fix: address second round of Copilot review feedback

- Fix docstring to say Bearer instead of token (matches implementation)
- Remove unused imports/fixtures from redirect tests (GITHUB_HOSTS,
  MagicMock, temp_dir, monkeypatch)
- Replace __import__('io').BytesIO() with normal import io pattern
  in test_presets.py

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: userhas404d

src/specify_cli/_github_http.py

@@ -27,7 +27,7 @@ def build_github_request(url: str) -> urllib.request.Request:
     """Build a urllib Request, adding a GitHub auth header when available.
 
     Reads GITHUB_TOKEN or GH_TOKEN from the environment and attaches an
-    ``Authorization: token <value>`` header when the target hostname is one
+    ``Authorization: Bearer <value>`` header when the target hostname is one
     of the known GitHub-owned domains. Non-GitHub URLs are returned as plain
     requests so credentials are never leaked to third-party hosts.
     """

tests/test_extensions.py

@@ -2514,11 +2514,10 @@ def test_make_request_token_added_for_codeload_github_com(self, temp_dir, monkey
         req = catalog._make_request("https://codeload.github.com/org/repo/zip/refs/tags/v1.0.0")
         assert req.get_header("Authorization") == "Bearer ghp_testtoken"
 
-    def test_redirect_preserves_auth_for_github_to_codeload(self, temp_dir, monkeypatch):
+    def test_redirect_preserves_auth_for_github_to_codeload(self):
         """Auth header is preserved when GitHub redirects to codeload.github.com."""
-        from specify_cli._github_http import _StripAuthOnRedirect, GITHUB_HOSTS
+        from specify_cli._github_http import _StripAuthOnRedirect
         from urllib.request import Request
-        from unittest.mock import MagicMock
         import io
 
         handler = _StripAuthOnRedirect()
@@ -2531,7 +2530,7 @@ def test_redirect_preserves_auth_for_github_to_codeload(self, temp_dir, monkeypa
         auth = new_req.get_header("Authorization") or new_req.unredirected_hdrs.get("Authorization")
         assert auth == "Bearer ghp_test"
 
-    def test_redirect_strips_auth_for_github_to_external(self, temp_dir, monkeypatch):
+    def test_redirect_strips_auth_for_github_to_external(self):
         """Auth header is stripped when GitHub redirects to a non-GitHub host."""
         from specify_cli._github_http import _StripAuthOnRedirect
         from urllib.request import Request

tests/test_presets.py

@@ -1489,7 +1489,8 @@ def test_download_pack_sends_auth_header(self, project_dir, monkeypatch):
         monkeypatch.setenv("GITHUB_TOKEN", "ghp_testtoken")
         catalog = PresetCatalog(project_dir)
 
-        zip_buf = __import__("io").BytesIO()
+        import io
+        zip_buf = io.BytesIO()
         with zipfile.ZipFile(zip_buf, "w") as zf:
             zf.writestr("preset.yml", "id: test-pack\nname: Test\nversion: 1.0.0\n")
         zip_bytes = zip_buf.getvalue()