fix: text encoding issues

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[Copilot]

Pull request overview

This PR addresses text encoding issues when reading/searching files inside local GitHub zip archives by decoding zip entry bytes as UTF-8 (with replacement on decode errors), and adds regression tests to ensure non-ASCII content is handled correctly without leaking Python bytes representations.

Changes:

• Decode zip entry lines via line.decode("utf-8", errors="replace") in search_zipfile() to correctly match non-ASCII search terms.
• Decode zip entry lines in get_file() so returned content is str (not bytes) and safe for downstream formatting/joining.
• Add tests covering non-ASCII text, invalid UTF-8 bytes, and tool outputs to ensure decoded/numbered lines are returned.

Show a summary per file

File	Description
tests/test_local_file_viewer.py	Adds regression tests verifying decoded output for non-ASCII and invalid UTF-8 content.
src/seclab_taskflows/mcp_servers/local_file_viewer.py	Fixes zipfile line handling by decoding bytes to str for search and file reads.

Review details

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• Files reviewed: 2/2 changed files
• Comments generated: 2
• Review effort level: Low

[Copilot]

Review details

• Files reviewed: 3/3 changed files
• Comments generated: 1
• Review effort level: Low