feat: paru auto-install + ASCII Header + Continue-Prompt

- paru wird jetzt in detect_environment() auf frischen Systemen installiert
  (vorher nur in preflight, das bei --fresh nie durchlief)
- install_aur_helper() von preflight nach utils.sh verschoben (global verfügbar)
- Header von Cherokee-Zeichen ('Ꮎ Ꮇ Ꭼ Ꮢ Ꮎ Ꮑ') auf ASCII ('O M E R O N')
  umgestellt — Cherokee zeigte auf manchen Terminals Fragezeichen
- Continue with installation? Prompt nach Banner als erster interaktiver Schritt
- basic mode header jetzt sauberes ASCII (===== statt Box-Zeichen)

install.sh

@@ -99,7 +99,7 @@ detect_environment() {
 
   if ((!OMERON_HAS_GUM)) && have pacman; then
     printf '\033[1;36m━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━\033[0m\n'
-    printf '\033[1;36m  Ꮎ Ꮇ Ꭼ Ꮢ Ꮎ Ꮑ  —  Modular System Setup Framework\033[0m\n'
+    printf '\033[1;36m  O M E R O N  —  Modular System Setup Framework\033[0m\n'
     printf '\033[1;36m━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━\033[0m\n'
     printf '\n'
     printf '  \033[1;33mgum is not installed.\033[0m Installing it enables the full TUI experience.\n'
@@ -125,8 +125,13 @@ detect_environment() {
     fi
   fi
 
-  if ((OMERON_FRESH_INSTALL)) && ((!OMERON_HAS_GUM)) && have pacman; then
-    tui_install_gum 2>/dev/null || true
+  if ((OMERON_FRESH_INSTALL)); then
+    if ((!OMERON_HAS_GUM)) && have pacman; then
+      tui_install_gum 2>/dev/null || true
+    fi
+    if ! have paru && ! have yay; then
+      install_aur_helper
+    fi
   fi
 }
 
@@ -203,14 +208,10 @@ collect_all_interactive() {
 }
 
 show_banner() {
-  tui_header " Ꮎ Ꮇ Ꭼ Ꮢ Ꮎ Ꮑ "
-  tui_info "Modular System Setup Framework"
-  tui_info "Arch / Hyprland / CachyOS"
+  tui_header "O M E R O N  —  Modular System Setup"
   printf '\n'
-
   if ((OMERON_FRESH_INSTALL)); then
-    tui_warn "FRESH INSTALL MODE"
-    tui_info "Will install Hyprland, GPU drivers, and all dependencies."
+    tui_info "Fresh install: Hyprland + GPU drivers + all dependencies"
     printf '\n'
   fi
 }
@@ -230,6 +231,14 @@ main() {
 
   show_banner
 
+  tui_separator
+  printf '\n'
+  if ! tui_confirm "Continue with installation"; then
+    tui_info "Installation cancelled."
+    exit 0
+  fi
+  printf '\n'
+
   local modules_to_run=()
   if ((${#RUN_MODULES[@]})); then
     mapfile -t modules_to_run < <(collect_modules)
@@ -268,7 +277,7 @@ main() {
   done
 
   printf '\n'
-  tui_header " Ꮎ Ꮇ Ꭼ Ꮢ Ꮎ Ꮑ "
+  tui_header "O M E R O N  —  Done"
   tui_success "Installation Complete!"
   printf '\n'
   tui_info "Log: ${OMERON_LOG_FILE}"