nvidia menu & management updates

- Refined `_show_nvidia_version_menu` in `modules/gpu/nvidia.sh` for Debian 12/13 with precise labels ("Newest Stable", "Kepler Support") and explicit official repo recommendations.
- Introduced new standalone module `modules/gpu/nvidia_manage.sh` integrated into the dispatcher to handle driver lifecycle management (Install/Change vs Remove) before version selection.
- Implemented safe removal logic (`_nvidia_remove`) with explicit package purging, explicitly excluding `firmware-misc-nonfree`, and cleaning specific configs/repos without wildcards.
- Ensured idempotency across all steps using `|| true` and preserved user CUDA toolkits while restoring Nouveau via initramfs regeneration.

modules/gpu.sh

@@ -5,6 +5,7 @@ _GPU_DIR="${MODULES_DIR}/gpu"
 source "${_GPU_DIR}/_helpers.sh"
 source "${_GPU_DIR}/amd_intel.sh"
 source "${_GPU_DIR}/nvidia.sh"
+source "${_GPU_DIR}/nvidia_manage.sh"
 
 # Consumed by gaming.sh to know which NVIDIA driver path was taken
 NVIDIA_DRIVER_MODE=""
@@ -193,6 +194,10 @@ _install_nvidia_stack() {
 
     NVIDIA_DRIVER_MODE=""
 
+    if ! _nvidia_manage_menu; then
+        return
+    fi
+
     if [ "$DEBIAN_VERSION" = "11" ]; then
         install_nvidia_bullseye
 

modules/gpu/nvidia.sh

@@ -195,14 +195,14 @@ _is_cuda_repo_ready() {
 _show_nvidia_version_menu() {
     local choice
     if [ "$DEBIAN_VERSION" = "12" ]; then
-        choice=$(_menu "NVIDIA Driver Version" "Select the NVIDIA driver version for Debian 12 (Bookworm):" 12 70 3 \
-            "535" "Official NVIDIA driver (Recommended)" \
-            "470" "Legacy 470 (Kepler/Tesla GPUs)")
+        choice=$(_menu "Select NVIDIA Driver for Debian 12 (Bookworm):" "Choose the NVIDIA driver version:" 12 70 3 \
+            "535" "v535 — Debian Official (Recommended)" \
+            "470" "v470 — Debian Legacy (Kepler Support)")
     elif [ "$DEBIAN_VERSION" = "13" ]; then
-        choice=$(_menu "NVIDIA Driver Version" "Select the NVIDIA driver version for Debian 13 (Trixie):" 14 70 5 \
-            "550" "Official Debian driver (Recommended)" \
-            "590" "NVIDIA Repo v590 (Turing/Ampere/Ada/Blackwell)" \
-            "595" "NVIDIA Repo v595 (Latest)")
+        choice=$(_menu "Select NVIDIA Driver for Debian 13 (Trixie):" "Choose the NVIDIA driver version:" 14 70 5 \
+            "550" "v550 — Debian Official (Recommended)" \
+            "590" "v590 — NVIDIA CUDA Repo (Production Branch)" \
+            "595" "v595 — NVIDIA CUDA Repo (Newest Stable)")
     else
         NVIDIA_SELECTED_VERSION="auto"
         return 0

modules/gpu/nvidia_manage.sh

@@ -0,0 +1,56 @@
+#!/usr/bin/env bash
+# nvidia_manage.sh — NVIDIA management menu: install/change or remove
+
+_nvidia_manage_menu() {
+    local choice
+    choice=$(_menu "NVIDIA Driver" "Manage NVIDIA Driver" 12 70 4 \
+        "1" "Install / Change NVIDIA Driver Version" \
+        "2" "Remove NVIDIA Driver and Restore Nouveau")
+
+    [ -z "$choice" ] && {
+        echo "Skipping NVIDIA installation."
+        return 1
+    }
+
+    case "$choice" in
+        2)
+            _nvidia_remove
+            return 1
+            ;;
+        *) return 0 ;;
+    esac
+}
+
+_nvidia_remove() {
+    if ! dpkg -l 2>/dev/null | grep -qE "^ii  (nvidia-driver|nvidia-tesla-470-driver|nvidia-open-kernel-dkms|nvidia-kernel-dkms)"; then
+        echo -e "${YELLOW}NVIDIA driver is not installed on this system.${NC}"
+        return 0
+    fi
+
+    if ! _confirm "Remove NVIDIA" "This will:\n  - Purge the NVIDIA driver packages\n  - Remove script-generated configs\n  - Remove the CUDA repo sources\n  - Regenerate initramfs\n\nProceed?"; then
+        echo "NVIDIA removal cancelled."
+        return 0
+    fi
+
+    echo "Removing NVIDIA driver packages..."
+    sudo apt purge -y nvidia-driver nvidia-kernel-dkms nvidia-open-kernel-dkms nvidia-tesla-470-driver nvidia-settings nvidia-vaapi-driver firmware-nvidia-gsp mesa-vdpau-drivers || true
+
+    echo "Cleaning up dependencies..."
+    sudo apt autoremove --purge -y || true
+
+    echo "Removing script-generated configuration..."
+    sudo rm -f /etc/modprobe.d/nvidia-wayland.conf || true
+    sudo rm -f /etc/modprobe.d/nvidia-open.conf || true
+    sudo rm -f /etc/apt/preferences.d/block-nvidia || true
+    sudo rm -f /etc/X11/xorg.conf.d/20-nvidia.conf || true
+
+    echo "Removing NVIDIA repository sources..."
+    sudo rm -f /etc/apt/sources.list.d/cuda-*.list || true
+    sudo rm -f /etc/apt/sources.list.d/extrepo_nvidia-cuda.sources || true
+
+    echo "Regenerating initramfs..."
+    sudo update-initramfs -u || true
+
+    echo -e "${GREEN}NVIDIA driver removed. Please reboot your system.${NC}"
+    return 0
+}