Fix all flake8 errors in codebase

[Copilot]

Resolves all flake8 linting errors reported by flake8, flake8-import-order, and flake8-bugbear across the codebase.

Changes

Import ordering (I201, I202)

• Removed extraneous newlines between imports in the same group
• Affected: carbonlink.py, storage.py, utils.py, test files

Code formatting (E251, E275, E302, E701)

• Fixed keyword argument spacing: tzinfo = s.tzinfo → tzinfo=s.tzinfo
• Split multi-statement lines to separate lines
• Added missing blank lines before function definitions
• Added whitespace after not keyword

Line length (E501)

• Wrapped long lines in config.py and functions.py

Ambiguous variable names (E741)

• Renamed single-letter variables: l → series, line, empty

Warning stacklevel (B028)

• Added stacklevel=2 to all warnings.warn() calls for better tracebacks

Unsafe getattr (B009)

• Replaced getattr(whisper, '__readHeader') with direct access

Default argument mutability (B008)

• Moved mutable default arguments to module-level constants

Generic exception assertions (B017)

• Added # noqa: B017 where code raises generic Exception type

Example

Before:

warnings.warn("'cache' is provided in the configuration but "
              "Flask-Caching is not installed. Please `pip install "
              "Flask-Caching`.")

After:

warnings.warn(
    "'cache' is provided in the configuration but "
    "Flask-Caching is not installed. Please `pip install "
    "Flask-Caching`.", stacklevel=2)

Original prompt

Run flake8 on the codebase and fix errors it reports

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