Fix session guard bypass, missing stderr redirects, and uninitialized…

[assisted-by-ai]

… variables

• X11_Xsession.d_15_sysmaint_no_desktop: Fix always-false session check that compared hardcoded 'sysmaint-session' against itself instead of checking $DESKTOP_SESSION, completely bypassing the safety guard
• sysmaint-boot: Add missing >&2 redirects to printf statements in remove_sysmaint_qubes() so diagnostic messages go to stderr like all other messages in the script
• sysmaint-session, sysmaint-session-wayland: Initialize selected_system_tray and selected_system_tray_args to empty strings before the search loop to avoid referencing uninitialized variables
• grub.d_10_10_linux_sysmaint: Remove redundant if/elif/else where all branches assigned the same value

https://claude.ai/code/session_01QxHdBF7NnawVe5KW5cwttV

This pull request changes...

Changes

Mandatory Checklist

• Legal agreements accepted. By contributing to this organisation, you acknowledge you have read, understood, and agree to be bound by these these agreements:

Terms of Service, Privacy Policy, Cookie Policy, E-Sign Consent, DMCA, Imprint

Optional Checklist

The following items are optional but might be requested in certain cases.

• I have tested it locally
• I have reviewed and updated any documentation if relevant
• I am providing new code and test(s) for it

Fixes #

[ArrayBolt3]

Accepted almost all of the fixes as-is in ArrayBolt3@2d00f18. However, I'm using $XDG_CURRENT_DESKTOP rather than $DESKTOP_SESSION in the sysmaint GUI login check, because that's the variable that sysmaint-session-wayland sets.