feat(branding): fastfetch logo + Nomarchy.ttf glyph in the Waybar button

Two branding follow-ups, using the vendored legacy assets:

- fastfetch (modules/home/fastfetch.nix, nomarchy.fastfetch.enable): the
  vector logo recolored to the palette accent and rendered to compact
  block-art via chafa at build time (so it tracks the theme), fronting a
  curated module list. Replaces the oversized legacy ASCII.
- Waybar logo glyph: vendor Nomarchy.ttf (modules/nixos/branding/),
  install it via fonts.packages, and switch the summer-day/night menu
  buttons to its U+F000 mark with `font-family: Nomarchy` pinned in CSS
  (Nerd Fonts also occupy U+F000, so the pin is required). Glyph stored as
  the  JSON escape for robustness.

Also log a roadmap item for a quality-of-life alias collection.

Verified: font family resolves as "Nomarchy" and the ttf maps U+F000;
both summer jsonc parse; chafa logo builds headless; nix flake check passes.

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

themes/summer-day/waybar.css

@@ -90,6 +90,10 @@ window#waybar {
   margin-left: 15px;
   padding-left: 20px;
   padding-right: 21px;
+  /* The Nomarchy mark lives at U+F000 in the dedicated "Nomarchy" font;
+     pin the family or the Nerd Font's glass icon at U+F000 wins. */
+  font-family: Nomarchy;
+  font-size: 18px;
 }
 
 #custom-powermenu {

themes/summer-day/waybar.jsonc

@@ -23,7 +23,7 @@
 
   "custom/launcher": {
     "interval": "once",
-    "format": "󰣇",
+    "format": "\uf000",
     "on-click": "nomarchy-menu",
     "tooltip-format": "Nomarchy menu"
   },