fix harden hardware detection D3cold freezes

Fixes a critical startup crash on hybrid graphics laptops (e.g., Intel + Nvidia) running fresh Debian installs without proprietary drivers. 

When the secondary GPU enters D3cold power state, kernel-level I/O operations (like `lspci` or reading `/sys/block/`) hang in Uninterruptible Sleep (State D), ignoring standard kill signals and freezing the terminal. Combined with `set -euo pipefail`, these hangs made the script silently fail or enter infinite loops.

Changes:
- Timeout Wrappers: Wrapped all hardware probing commands (`lspci`, `lsblk`, `cat /sys/...`, `ip`, `iwgetid`, `pw-cli`) with `timeout 2` to force-continue if the kernel blocks.
- Pipeline Safety: Added `|| true` to `nvidia-smi` and `dpkg` fallback queries to prevent `pipefail` from killing the script when drivers are missing.
- Loop Hardening: Fixed an infinite loop in `detect_gpu()` where empty `lspci` outputs caused by timeouts would loop forever by adding `[[ -z "$line" ]] && continue`.
- TUI Fallbacks: Added default values for `${LINES:-24}` and `${COLUMNS:-80}` to prevent `set -u` from crashing the `whiptail` menu in restricted shell environments.

modules/sysinfo.sh

@@ -112,7 +112,7 @@ _show_sysinfo() {
                 lo|docker*|veth*|br-*|virbr*|tun*|tap*|bond*) continue ;;
             esac
 
-            ip4=$(ip -4 -o addr show "$iface" 2>/dev/null | awk '{print $4}')
+            ip4=$(timeout 2 ip -4 -o addr show "$iface" 2>/dev/null | awk '{print $4}')
 
             # Determine type by PCI class (most reliable)
             local pci_class=""
@@ -129,7 +129,7 @@ _show_sysinfo() {
                     desc="${wifi_descs[0]:-Unknown WiFi chipset}"
                     shown_wifi_descs+=("${wifi_descs[0]}")
                     ssid=""
-                    [ "$state" = "UP" ] && ssid=$(iwgetid -r "$iface" 2>/dev/null || true)
+                    [ "$state" = "UP" ] && ssid=$(timeout 2 iwgetid -r "$iface" 2>/dev/null || true)
                     ;;
                 *)
                     # Fallback: classify by interface name pattern
@@ -139,7 +139,7 @@ _show_sysinfo() {
                             desc="${wifi_descs[0]:-Unknown WiFi chipset}"
                             shown_wifi_descs+=("${wifi_descs[0]}")
                             ssid=""
-                            [ "$state" = "UP" ] && ssid=$(iwgetid -r "$iface" 2>/dev/null || true)
+                            [ "$state" = "UP" ] && ssid=$(timeout 2 iwgetid -r "$iface" 2>/dev/null || true)
                             ;;
                         eth*|enp*|ens*|enx*|eno*)
                             has_eth=true
@@ -163,7 +163,7 @@ _show_sysinfo() {
             else
                 msg+="${iface}:   ${desc}\n       ↓\n"
             fi
-        done < <(ip -o link show 2>/dev/null)
+        done < <(timeout 2 ip -o link show 2>/dev/null)
     fi
 
     # ── 5. Show chipsets without an active interface ──