Stop macOS dashboard polling from flashing the terminal title

[lefoulkrod]

Summary

• detach hidden macOS helper commands from the terminal session
• poll container status and resources through the existing Podman machine Unix API socket on macOS
• preserve the existing Podman CLI execution path on Linux and Windows

Root cause

macOS Terminal tracks short-lived descendant processes for its active-process title. Moving each Podman poll into another process group or session was not sufficient, so the three-second dashboard refresh still made the title alternate between podman and omnideck.

The dashboard now reads inspect and stats data directly from $TMPDIR/podman/omnideck-runtime-api.sock, which removes the periodic Podman child process while preserving the same status, health, restart, CPU, and memory updates.

Impact

The macOS title remains stable while dashboard resources continue updating every three seconds. Linux and Windows continue using the existing CLI-backed implementation.

Validation

• manually confirmed the title remains stable on the Apple Silicon MacBook lab host
• confirmed live status and stats responses from the exact Podman service endpoints on that host
• go test ./... on Linux using the pinned Go 1.25.13 container
• Linux AMD64 build
• Windows AMD64 build and compilation of all Windows test packages
• Darwin AMD64 and ARM64 builds
• go vet ./...