feat(tui): add layout utilities for terminal UI formatting

Prepare for future TUI modifications

scripts/tui/layout.sh

@@ -0,0 +1,50 @@
+# tui/layout.sh
+# Terminal UI layout helpers
+# Provides menu/table formatting utilities
+
+
+# set the total width of the menu
+# (adjusting this number will automatically change the entire menu, including the separator lines)
+# note: The number represents the number of columns that appear when the "||" appears on the right
+TABLE_WIDTH=60
+
+# define two extra-long template strings in advance
+# (the length should be greater than the expected TABLE_WIDTH)
+FULL_EQ="===================================================================================================="
+FULL_DASH="- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "
+
+# function to print content lines
+# (using cursor jump)
+content_line() {
+    echo -e " ${1}\033[${TABLE_WIDTH}G||"
+}
+
+# function to print sub content lines
+# for printing accompanying instructions
+sub_content_line() {
+    echo -e "    ${1}\033[${TABLE_WIDTH}G||"
+    content_line
+}
+
+# increase the spacing between the front
+# and back forms to improve readability
+double_line_break() {
+    printf "\n\n"
+}
+
+# function to print separators
+# (using string slicing)
+# parameter $1: pass in "=" or "-"
+separator_line() {
+    local separator_type="$1"
+    local output_line=""
+    local len=$((TABLE_WIDTH - 1))
+
+    if [ "$separator_type" == "=" ]; then
+        output_line="${FULL_EQ:0:$len}"
+    else
+        output_line="${FULL_DASH:0:$len}"
+    fi
+
+    echo "${output_line}||"
+}