niri(blankpad): DP-2 back to landscape ultrawide, HDMI-A-1 bezel flipped

DP-2: transform 90 -> normal with mode 3440x1440@239.999 pinned, moved
(0,0) -> (1581,-600). HDMI-A-1: transform 270 -> 90 (portrait kept, top bezel
now on the left). eDP-1 re-pinned (2400,840) -> (5021,-240) to sit rightmost.
All three positions stay pinned so niri's auto-layout cannot reflow them.

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

@@ -10,18 +10,20 @@
 // faces right. In portrait a 180° flip is the 90<->270 swap.
 
 output "DP-2" {
+    mode "3440x1440@239.999"
+
     scale 1
-    transform "90"
-    position x=0 y=0
+    transform "normal"
+    position x=1581 y=-600
 }
 
 output "HDMI-A-1" {
     scale 1
-    transform "270"
+    transform "90"
     position x=1200 y=0
 }
 
 output "eDP-1" {
     scale 1.0          // MUST restate: dashed-out by the block otherwise
-    position x=2400 y=840
+    position x=5021 y=-240
 }