feat(branding): ISO boot splash from the vendored Nomarchy logo

Vendor the vector logo from the legacy branch
(modules/nixos/branding/logo.svg) and use it for the live ISO's isolinux
splash: rsvg-convert renders it, recolored to the palette accent and
centred on the theme base (from theme-state.json) at build time, wired via
isoImage.splashImage in hosts/live.nix. Verified the generated PNG by
building it in the sandbox.

UEFI/GRUB still uses the stock theme (grubTheme needs a full theme dir —
left on the roadmap), as does the distroId switch.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

.claude/settings.local.json

@@ -273,7 +273,10 @@
       "Bash(nix-instantiate --parse modules/nixos/plymouth.nix)",
       "Bash(echo \"parse OK\")",
       "Bash(echo \"=== build the plymouth theme derivation directly ===\")",
-      "Bash(nix-instantiate --parse modules/nixos/default.nix)"
+      "Bash(nix-instantiate --parse modules/nixos/default.nix)",
+      "Bash(cp /nix/store/f18ij42lmpg07fn1m29aplayakx7kqpz-splash-test.png/* preview-splash-built.png)",
+      "Bash(cp /nix/store/f18ij42lmpg07fn1m29aplayakx7kqpz-splash-test.png preview-splash-built.png)",
+      "Bash(nix-instantiate --parse hosts/live.nix)"
     ]
   }
 }

README.md

@@ -318,8 +318,11 @@ close · `SUPER+1..9` workspaces · `Print` region screenshot.
   (os-release `PRETTY_NAME`, systemd-boot entries, ISO menu label).
   ✓ tuigreet greeting (`Welcome to <distroName>`) and a branded `users.motd`
   (doubling as a helper cheat sheet), both keyed off `distroName`.
-  Remaining: `isoImage.splashImage`/`grubTheme` art for the ISO boot
-  screen (needs a designed asset), and the `distroId` question (it changes
+  ✓ `isoImage.splashImage` — the vendored vector logo
+  (`modules/nixos/branding/logo.svg`, from legacy) recolored to the palette
+  accent on the theme base, built at ISO-build time (`hosts/live.nix`).
+  Remaining: `isoImage.grubTheme` so UEFI boot matches the isolinux splash
+  (needs a full grub theme dir), and the `distroId` question (it changes
   `DEFAULT_HOSTNAME` and upstream `isNixos` checks — needs a test pass;
   nixos-* CLI names stay regardless)
 - **Theme-switch feedback:** ✓ the "rebuilding…" notification is now

hosts/live.nix

@@ -3,11 +3,27 @@
 # exists to test the distro end-to-end on real hardware.
 { lib, pkgs, username, nomarchySrc, ... }:
 
+let
+  # ISO boot splash: the Nomarchy monogram recolored to the palette accent,
+  # centred on the theme base. Built from the vendored vector logo and the
+  # live theme-state.json (tokyo-night by default). Shows on the isolinux
+  # (BIOS) boot menu; UEFI/GRUB still uses the stock theme (see roadmap).
+  state = builtins.fromJSON (builtins.readFile ../theme-state.json);
+  isoColor = key: fallback: lib.removePrefix "#" ((state.colors or { }).${key} or fallback);
+  isoSplash = pkgs.runCommand "nomarchy-iso-splash.png"
+    { nativeBuildInputs = [ pkgs.imagemagick pkgs.librsvg ]; } ''
+    rsvg-convert -h 320 ${../modules/nixos/branding/logo.svg} > logo.png
+    magick logo.png -fill "#${isoColor "accent" "7aa2f7"}" -colorize 100 logo-c.png
+    magick -size 1920x1080 xc:"#${isoColor "base" "1a1b26"}" \
+      logo-c.png -gravity center -composite $out
+  '';
+in
 {
   networking.hostName = "nomarchy-live";
 
   isoImage.volumeID = lib.mkForce "NOMARCHY_LIVE";
   isoImage.edition = lib.mkForce "live";
+  isoImage.splashImage = isoSplash;
 
   # The minimal-CD profile slims the image for a CONSOLE installer; this
   # ISO is the desktop, so re-enable what it strips. Above all

modules/nixos/branding/logo.svg

@@ -0,0 +1,64 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!-- Created with Inkscape (http://www.inkscape.org/) -->
+
+<svg
+   width="157.40488mm"
+   height="162.48518mm"
+   viewBox="0 0 157.40488 162.48518"
+   version="1.1"
+   id="svg1"
+   xml:space="preserve"
+   inkscape:version="1.4.3 (0d15f75042, 2025-12-25)"
+   sodipodi:docname="icon.svg"
+   inkscape:export-filename="logo.png"
+   inkscape:export-xdpi="96"
+   inkscape:export-ydpi="96"
+   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
+   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:svg="http://www.w3.org/2000/svg"><sodipodi:namedview
+     id="namedview1"
+     pagecolor="#ffffff"
+     bordercolor="#000000"
+     borderopacity="0.25"
+     inkscape:showpageshadow="2"
+     inkscape:pageopacity="0.0"
+     inkscape:pagecheckerboard="0"
+     inkscape:deskcolor="#d1d1d1"
+     inkscape:document-units="mm"
+     inkscape:zoom="0.82803284"
+     inkscape:cx="216.175"
+     inkscape:cy="452.27675"
+     inkscape:window-width="1914"
+     inkscape:window-height="1012"
+     inkscape:window-x="0"
+     inkscape:window-y="0"
+     inkscape:window-maximized="0"
+     inkscape:current-layer="layer1"><inkscape:page
+       x="0"
+       y="-1.1741086e-21"
+       width="157.40488"
+       height="162.48518"
+       id="page2"
+       margin="0"
+       bleed="0" /></sodipodi:namedview><defs
+     id="defs1" /><g
+     inkscape:label="Layer 1"
+     inkscape:groupmode="layer"
+     id="layer1"
+     transform="translate(-28.332214,-25.599269)"><g
+       id="g4"
+       transform="translate(3.1953242,-22.686801)"
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