Fix Display panel monitor toggle under the Lua config parser

[gushy79]

Authorship: this fix was investigated and written by Claude Code
(Anthropic's agentic CLI). I reviewed it and am submitting it on its behalf.

Problem

The Display bar panel (shell/plugins/panels/monitor/Panel.qml) lists every
display with an enable/disable row, but toggleDisplay() runs:

hyprctl keyword monitor <name>,disable        # off
hyprctl keyword monitor <name>,preferred,auto,auto   # on

Hyprland disables the legacy hyprctl keyword IPC whenever the config is read
by the Lua parser:

$ hyprctl keyword monitor DP-3,disable
keyword can't work with non-legacy parsers. Use eval.

Omarchy v4 ships the Lua hypr config as the sole default (config/hypr/*.lua,
no hyprland.conf), so on a stock v4 install every monitor on/off row in the
panel is a silent no-op — the command errors on stderr, which the panel
doesn't surface. Brightness and scale in the same panel are unaffected; they
go through omarchy-* helpers.

Fix

Drive the Lua hl.monitor helper through hyprctl eval instead, which is the
same mechanism bin/omarchy-hyprland-monitor-internal already uses to disable
the internal display (hl.monitor({ output = ..., disabled = true })). The
connector name comes from omarchy-monitor-state (Hyprland .name), and is
guarded with the same ^[A-Za-z0-9._-]+$ check the bin/ monitor helpers
apply before interpolating a name into eval'd Lua.

-    actionProc.command = ["hyprctl", "keyword", "monitor", name + (enabled ? ",disable" : ",preferred,auto,auto")]
+    if (!/^[A-Za-z0-9._-]+$/.test(name)) return
+    actionProc.command = ["hyprctl", "eval",
+      "hl.monitor({ output = \"" + name + "\", disabled = " + (enabled ? "true" : "false") + " })"]

Re-enabling with disabled = false picks the mode/position back up from the
catch-all hl.monitor({ output = "", mode = "preferred", position = "auto" })
rule, matching the previous ,preferred,auto,auto behaviour. Like the old
code this is a runtime change and doesn't persist across a config reload —
semantics are unchanged there.

Testing

• ./test/shell — no new failures (the 6 pre-existing failures on my machine —
  config, locate, runtime-smoke, screenshot-sanity, snapper,
  unowned-system-paths — reproduce on a clean quattro checkout and are
  environmental).
• Manual, on Omarchy 4.0.3 with two external monitors: toggling each display
  row off/on from the panel now disables/re-enables the output
  (hyprctl monitors disabled: flips); before the patch the rows did
  nothing.

🤖 Generated with Claude Code