Fonts + kitty config in the desktop

- tanin-eww: ship Fuji kitty.conf into skel (~/.config/kitty)
- add missing font deps to tanin-eww + tanin-desktop:
  ttc-iosevka-aile (bar's 'Iosevka Aile' UI font) + ttf-nerd-fonts-symbols
  ('Symbols Nerd Font' icon fallback). ttf-iosevka-nerd covers kitty.
- start archiso profile under iso/ (releng-base + overrides; systemd-boot,
  btrfs+snapshots, plymouth, linux-zen, Calamares clone-install)

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

iso/overrides/airootfs/usr/local/bin/tanin-installer

@@ -0,0 +1,4 @@
+#!/usr/bin/env bash
+# Launch the Calamares installer fullscreen in a cage kiosk compositor (Wayland,
+# straight on DRM — no display-manager needed in the live session).
+exec cage -s -- calamares