✨ feat: add configurable tool path resolution

[vaayne]

Summary

• add shared binary resolution for tmux, lazygit, and yazi
• persist explicit tool path overrides in Settings > Tools
• use resolved local executable paths when launching companion tools and tmux-backed flows

Why

Issue #54 reports Mori failing to detect tmux installed in a custom Homebrew prefix like ~/homebrew/bin/tmux. The root problem was broader than tmux availability: different code paths used different PATH assumptions, and local launches for tmux/lazygit/yazi still depended on the app's inherited environment.

This change introduces a single resolver with explicit user overrides, common package-manager fallback directories, and PATH lookup, then applies it consistently across tmux detection and local tool launching.

Changes

• add ToolSettings persistence in MoriCore
• add shared BinaryResolver in MoriCore
• update TmuxCommandRunner to use configured paths + shared resolution
• add Settings > Tools UI for tmux/lazygit/yazi path overrides
• update local tool detection to use the shared resolver instead of /usr/bin/which
• update local command launches to use resolved executable paths
• add tests for tool settings + binary resolution
• update changelog and localizations

Validation

• mise run test:core
• mise run test:tmux
• mise run test
• swift build -c release --product Mori

Closes #54

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