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_create.py

@@ -51,9 +51,9 @@ def test_cryptpad_spa_renders_with_no_console_errors(live_app):
             title = (page.title() or "").lower()
             body = page.content()
             blower = body.lower()
-            assert (
-                "cryptpad" in title or "cryptpad" in blower
-            ), f"CryptPad SPA does not carry brand. title={title!r}, body excerpt: {body[:200]!r}"
+            assert "cryptpad" in title or "cryptpad" in blower, (
+                f"CryptPad SPA does not carry brand. title={title!r}, body excerpt: {body[:200]!r}"
+            )
 
             # Canonical CryptPad asset references in the rendered DOM
             canonical = ("/customize/", "/components/", "main.js", "/api/broadcast")