fix: paru-bin (pre-compiled) statt paru aus Source bauen

Alter Code:
- paru aus Source (braucht rustup + rust compiler → langsam + Fehleranfällig)
- 2>/dev/null + 2>&1 | tail -5 versteckte ALLE Fehler
- makepkg als root ausgeführt → schlägt fehl (makepkg verweigert root)
- yay als zweiter Versuch hatte die selben Probleme

Neuer Code:
- paru-bin (pre-compiled binary, kein Rust nötig)
- KEINE stderr-Unterdrückung mehr → Fehler sichtbar
- is_root()-Check: klare Warnung + Anleitung falls als root ausgeführt
- yay-bin als Fallback falls paru-bin scheitert

lib/utils.sh

@@ -267,29 +267,48 @@ install_aur_helper() {
     return 0
   fi
 
-  if ! command -v git >/dev/null 2>&1; then
-    sudo_run pacman -S --needed --noconfirm git base-devel
+  if is_root; then
+    tui_warn "Running as root — makepkg refuses to run as root."
+    tui_info "Switch to a normal user with sudo access and re-run, or install paru manually:"
+    tui_info "  pacman -S --needed git && git clone https://aur.archlinux.org/paru-bin.git"
+    tui_info "  cd paru-bin && makepkg -si"
+    return 1
   fi
 
+  command -v git >/dev/null 2>&1 || sudo_run pacman -S --needed --noconfirm git
+
   local build_dir
   build_dir="$(mktemp -d)"
 
-  sudo_run pacman -S --needed --noconfirm rustup 2>/dev/null || true
-
-  if have rustup; then
-    rustup default stable >/dev/null 2>&1 || true
+  tui_info "Downloading paru-bin from AUR..."
+  if ! git clone https://aur.archlinux.org/paru-bin.git "$build_dir/paru-bin"; then
+    tui_error "Failed to download paru-bin. Check network connectivity."
+    rm -rf "$build_dir"
+    return 1
   fi
 
-  if git clone https://aur.archlinux.org/paru.git "$build_dir/paru" 2>/dev/null; then
-    (cd "$build_dir/paru" && makepkg -si --needed --noconfirm) 2>&1 | tail -5 || {
-      tui_warn "paru build failed, trying yay..."
-      if git clone https://aur.archlinux.org/yay.git "$build_dir/yay" 2>/dev/null; then
-        (cd "$build_dir/yay" && makepkg -si --needed --noconfirm) 2>&1 | tail -5 || {
-          tui_warn "yay build failed too. Install manually: paru -S paru-bin"
-        }
-      fi
-    }
+  tui_info "Building paru-bin with makepkg..."
+  if (cd "$build_dir/paru-bin" && makepkg -si --needed --noconfirm); then
+    tui_success "paru installed successfully"
+    rm -rf "$build_dir"
+    return 0
   fi
 
+  local rc=$?
+  tui_warn "makepkg failed (exit $rc). Trying yay-bin..."
+  rm -rf "$build_dir/paru-bin"
+
+  if git clone https://aur.archlinux.org/yay-bin.git "$build_dir/yay-bin"; then
+    if (cd "$build_dir/yay-bin" && makepkg -si --needed --noconfirm); then
+      tui_success "yay installed successfully"
+      rm -rf "$build_dir"
+      return 0
+    fi
+  fi
+
+  tui_warn "Could not install AUR helper. Install manually:"
+  tui_info "  cd /tmp && git clone https://aur.archlinux.org/paru-bin.git"
+  tui_info "  cd paru-bin && makepkg -si"
   rm -rf "$build_dir"
+  return 1
 }