chore(cask): update ds to v0.18.6

[docker-read-write]

Automated update from Dash release workflow.

Version: v0.18.6
SHA256 (darwin-arm64): eccb3f1bcaa373a43f431201da0de29537e04041414a30158dd8e89e41e64136

Changes:

• Updated Casks/ds.rb (latest)
• Added Casks/ds@0.18.6.rb (pinned)

Release Notes

Highlights

Expanded default network policy domains. This release adds comprehensive default network policy domains for the proxy, making it easier for agents to work with common services out of the box.

CLI improvements. Standardized help text across commands, added backend component version info to ds version, and fixed sandbox name handling to allow dots.

TUI refinements. Dialog logic has been centralized for better consistency and maintainability, and PolicyKit auth handling has been fixed.

What's New

Networking

• Add comprehensive default network policy domains for proxy (#1698)
• Fix PolicyKit auth client usage (#1720)

CLI

• Show backend runtime component versions in ds version (#1643)
• Standardize wording across help output for commands (#1482)
• Sanitize Docker volume names to allow dots in sandbox names (#1723)

TUI

• Centralize dialog logic refactoring (#1678)

Workflows

• Add uninstall preflight step to stop daemon before uninstalling (#1590)

Bug Fixes

• Fix brew cask formatting (#1696)