zram menu refactor, mesa fix & sysinfo ui

- Refactored `install_zram` into a dedicated submenu (`zram_menu`) within `modules/zram.sh`. Split monolithic logic into three distinct operations: `_zram_view`, `_zram_create`, and `_zram_remove`. Enables status verification before installation and safe cleanup. Updated main menu entry in `debianito.sh` to call the new sub-menu.
- Resolved Trixie backports dependency conflicts between `mesa-libgallium` and `mesa-va-drivers` (Mesa 26+). Modified package lists in `_helpers.sh` and `gpu.sh` to exclude `mesa-va-drivers` during backports installs, prioritizing `mesa-vulkan-drivers` for stable Gallium integration.
- Implemented dynamic dimensioning in `_show_sysinfo()`. Calculates optimal width/height based on terminal size (`tput cols`) and content length. Truncates long lines to prevent UI overflow in small terminals, capped at 22-line height.

modules/zram.sh

@@ -1,14 +1,90 @@
 #!/usr/bin/env bash
-# zram.sh - Configure compressed swap in RAM
+# zram.sh — ZRAM submenu: view, create/reconfigure, remove
 
-install_zram() {
-    echo -e "${YELLOW}ZRAM Configuration${NC}"
+zram_menu() {
+    while true; do
+        local choice
+        choice=$(_menu "ZRAM Configuration" \
+            "Select an operation:" $TUI_ALTO $TUI_ANCHO 4 \
+            "1" "View ZRAM status" \
+            "2" "Create / Reconfigure ZRAM" \
+            "3" "Remove ZRAM" \
+            "4" "Back to main menu")
 
+        [ -z "$choice" ] && break
+        clear
+
+        case "$choice" in
+            1) _zram_view ;;
+            2) _zram_create ;;
+            3) _zram_remove ;;
+            4) break ;;
+        esac
+    done
+}
+
+_zram_view() {
+    if ! is_installed "zram-tools"; then
+        _msg "ZRAM Status" "ZRAM is not installed.\n\nUse option 2 (Create / Reconfigure ZRAM)\nto set it up." 10 55
+        return
+    fi
+
+    local algo="" size="" priority=""
+    if [ -f /etc/default/zramswap ]; then
+        while IFS='=' read -r key val; do
+            case "$key" in
+                ALGO)      algo=$val ;;
+                SIZE)      size=$val ;;
+                PRIORITY)  priority=$val ;;
+            esac
+        done < /etc/default/zramswap
+    fi
+
+    local info="ZRAM Configuration:\n"
+    info+="  Algorithm:  ${algo:-not set}\n"
+    info+="  Size:       ${size:-not set} MB\n"
+    info+="  Priority:   ${priority:-not set}\n\n"
+    info+="Active ZRAM devices:\n"
+
+    local zram_out
+    zram_out=$(sudo zramctl 2>/dev/null || true)
+    if [ -n "$zram_out" ]; then
+        info+="$zram_out"
+    else
+        info+="  (none — service may be stopped)"
+    fi
+
+    _msg "ZRAM Status" "$info" 16 70
+}
+
+_zram_create() {
     if [ -z "$RAM_KB" ] || [ "$RAM_KB" -eq 0 ]; then
         echo -e "${RED}Could not determine RAM size. Aborting.${NC}"
         return 1
     fi
 
+    if is_installed "zram-tools"; then
+        local cur_algo="" cur_size="" cur_prio=""
+        if [ -f /etc/default/zramswap ]; then
+            while IFS='=' read -r key val; do
+                case "$key" in
+                    ALGO)     cur_algo=$val ;;
+                    SIZE)     cur_size=$val ;;
+                    PRIORITY) cur_prio=$val ;;
+                esac
+            done < /etc/default/zramswap
+        fi
+        local cur="ZRAM is already configured:\n"
+        cur+="  Algorithm:  ${cur_algo:-not set}\n"
+        cur+="  Size:       ${cur_size:-not set} MB\n"
+        cur+="  Priority:   ${cur_prio:-not set}\n\n"
+        cur+="Continuing will overwrite this configuration."
+        if ! _confirm "ZRAM — Reconfigure" "$cur"; then
+            echo "ZRAM reconfiguration cancelled."
+            return
+        fi
+    fi
+
     local half_ram_mb=$(( ((RAM_KB / 1024 / 1024 + 1) / 2) * 1024 ))
 
     local algo
@@ -20,7 +96,7 @@ install_zram() {
 
     if [ -z "$algo" ]; then
         echo "ZRAM configuration cancelled."
-        return 0
+        return
     fi
 
     local zram_size
@@ -30,13 +106,13 @@ install_zram() {
         zram_size=$(_inputbox "ZRAM Size" "Enter ZRAM size in MB:" 8 60 "$half_ram_mb")
         if [ -z "$zram_size" ] || ! [[ "$zram_size" =~ ^[0-9]+$ ]] || [ "$zram_size" -eq 0 ]; then
             echo "ZRAM configuration cancelled."
-            return 0
+            return
         fi
     fi
 
     if ! _confirm "ZRAM Summary" "Algorithm: ${algo}\nSize: ${zram_size} MB\nPriority: 100\n\nApply?"; then
         echo "ZRAM configuration cancelled."
-        return 0
+        return
     fi
 
     _run_cmd "ZRAM" "sudo apt install -y zram-tools" "Installing zram-tools..."
@@ -59,3 +135,26 @@ EOF
     echo -e "${GREEN}You can verify with: sudo zramctl${NC}"
     _pause
 }
+
+_zram_remove() {
+    if ! is_installed "zram-tools"; then
+        _msg "ZRAM Remove" "ZRAM is not installed.\n\nNothing to remove." 10 50
+        return
+    fi
+
+    if ! _confirm "Remove ZRAM" \
+        "This will:\n  - Stop the zramswap service\n  - Purge zram-tools\n  - Remove /etc/default/zramswap\n\nProceed?"; then
+        echo "ZRAM removal cancelled."
+        return
+    fi
+
+    echo "Stopping zramswap service..."
+    sudo systemctl stop zramswap || true
+
+    _run_cmd "ZRAM" "sudo apt purge -y zram-tools" "Purging zram-tools..."
+
+    echo "Removing configuration..."
+    sudo rm -f /etc/default/zramswap
+
+    _msg "ZRAM Removed" "ZRAM has been removed successfully.\n\nThe zramswap service is stopped and disabled." 10 55
+}