Fix file encoding support bom, latin1, Windows files

[peteretelej]

Detect encoding detection for diff files instead of failing miserably, especially for Windows specific ones windows1252, bom :(, latin-1
Strip markers to avoid breaking reads.

Fixes #1

[Copilot]

Pull Request Overview

This PR implements encoding detection for diff files to fix issues with Windows-specific encodings (Windows-1252, BOM, Latin-1) that were previously causing failures. The changes enable robust handling of various file encodings instead of failing when UTF-8 decoding fails.

• Replaces single UTF-8 file reading with multi-encoding detection (UTF-8, UTF-8-sig, cp1252, latin-1)
• Adds BOM stripping functionality to handle UTF-8 files with byte order marks
• Includes comprehensive test coverage for different encoding scenarios

Reviewed Changes

Copilot reviewed 7 out of 8 changed files in this pull request and generated 2 comments.

File	Description
src/parser.py	Implements new _read_diff_file method with multi-encoding support and BOM handling
tests/test_windows_repro.py	Adds test class to verify encoding scenarios work correctly
tests/test_data/minimal_*.diff	Test fixtures for UTF-8, Windows CRLF, BOM, and Latin-1 encoded diff files
.github/ISSUE_TEMPLATE/bug_report.yml	Simplifies bug report template by removing required fields and verbose descriptions

Comments suppressed due to low confidence (1)

tests/test_windows_repro.py:33

• The assertion only checks that chunks > 0 but doesn't validate the actual content was parsed correctly. Consider adding assertions that verify the parsed content matches expected values for each encoding scenario.

            assert result["chunks"] > 0, f"{filename} should work with fix"

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