fix: persist zsh history on Kali look, skip TerminalLook module cleanly on missing prereqs

- write_zshrc_kali now sets HISTFILE/HISTSIZE/SAVEHIST and share_history/
  hist_ignore_dups so command history survives across sessions (previously
  unset, so history was in-memory only despite shipping
  zsh-history-substring-search and fzf history search).
- apply_terminal_look now guards install_terminal_prereqs and returns 0 with
  a skip message on failure, matching apply_hyprland's existing pattern, so
  an unrecognized package manager no longer aborts the whole script under
  set -euo pipefail and blocks a Hyprland module that would otherwise
  succeed.

Addresses findings 1 and 2 from the final whole-branch review.

install.sh

@@ -421,6 +421,11 @@ apply_terminal_look_p10k() {
 write_zshrc_kali() {
     local dest="$1"
     cat > "$dest" <<'EOF'
+HISTFILE=~/.zsh_history
+HISTSIZE=10000
+SAVEHIST=10000
+setopt share_history hist_ignore_dups
+
 source "$HOME/.dotevo/kali-prompt.zsh"
 source "$HOME/.dotevo-zsh-custom/plugins/zsh-autosuggestions/zsh-autosuggestions.zsh"
 source "$HOME/.dotevo-zsh-custom/plugins/zsh-syntax-highlighting/zsh-syntax-highlighting.zsh"
@@ -454,7 +459,11 @@ chsh_to_zsh() {
 }
 
 apply_terminal_look() {
-    install_terminal_prereqs
+    if ! install_terminal_prereqs; then
+        echo "dotevo: skipping Terminal look -- prerequisites unavailable"
+        return 0
+    fi
+
     run_terminal_look_picker
 
     case "$PICK_TERMINAL_LOOK" in