Wait for the live VT to settle before drawing the first screen

tty1 boots as an 80-column console and only widens once the kernel
framebuffer/KMS takes over, which lands late — especially in VMs. The
configurator's logo is wider than 80 columns, so the very first draw
measured against that transient narrow console: the logo wrapped
("smushed") and, with left padding clamped to zero, hugged the left
edge. Every later screen re-measures once the console has grown, which
is why only the opening keyboard screen looked wrong.

Hold the first draw until the width settles at or above the logo width,
capped so a console that never widens still proceeds. Terminal emulators
(dry runs) are already at final size and are skipped.

Co-Authored-By: Claude <noreply@anthropic.com>

configs/airootfs/root/configurator

@@ -38,6 +38,33 @@ measure_terminal() {
 }
 measure_terminal
 
+# The live VT resizes late during boot: tty1 starts as the 80-column boot
+# console and only grows once the kernel framebuffer/KMS takes over (noticeably
+# late in VMs). The logo is wider than 80 columns, so a first draw against that
+# transient narrow console wraps the logo ("smushed") and can't center it
+# (padding clamps to 0, so it hugs the left). Every later screen re-measures and
+# looks right, so this only bites the very first screen. Hold that first draw
+# until the width settles at (or above) the logo width. Terminal emulators (dry
+# runs) are already at final size, so skip them; a real VT that never widens
+# (e.g. nomodeset) still proceeds after the cap rather than hanging.
+wait_for_stable_terminal() {
+  [[ $(tty 2>/dev/null) == /dev/tty* ]] || return 0
+
+  local width last="" stable=0 waited=0
+  while (( waited < 5000 )); do
+    width=$(stty size 2>/dev/null </dev/tty | awk '{print $2}')
+    [[ $width =~ ^[0-9]+$ ]] || width=0
+    if [[ $width == "$last" ]] && (( width >= LOGO_WIDTH )); then
+      (( ++stable >= 3 )) && break
+    else
+      stable=0
+    fi
+    last=$width
+    sleep 0.2
+    (( waited += 200 ))
+  done
+}
+
 clear_logo() {
   measure_terminal
   printf "\033[H\033[2J"
@@ -944,6 +971,10 @@ select_installation() {
 defer_provisioning=false
 install_target="full_disk"
 
+# Let the live VT reach its settled width before the first screen so the logo
+# isn't measured against the transient 80-column boot console.
+wait_for_stable_terminal
+
 keyboard_form true
 
 if $defer_provisioning; then