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/pacman.conf

@@ -0,0 +1,25 @@
+# Build-time pacman.conf for mkarchiso (pulls live packages incl. tanin-desktop).
+# Replaces releng's pacman.conf. [tanin] is added so the airootfs can include
+# our packages. SigLevel=Never on [tanin] keeps the BUILD simple (no keyring
+# bootstrap during mkarchiso); the LIVE/target keyring trusts the key properly
+# (see airootfs/etc/pacman.conf + customize_airootfs.sh).
+[options]
+HoldPkg     = pacman glibc
+Architecture = auto
+CheckSpace
+SigLevel    = Required DatabaseOptional
+LocalFileSigLevel = Optional
+ParallelDownloads = 5
+
+[core]
+Include = /etc/pacman.d/mirrorlist
+
+[extra]
+Include = /etc/pacman.d/mirrorlist
+
+[multilib]
+Include = /etc/pacman.d/mirrorlist
+
+[tanin]
+SigLevel = Never
+Server = https://git.openbureau.ch/api/packages/karim/arch/tanin/$arch