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.

debianito.sh

@@ -46,8 +46,8 @@ DEBIAN_CODENAME=""
 main_menu() {
     # Auto-adjust TUI dimensions for small terminals
     if [ "${LINES:-24}" -lt $((TUI_ALTO + 6)) ] || [ "${COLUMNS:-80}" -lt $((TUI_ANCHO + 6)) ]; then
-        TUI_ALTO=$((LINES - 4 > 8 ? LINES - 4 : 8))
-        TUI_ANCHO=$((COLUMNS - 4 > 50 ? COLUMNS - 4 : 50))
+        TUI_ALTO=$(( ${LINES:-24} - 4 > 8 ? ${LINES:-24} - 4 : 8))
+        TUI_ANCHO=$(( ${COLUMNS:-80} - 4 > 50 ? ${COLUMNS:-80} - 4 : 50))
         TUI_ALTO_LISTA=$((TUI_ALTO - 10 > 4 ? TUI_ALTO - 10 : 4))
     fi