fix(linux): select graphical login session

[msegec]

Problem

A Linux user can have multiple active logind sessions. The user-manager session may appear first with an empty Display, causing MeshAgent to pass no display to the remote desktop path even when the active seat is X11 on :0.

Fix

Skip active sessions without a display and continue to the active graphical session.

Verification

• Reproduced on Arch Linux ARM with active manager and seat sessions
• Existing selector returned an empty display
• Updated selector returned :0

Built with GPT-5.6-sol via Codex in T3 Code.

[si458]

you havent followed the pull request template because you edited a module which needs to be encoded in the polyfills.c file

Summary

In this pull request, the following changes are made:

• Foobar was changed to FooFoo, because ...

• Relates to #issue-number
• Resolves #issue-number

Please follow this checklist to avoid unnecessary back and forth (click to expand)

• 🧠 I used LLMs/AI in this contribution and reviewed all generated content.
  I understand that I am responsible for and able to explain every line of code I submit.
• 🛠️ I have self-reviewed my code and self-tested it against a MeshCentral server to ensure it works as expected.
• 🖥️ My change compiles on every platform it affects (Windows / Linux / macOS / FreeBSD), and I have considered
  the impact on platforms and architectures I could not test.
• 📦 If I changed JavaScript modules under modules/, I re-embedded them so the compiled-in copies in
  microscript/ILibDuktape_Polyfills.c match (the agent runs the embedded copies, not the files on disk).
• 🤖 I ran the agent self-test where appropriate (see "Self Test" in readme.md).
• 📄 Documentation updates are included (if applicable), e.g. the .msh options table in readme.md.
• 🧰 Updates to vendored dependencies (OpenSSL, zlib, ...) are listed and explained.
• ⚠️ CI passes and is green (Windows / Linux / macOS / FreeBSD builds and CodeQL).

Testing

Platform (OS / distro / arch)	Tested	Result
e.g. Windows 11 x64	✅
e.g. Debian 13 x64 (Wayland)	✅

Screenshots for Visual Changes

Event	Before	After

[si458]

@msegec plz can you fix the conflict?
you will need to merge latest commits we pulled in
then run the polyfill again as the modules/monitor-info.js has changed :)