blankpad(niri): pin outputs; run both PM1601 externals portrait (transform 90)

- DP-2 at 1536,0 and HDMI-A-1 at 2736,0, both 1200x1920 portrait, scale 1
- eDP-1 pinned at 0,0 with explicit scale 1.25 (output blocks reset unspecified props)
- niri transform is counter-clockwise: 90 = top bezel left, 270 = top bezel right

dotfiles/zz-blankpad/niri/.config/niri/cfg/display.kdl

@@ -1,9 +1,27 @@
 // ────────────── Output Configuration ──────────────
 // You can run `niri msg outputs` to get the correct name for your displays.
-// You will have to remove "/-" and edit it before it takes effect.
 // https://github.com/YaLTeR/niri/wiki/Configuration:-Outputs
+//
+// eDP-1 (laptop panel) is pinned too: an output block resets unspecified
+// properties to defaults, so its 1.25 scale must be repeated here.
+//
+// Both external PM1601 panels run portrait. niri's transform is
+// counter-clockwise: "90" = panel's top bezel faces left, "270" = top bezel
+// faces right. Swap both values to flip the pair.
 
-/- output "DP-1" {
-    mode "2560x1440@359.979" // Set resolution and refresh rate
-    scale 1 // No scaling (use 2 for HiDPI)
+output "DP-2" {
+    scale 1
+    transform "90"
+    position x=1536 y=0
+}
+
+output "HDMI-A-1" {
+    scale 1
+    transform "90"
+    position x=2736 y=0
+}
+
+output "eDP-1" {
+    scale 1.25
+    position x=0 y=0
 }