Configure the Kuycon by what it is, not where it is plugged in

The panel's 4500x3000 mode, 1.5 scale, and 10-bit request were a rule
for connector DP-2 outright, which handed them to whatever monitor a
stranger's machine had on its most common DisplayPort connector. The
rule is now matched by description, the per-output prefs loop covers
every connector including DP-2, and the displays contract pins the
policy to the description rather than the port.

config/dot/hypr/monitors.lua

@@ -1,7 +1,7 @@
 -- ─────────────────────────────────────────────────────────────────────────────
 -- Monitors
 --
--- Kuycon P20 on DP-2: 4500x3000 @ 60Hz, 1.5x fractional scale.
+-- Kuycon P20 (matched by description): 4500x3000 @ 60Hz, 1.5x fractional scale.
 -- 4500/1.5 = 3000 and 3000/1.5 = 2000, both integers, so this is a "clean"
 -- fractional scale and Hyprland will not complain.
 --
@@ -125,17 +125,38 @@ local function display_position(entry, fallback)
     return fallback
 end
 
+-- Every connected output uses the same validated per-output store. Automatic
+-- placement and the compositor's normal color policy unless the entry says
+-- otherwise.
+for output, _ in pairs(displays) do
+    local entry = display_entry(output)
+    if entry ~= nil then
+        hl.monitor({
+            output = output,
+            mode = entry.mode,
+            position = display_position(entry, "auto"),
+            scale = entry.scale,
+            transform = entry.transform,
+        })
+    end
+end
+
+-- The Kuycon P20, matched by what it is rather than where it is plugged in.
+-- This used to be a rule for connector DP-2 outright, which handed the panel's
+-- 4500x3000 mode and 1.5 scale to whatever monitor a stranger's machine had on
+-- its most common DisplayPort connector. Emitted after the prefs loop so a
+-- saved entry for its connector still carries the mode/scale/position, while
+-- this rule holds the shipped defaults and the panel-specific color policy.
 local shipped_mode = "4500x3000@60"
 local shipped_scale = 1.5
 local shipped_transform = 0
-local dp2 = display_entry("DP-2")
-
+local kuycon = display_entry("DP-2")
 hl.monitor({
-    output   = "DP-2",
-    mode     = dp2 and dp2.mode or shipped_mode,
-    position = display_position(dp2, "0x0"),
-    scale    = dp2 and dp2.scale or shipped_scale,
-    transform = dp2 and dp2.transform or shipped_transform,
+    output   = "desc:GVT Kuycon P20",
+    mode     = kuycon and kuycon.mode or shipped_mode,
+    position = display_position(kuycon, "0x0"),
+    scale    = kuycon and kuycon.scale or shipped_scale,
+    transform = kuycon and kuycon.transform or shipped_transform,
 
     -- 10-bit output. 4500x3000@60 at 10bpc is ~24 Gbps, right at the edge of
     -- DP 1.4 HBR3, so this relies on DSC. If the display fails to light up or
@@ -146,24 +167,6 @@ hl.monitor({
     cm = "auto",
 })
 
--- Other connected outputs use the same validated per-output store. They keep
--- automatic placement and the compositor's normal color policy; DP-2 alone
--- carries the panel-specific 10-bit policy documented above.
-for output, _ in pairs(displays) do
-    if output ~= "DP-2" then
-        local entry = display_entry(output)
-        if entry ~= nil then
-            hl.monitor({
-                output = output,
-                mode = entry.mode,
-                position = display_position(entry, "auto"),
-                scale = entry.scale,
-                transform = entry.transform,
-            })
-        end
-    end
-end
-
 -- Any monitor not named above: sane defaults rather than nothing.
 hl.monitor({
     output   = "",