UX Refactor: Pauses, Status & WiFi

- Implemented global `_pause()` logic across all modules (`utils`, `gaming`, `firmware`, etc.), replacing hardcoded `read -p` calls to standardize exit pauses.
- Unified MangoHud installation into a single command (`apt install -y mangohud:i386`) for gaming and legacy branches.
- Refactored `_inst()` to return `*` instead of `(installed)`, moving the function globally to `utils.sh` and removing duplicates from helpers.
- Enhanced Broadcom WiFi detection with expanded grep patterns ('network controller', 'wireless', etc.) and ID fallback (`14e4`).
- Updated `_run_cmd` to integrate the new pause logic for consistent workflow interruptions during script execution.

modules/extras/_helpers.sh

@@ -1,14 +1,6 @@
 #!/usr/bin/env bash
 # Shared helpers for extras categories
 
-_inst() {
-    if is_installed "$1"; then echo " (installed)"; else echo ""; fi
-}
-
-_state() {
-    is_installed "$1" && echo "ON" || echo "OFF"
-}
-
 _install_clamav() {
     if is_installed "clamav"; then
         echo "ClamAV already installed."
@@ -21,6 +13,7 @@ _install_clamav() {
         sudo systemctl stop clamav-freshclam 2>/dev/null || true
         sudo freshclam || true
         sudo systemctl start clamav-freshclam 2>/dev/null || true
+        _pause
     fi
 
     if _confirm "ClamAV" "Run quick scan on /bin to verify engine works?"; then