amd gcn legacy support & kernel overhaul

- Fixed Mesa 32-bit dependency conflicts by removing mesa-va-drivers from gaming setup; mesa-libgallium now includes VA-API for Mesa >= 25.3.3, resolving solver errors with backports (Mesa 26.x).
- Removed corectrl detection and installation from AMD tools in gpu/amd_intel.sh (retained in System Tools checklist only).
- Added zutty terminal emulator option alongside alacritty for Debian 12+ in terminals.sh.
- Overhauled Kernel menu: replaced "Backports Kernel" with "Kernel" submenu offering Stable, RT, Cloud, and Backports options; removed hardcoded Debian 11 restriction (backports hidden only on Bullseye); headers now installed automatically with all kernel variants; NVIDIA warnings added for Backports (DKMS required) and RT (driver compatibility note).
- Implemented AMD GCN legacy driver migration: is_amd_legacy_gcn() function detects GCN 1.0/1.1 GPUs via whitelist of 85 PCI IDs; offers user prompt to force amdgpu module with GRUB parameters (radeon.si_support=0, radeon.cik_support=0, amdgpu.si_support=1, amdgpu.cik_support=1); safe sed-based injection into GRUB_CMDLINE_LINUX_DEFAULT with backup and idempotency check.
- Standardized UI across 27 checklist locations: unified text to "Check [*] the packages you want installed/updated on your system."; removed SCROLL_HINT variable entirely from all code; changed OK button to "Apply" in _checklist() and _inputbox() only (not in _msg/_menu).
- Reordered gaming menu checklists: i386 moved to top position, steam/mangohud positioned immediately after for better dependency flow.
- Enhanced kernel installation prompts: all variants (Stable, RT, Cloud, Backports) now display candidate version numbers in parentheses using apt-cache policy and madison queries.
- update readme

modules/desktop_display.sh

@@ -115,7 +115,7 @@ configure_greetd() {
         fi
         local choice
         choice=$(_menu "greetd Configuration" \
-            "Select an option${SCROLL_HINT}:" \
+            "Select an option:" \
             $TUI_ALTO $TUI_ANCHO $TUI_ALTO_LISTA \
             "${gd_items[@]}")
         [ -z "$choice" ] && return
@@ -179,7 +179,7 @@ configure_gdm3() {
         fi
         local choice
         choice=$(_checklist "GDM3 Configuration" \
-            "Select options to apply${SCROLL_HINT}:" \
+            "Select options to apply:" \
             $TUI_ALTO $TUI_ANCHO $TUI_ALTO_LISTA \
             "${items_enabled[@]}")
         [ -z "$choice" ] && return
@@ -243,7 +243,7 @@ configure_sddm() {
     while true; do
         local choice
         choice=$(_menu "SDDM Configuration" \
-            "Select an option${SCROLL_HINT}:" \
+            "Select an option:" \
             $TUI_ALTO $TUI_ANCHO $TUI_ALTO_LISTA \
             "1" "Install SDDM (Set as default)" \
             "2" "Enable Autologin" \