fix(repo): decode quoted untracked paths with Unicode correctly

With `core.quotePath=false`, Git can emit raw UTF-8 characters alongside
C-style escapes in a quoted status path. `Repo.untracked_files` forced
that path through ASCII before unquoting it, raising `UnicodeEncodeError`
for a filename such as `café\x7f.txt`.

Reuse the existing `_unquote_path` byte decoder, as `Repo.ignored` already
does. The regression uses real Git output with both `core.quotePath`
settings and also checks the `Repo.is_dirty` caller.

Validation: the regression failed before the change. Related filename
tests passed (4 passed, 1 skipped, 2 subtests passed), and Ruff lint,
formatting, and `git diff --check` passed.

Author: BHARTIYAYASH

git/repo/base.py

@@ -1141,9 +1141,7 @@ def _get_untracked_files(self, *args: Any, **kwargs: Any) -> List[str]:
             filename = line[len(prefix) :].rstrip("\n")
             # Special characters are escaped
             if filename[0] == filename[-1] == '"':
-                filename = filename[1:-1]
-                # WHATEVER ... it's a mess, but works for me
-                filename = filename.encode("ascii").decode("unicode_escape").encode("latin1").decode(defenc)
+                filename = _unquote_path(filename[1:-1].encode(defenc)).decode(defenc)
             untracked_files.append(filename)
         finalize_process(proc)
         return untracked_files

test/test_repo.py

@@ -905,6 +905,18 @@ def test_untracked_files(self, rwrepo):
             self.assertEqual(len(rwrepo.untracked_files), (num_recently_untracked - len(files)))
         # END for each run
 
+    @with_rw_directory
+    def test_untracked_files_with_unquoted_unicode_and_escapes(self, rw_dir):
+        with Repo.init(rw_dir) as repo:
+            paths = {"plain.txt", "caf\u00e9.txt", "caf\u00e9\x7f.txt", " leading.txt"}
+            for path in paths:
+                Path(rw_dir, path).touch()
+            for quote_path in ("true", "false"):
+                with self.subTest(quote_path=quote_path):
+                    repo.git.config("core.quotePath", quote_path)
+                    assert set(repo.untracked_files) == paths
+                    assert repo.is_dirty(untracked_files=True)
+
     def test_config_reader(self):
         reader = self.rorepo.config_reader()  # All config files.
         assert reader.read_only