str(target / "scph5501.bin"), install.NOT_WRITABLE)])
+
+        out = io.StringIO()
+        with contextlib.redirect_stdout(out), self.assertRaises(SystemExit):
+            install._report_outcome([bios], 0, 1, failed, 0, False, failures=failures)
+        text = out.getvalue()
+        self.assertIn(str(target / "scph5501.bin"), text)
+        self.assertIn(str(target), text.split("Location")[1])
+        self.assertIn("cannot write there", text)
+
+
+
 class ThePagesQuoteTheBootstrapsOwnWords(unittest.TestCase):
     """The installer page and the FAQ quoted "install.py SHA-256 mismatch",
     a message the bootstraps no longer print."""