Feature Request: Project directory registry for mobile session spawning

[BTForIT]

Summary

Add the ability to pre-register project directories so the mobile app can browse and start sessions remotely without needing to run happy from the terminal first.

Use Case

I have 20+ projects in ~/GitProjects/. Currently, I have to:

1. Go to my Mac
2. cd ~/GitProjects/SomeProject
3. Run happy
4. Then it appears on mobile

I want to:

1. Open Happy app on phone
2. See list of my registered projects
3. Tap one → daemon starts session in that directory

Proposed Implementation

Config file (~/.happy/settings.json):

{
  "projectDirectories": [
    "~/GitProjects/*",
    "~/Work/ClientA"
  ]
}

Mobile app:

• New "Projects" tab showing directories matching the patterns
• Tap a project → sends command to daemon → daemon spawns session in that directory

CLI:

happy projects add ~/GitProjects/*
happy projects list
happy projects remove ~/GitProjects/OldProject

Benefits

• Start sessions from anywhere (phone, tablet) without Mac access
• Quick project switching from mobile
• Better integration with existing daemon infrastructure

Current Workaround

None - must physically access the machine to start sessions.

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macOS 15.2, happy-coder 0.13.0