Use bundled status bar icons

[Disconnecter]

Summary

• replace runtime SF Symbol rendering with bundled raster status-bar assets
• add active, muted, stopped, and unavailable color variants
• provide native macOS 1x and Retina 2x resources
• force original rendering to preserve status colors

Validation

• visually checked local test build
• all four asset names compile into Assets.car
• arm64 macOS build passes
• SwiftLint passes with zero violations
• Swift LSP diagnostics pass