Fix #43 (#45) Fix macOS single-instance port collision with Zed

[Max-109]

Context

Fixes #43

Glass inherited Zed's macOS single-instance port range (base 43737) and handshake check. Both apps bind the same per-channel localhost port on startup to enforce "only one instance running." When Zed already holds that port, Glass sees the handshake, concludes it is already running, and exits immediately (and vice versa) a.k.a crashes.

This changes Glass to use its own base port (44737) so the two apps no longer collide.

How to Review

One file: crates/zed/src/zed/mac_only_instance.rs. The only functional change is the port base constant and the four match arms that reference it. The comment block above the match was updated to reflect the new example port numbers.

Self-Review Checklist

• I've reviewed my own diff for quality, security, and reliability
• Unsafe blocks (if any) have justifying comments
• The content is consistent with the UI/UX checklist
• Tests cover the new/changed behavior
• Performance impact has been considered and is acceptable

Release Notes:

• Fixed Glass exiting immediately when Zed is already running

[naaiyy]

Good to merge. I'll make a small cleanup follow-up for the inherited Zed naming in a separate PR.