Repo guards check repolist, not just RPMs; PeaZip skips when any flavor exists

Laptop run (YuKu, existing machine) exposed two fresh-install blind
spots:

1. Terra add failed on a machine that already HAD the repo but not a
   queryable terra-release RPM — bootstrapping --repofrompath over an
   existing repo id collides. New repo_enabled() checks dnf repolist
   (the source of truth); add_terra_repo and add_rpmfusion_repo now
   skip when the repo is configured OR the release RPM present.

2. PeaZip tailoring tried gtk3 over an existing peazip-qt5: all UI
   flavors ship /usr/bin/peazip and file-conflict, transaction died.
   Any installed flavor (qt5/qt6/gtk3/gtk2) now wins and the section
   skips with the flavor named.

Harness: laptop sim (repo configured, peazip-qt5 present) -> zero
bootstrap calls, PeaZip skipped; fresh machine -> terra bootstraps +
gtk3 installs; re-run -> skip via repolist; peazip-qt6 + hyprland ->
skip; unattended/piped green.

setup.sh

@@ -639,16 +639,30 @@ rule
 # --- 8.1 PeaZip: toolkit variant follows the session (Qt6 for Qt-ish
 # environments, GTK3 for the rest) ---
 info "Tailoring toolkits for DE=$DE / TWM=$TWM..."
-if [[ "$DE" == "plasma" || "$TWM" == "hyprland" ]]; then
-    peazip_pkgs="peazip-common peazip-qt6"
+
+# First: is ANY PeaZip flavor already installed? The UI flavors all ship
+# /usr/bin/peazip and file-conflict with each other — installing gtk3 over
+# an existing qt5 dies mid-transaction (laptop-proven). Any present flavor
+# wins; skipping is correct.
+peazip_existing=""
+local_v=""
+for local_v in peazip-qt5 peazip-qt6 peazip-gtk3 peazip-gtk2; do
+    pkg_installed "$local_v" && peazip_existing="$local_v"
+done
+if [[ -n "$peazip_existing" ]]; then
+    ok "PeaZip already present ($peazip_existing) - skipping."
 else
-    # XFCE, GNOME, Niri, MangoWC, chadwm: lightweight/generic toolkits
-    peazip_pkgs="peazip-common peazip-gtk3"
-fi
-# shellcheck disable=SC2086
-if ! install_packages $peazip_pkgs; then
-    color_red "  Failed: $peazip_pkgs"
-    color_red "  (continuing — PeaZip is a convenience, not a dependency)"
+    if [[ "$DE" == "plasma" || "$TWM" == "hyprland" ]]; then
+        peazip_pkgs="peazip-common peazip-qt6"
+    else
+        # XFCE, GNOME, Niri, MangoWC, chadwm: lightweight/generic toolkits
+        peazip_pkgs="peazip-common peazip-gtk3"
+    fi
+    # shellcheck disable=SC2086
+    if ! install_packages $peazip_pkgs; then
+        color_red "  Failed: $peazip_pkgs"
+        color_red "  (continuing — PeaZip is a convenience, not a dependency)"
+    fi
 fi
 pause_if_debug