Fix the display panel's on/off rows under the Lua config parser

[kidskript3]

Fixes #10086.

The bug

The rows under DISPLAYS in the monitor panel do nothing. Clicking one leaves the display on, and nothing is reported anywhere.

Panel.qml toggles through the legacy syntax:

hyprctl keyword monitor <name>,disable

Omarchy configures Hyprland through the Lua parser, which refuses that outright — and hyprctl still exits 0, so the panel has nothing to react to:

$ hyprctl keyword monitor eDP-1,disable
keyword can't work with non-legacy parsers. Use eval.
$ echo $?
0

The fix

• Toggle through hyprctl eval with an hl.monitor({ ... }) rule.
• Spell out disabled = false when switching an output back on. Restating a mode alone returns ok and leaves an already-disabled output off.
• Restore the layout. Scale and position can only be read dependably while an output is on, and coming back with "auto" for both re-places the display and drops a scaled one to 1. omarchy-monitor-state now carries scale, x and y per display, and the panel remembers the last values it saw while an output was on.

Rule building and remembering are pure functions in Model.js, so both are unit-tested rather than only reachable through the UI.

Tests

• test/shell.d/monitor-test.sh — new assertions for monitorRule (disable, restore, and the auto fallback for an output never seen enabled) and rememberLayouts (records every enabled display, keeps the last layout of one that went off).
• test/shell.d/monitor-state-test.sh — fixtures and the display-list expectations extended to the new fields.
• Full test/shell run: 222 of 226 files pass. The four failures (bar-icon-geometry, config, snapper, unowned-system-paths) fail identically on an unmodified checkout of this branch point on this host.

Verified on hardware

Alienware m15 R7 — internal eDP-1 (2560x1440) plus an external 5120x1440 on DP-1, both at scale 1.25, Hyprland 0.56.2:

before   eDP-1 enabled=true  scale=1.25 at 4096x0
disable  hl.monitor({ output = "eDP-1", disabled = true })            -> ok
         eDP-1 enabled=false
enable   hl.monitor({ output = "eDP-1", disabled = false, mode = "preferred",
                      position = "4096x0", scale = 1.25 })            -> ok
after    eDP-1 enabled=true  scale=1.25 at 4096x0

hyprctl configerrors is empty throughout. The same sequence through hyprctl keyword changes nothing at all.

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