Add host setup script for Starship + JetBrainsMono Nerd Font

Pairs with the Terminal page's Nerd Font glyph fallback: run this on any VM you SSH into from ArchNest to get a full icon-rich Starship prompt, not just working icon rendering.

scripts/install-starship-nerdfont.sh

@@ -0,0 +1,73 @@
+#!/usr/bin/env bash
+# Installs Starship (the prompt) + JetBrainsMono Nerd Font (the icons) on a
+# host you SSH into from ArchNest's Terminal page, and wires Starship into
+# bash/zsh if either is present. Safe to re-run.
+#
+# This repo is private, so there's no public raw-URL one-liner. Run it directly
+# on the target VM instead, as the user whose shell you want themed:
+#   scp scripts/install-starship-nerdfont.sh youruser@host:/tmp/
+#   ssh youruser@host 'bash /tmp/install-starship-nerdfont.sh'
+# or paste its contents into a Terminal/SSH session and run it there.
+
+set -euo pipefail
+
+NERD_FONT_VERSION="v3.4.0"
+NERD_FONT_NAME="JetBrainsMono"
+FONT_DIR="${HOME}/.local/share/fonts/NerdFonts"
+
+echo "==> Installing Starship"
+if command -v starship >/dev/null 2>&1; then
+  echo "    starship already installed ($(starship --version | head -1)), skipping"
+else
+  curl -fsSL https://starship.rs/install.sh | sh -s -- -y
+fi
+
+echo "==> Installing ${NERD_FONT_NAME} Nerd Font into ${FONT_DIR}"
+mkdir -p "${FONT_DIR}"
+TMP_TAR="$(mktemp)"
+curl -fsSL -o "${TMP_TAR}" \
+  "https://github.com/ryanoasis/nerd-fonts/releases/download/${NERD_FONT_VERSION}/${NERD_FONT_NAME}.tar.xz"
+tar -xJf "${TMP_TAR}" -C "${FONT_DIR}"
+rm -f "${TMP_TAR}"
+
+if command -v fc-cache >/dev/null 2>&1; then
+  fc-cache -f "${FONT_DIR}" >/dev/null
+fi
+
+STARSHIP_INIT_BASH='eval "$(starship init bash)"'
+STARSHIP_INIT_ZSH='eval "$(starship init zsh)"'
+
+add_init_line() {
+  local rcfile="$1" line="$2"
+  [ -f "${rcfile}" ] || return 0
+  if ! grep -qF "${line}" "${rcfile}"; then
+    printf '\n# Added by ArchNest install-starship-nerdfont.sh\n%s\n' "${line}" >> "${rcfile}"
+    echo "    added Starship init to ${rcfile}"
+  else
+    echo "    ${rcfile} already initializes Starship, skipping"
+  fi
+}
+
+echo "==> Wiring Starship into shell rc files"
+add_init_line "${HOME}/.bashrc" "${STARSHIP_INIT_BASH}"
+add_init_line "${HOME}/.zshrc" "${STARSHIP_INIT_ZSH}"
+
+mkdir -p "${HOME}/.config"
+if [ ! -f "${HOME}/.config/starship.toml" ]; then
+  starship preset nerd-font-symbols -o "${HOME}/.config/starship.toml" 2>/dev/null \
+    || echo "    (preset command unavailable on this Starship version — using its built-in default prompt, which already includes icons)"
+fi
+
+cat <<EOF
+
+Done.
+
+Next steps:
+1. In ArchNest's Terminal page, open Settings (gear icon) and pick a font —
+   any of the listed options now layers in icon glyphs automatically.
+2. Open a NEW terminal session to this host (or run 'exec \$SHELL -l') to
+   pick up the new prompt — it won't apply to sessions already connected.
+
+Font installed to: ${FONT_DIR}
+Starship config:   ${HOME}/.config/starship.toml
+EOF