Code quality improvements: Remove unused imports and fix whitespace issues

[Copilot]

This PR improves code quality across the CodeTuneStudio repository by cleaning up unused imports and fixing whitespace formatting issues. All changes are non-functional style improvements that enhance maintainability and PEP 8 compliance.

Overview

Reduced flake8 violations by 45% (from 167 to 92) across 27 Python files with zero functional changes.

Changes Made

1. Removed Unused Typing Imports (F401)

Cleaned up 60+ unused typing imports by leveraging modern Python 3.9+ type hint syntax (PEP 585). The codebase already uses the newer dict[str, Any] syntax instead of typing.Dict[str, Any], making these imports unnecessary.

Files updated:

• Utils module (10 files): Removed unused Dict, List, Optional, Union, Tuple, Set imports
• Plugins module (3 files): Cleaned up unused typing imports
• Components & app.py (8 files): Removed obsolete import statements

Example:

# Before
from typing import Any, Dict, List, Optional
def validate_config(config: dict[str, Any]) -> list[str]:
    ...

# After  
from typing import Any
def validate_config(config: dict[str, Any]) -> list[str]:
    ...

2. Fixed Whitespace Issues (W291/W292/W293/W391)

Fixed all 16 whitespace violations:

• W291: Removed trailing whitespace from HTML/CSS blocks in app.py
• W292: Added missing newlines at end of files (__init__.py files)
• W293: Fixed blank lines containing whitespace in loading_animation.py and app.py
• W391: Removed extra blank line at end of config_validator.py

3. Repository Cleanup

Removed __pycache__ files from git tracking (already excluded in .gitignore).

Impact

Metric	Before	After	Improvement
Total violations	167	92	-45%
Unused imports (F401)	70	10	-86% (only test files remain)
Whitespace issues	16	0	-100%
Critical errors	0	0	✓ Clean

Verification

• ✅ All Python files compile successfully
• ✅ Zero critical errors (E9, F63, F7, F82)
• ✅ Type safety preserved with modern Python 3.9+ syntax
• ✅ All docstrings and documentation intact
• ✅ No functional changes

Remaining Issues

The 92 remaining flake8 issues are acceptable and require separate refactoring efforts:

• E501 (73): Long lines in docstrings/comments (acceptable for documentation)
• C901 (6): Complex functions requiring refactoring (separate task)
• F401 (10): Unused imports in test files only
• E302/E305 (3): Auto-generated migration files

All changes comply with the project's security guidelines and coding standards.

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