lint: ruff format + one auto-fix so the push self-test is green again

`scripts/lint.sh --fix` from the pinned lint devshell: 90 Python files
reformatted (ruff format, mechanical) and one C420 (dict comprehension →
dict.fromkeys) in tests/unit/test_f211_sso_skip.py. The push self-test had
been failing at the lint stage since build 1313 (2026-08-31) on exactly
these files; nothing else changed.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01FqkQq3CDmFWcQ7u1LzoyRz

tests/cryptpad/custom/test_pad_content_roundtrip.py

@@ -150,9 +150,9 @@ def test_cryptpad_pad_content_survives_fresh_session(live_app):
             # --- session 1: create the pad + write the marker ---
             ctx1 = browser.new_context(ignore_https_errors=True)
             page, pad_url = _open_pad(ctx1, f"https://{live_app}/pad/")
-            assert (
-                "#/2/pad/edit/" in pad_url
-            ), f"CryptPad did not create a fragment-keyed pad URL; got {pad_url!r}"
+            assert "#/2/pad/edit/" in pad_url, (
+                f"CryptPad did not create a fragment-keyed pad URL; got {pad_url!r}"
+            )
             ck = _ckeditor_frame(page, reload_url=pad_url)
             assert ck is not None, "CKEditor content frame never attached (pad editor not ready)"
             _dismiss_store_modal(page)
@@ -161,9 +161,9 @@ def test_cryptpad_pad_content_survives_fresh_session(live_app):
             page.wait_for_timeout(1000)
             body.type(marker, delay=40)
             page.wait_for_timeout(12000)  # let CryptPad encrypt + sync the update to the server
-            assert (
-                marker in ck.locator("body").inner_text()
-            ), "marker not present in the editor after typing — type did not land"
+            assert marker in ck.locator("body").inner_text(), (
+                "marker not present in the editor after typing — type did not land"
+            )
             ctx1.close()
 
             # --- session 2: FRESH context (no shared storage/localStorage) reads the pad back by URL.