style: fix all ruff check, format, and mypy errors

[Copilot]

Resolve all ruff lint, formatting, and mypy type checking errors across the codebase.

• E501 line-too-long (protocol.py, screens.py): Rewrap long lines — split debug call args, extract format string to local, move inline comment above code
• UP035 + TC003 (tui/app.py): Import Awaitable from collections.abc and move into TYPE_CHECKING block
• TC002 (tui/auth_screen.py): Move ComposeResult into TYPE_CHECKING block (only used in annotations, from __future__ import annotations is active)
• I001 (tui/app.py): Fix import sort order as a side effect of the above
• ruff format: Applied ruff format . across all 19 files that were not conforming to the canonical formatter style (source and test files)
• mypy arg-type (b2c_login.py): Wrap url string with yarl.URL() for filter_cookies which expects a URL type
• mypy arg-type (heat_mode_screen.py, flame_speed_screen.py, fire_select_screen.py): Annotate Button variant variables with ButtonVariant type alias to satisfy the Literal expectation
• mypy union-attr (tui/app.py): Add None guard for sys.__stderr__ before accessing .fileno(), .buffer, and .flush()

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[deviantintegral]

@copilot fix the lint and test errors in the CI job.

[Copilot]

@copilot fix the lint and test errors in the CI job.

Fixed in 1fe8688. The ruff format --check . failure (19 files needing reformatting) is now resolved — ran ruff format . across the entire codebase. Both ruff check . and ruff format --check . pass, and all 989 tests pass.

Note: The "Conventional Commits" check fails because the PR title needs a conventional prefix (e.g. style: Fix all ruff check errors). That requires a PR title change which I can't do — you'll need to update it manually.

[deviantintegral]

@copilot can you fix the type checking errors in the lint job?

[Copilot]

@copilot can you fix the type checking errors in the lint job?

Fixed in cc654d4. All 7 mypy errors resolved:

• b2c_login.py — wrapped url with yarl.URL() for filter_cookies (updated test to match)
• heat_mode_screen.py, flame_speed_screen.py, fire_select_screen.py — annotated variant as ButtonVariant
• app.py — added None guard for sys.__stderr__

ruff check, ruff format --check, mypy src/, and all 989 tests pass.