Remove duplicate show_progress function

QA scan found duplicate show_progress function in analyze-historical-attacks.sh
that's already available in lib/common-functions.sh.

Changes:
- Added source for lib/common-functions.sh
- Removed local show_progress() definition
- Added comment noting function is now sourced

This reduces code duplication and ensures consistent progress display
across all toolkit scripts.

tools/analyze-historical-attacks.sh

@@ -25,6 +25,10 @@
 SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)/.."
 
 # Source required libraries
+source "$SCRIPT_DIR/lib/common-functions.sh" 2>/dev/null || {
+    echo "ERROR: common-functions.sh not found"
+    exit 1
+}
 source "$SCRIPT_DIR/lib/attack-signatures.sh" 2>/dev/null || {
     echo "ERROR: attack-signatures.sh not found"
     exit 1
@@ -167,17 +171,7 @@ declare -A IP_SAMPLE_URLS     # Sample URLs per IP
 declare -a ATTACK_TYPES_RAW
 declare -a SIGNATURE_HITS_RAW
 
-# Progress indicator
-show_progress() {
-    count=$1
-    total=$2
-    if [ "$total" = "unknown" ] || [ "$total" -eq 0 ] 2>/dev/null; then
-        echo -ne "\r${BLUE}[*]${NC} Processing: $count lines... "
-    else
-        percent=$((count * 100 / total))
-        echo -ne "\r${BLUE}[*]${NC} Processing: $count/$total lines ($percent%) "
-    fi
-}
+# Progress indicator function now sourced from common-functions.sh
 
 # Start analysis
 echo ""