fix(installer): resolve disko evaluation crash and infinite loops

- Fix disko-config.nix signature by adding '...' to handle unexpected CLI arguments.
- Update disko mode to 'destroy,format,mount' for the modern API and to avoid deprecation warnings.
- Fix infinite loops in 'configure_impermanence' and 'confirm_form_factor' caused by misinterpreting 'No' (rc=1) as an abort.

installer/install.sh

@@ -841,7 +841,7 @@ confirm_form_factor() {
     if [[ $rc -eq 0 ]]; then
         FORM_FACTOR="$default"
     else
-        if [[ $rc -eq 130 || $rc -eq 1 ]]; then return 130; fi
+        if [[ $rc -eq 130 ]]; then return 130; fi
         FORM_FACTOR=$([[ "$default" == "laptop" ]] && echo desktop || echo laptop)
     fi
     success "Form factor: $FORM_FACTOR"
@@ -875,7 +875,8 @@ configure_impermanence() {
         ENABLE_IMPERMANENCE="true"
         success "Impermanence enabled"
     else
-        if [[ $rc -eq 130 || $rc -eq 1 ]]; then return 130; fi
+        if [[ $rc -eq 130 ]]; then return 130; fi
+        ENABLE_IMPERMANENCE="false"
         info "Impermanence disabled (traditional persistent root)"
     fi
     save_state
@@ -1093,7 +1094,7 @@ run_disko_with_retry() {
     while true; do
         local rc=0
         set +e
-        disko --mode disko \
+        disko --mode destroy,format,mount \
               --argstr mainDrive "$main_drive" \
               --arg    extraDrives "$extras_nix" \
               "$disko_file" 2>&1 | tee "$log"