Make the i3lock lock screen pure black

[dolph]

Requested by Dolph · project thread

Before: the screen lock (i3lock, started by xss-lock) filled the screen with dark grey #1c1c1c.

After: the lock screen is pure black #000000, matching the desktop background and the LightDM greeter, which were already black.

How: changed the --color argument to i3lock in the i3 config template. IBM-managed machines use xscreensaver instead, and its appearance isn't managed by this repository, so it is unchanged.

🤖 Generated with Claude Code

https://claude.ai/code/session_01KUSAqMc7THsNCWwxV8oFHs

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[dolph]

CI is red here for reasons that are already red on master (for example run 37957357213 on a285dea), not because of this one-line i3 config change:

• Lint: ansible-lint v26 flags roles/desktop/tasks/i3.yml:47 (the "Report detected resolution" debug msg, 165 > 160 characters). This PR doesn't touch that file. Proposed patch: split the message with a folded scalar, e.g. msg: >- followed by the resolution=... and scale=... font_size=... parts on two lines.
• desktop / headless playbooks: the download of https://github.com/dolph/connectivity/releases/download/v1.7.12/connectivity-linux-amd64 returns 404, so every playbook job fails on master too.

No open PR fixes either yet, so I haven't ported anything into this one. Both failures are deterministic, so a re-run won't change them.

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