Support CLAUDE_CONFIG_DIR and checking multiple claude config dirs

[ndom91]

• support the CLAUDE_CONFIG_DIR environment variable instead of hardcoding ~/.claude/projects
• check custom CLAUDE_CONFIG_DIR dirs as well as the default one
• Fixes: Claude Code watcher hardcodes ~/.claude/projects/ — doesn't see sessions under $CLAUDE_CONFIG_DIR (e.g. ~/.claude-personal/) #44
• I'm not very fluent with Rust, so this was written with significant claude assistance.

[inspect-review]

inspect review

Triage: 11 entities analyzed | 0 critical, 0 high, 3 medium, 8 low
Verdict: standard_review

Findings (3)

1. [low] In claude_code_projects_dirs_deduplicate_env_and_scan_matches test, the environment variable is set to an absolute path but the function expects it to be expanded. The test passes an absolute path home.join(".claude-personal") which won't match the tilde expansion logic in expand_home_path, so deduplication won't work as expected.
2. [low] The expand_home_path function only handles tilde expansion for paths starting with ~ or ~/, but in the test claude_code_projects_dirs_deduplicate_env_and_scan_matches, an absolute path is passed. This means the path won't be expanded and deduplication won't occur, causing the test to fail because .claude-personal/projects will appear twice in the results.
3. [low] The expand_home_path function only handles tilde expansion for paths that are valid UTF-8 strings (via path.to_str()). If the path contains non-UTF-8 characters, it returns the original path unchanged, which could lead to incorrect behavior when CLAUDE_CONFIG_DIR contains non-UTF-8 characters on Unix systems.

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Reviewed by inspect | Entity-level triage found 0 high-risk changes