Fix ClamAV progress display to only update on file change

Problem:
Progress display updated every 0.2s showing same filename repeatedly:
  Scanning... ⠹ | Last file: pickledperil.com-Dec-2025.gz | Elapsed: 1m
  Scanning... ⠸ | Last file: pickledperil.com-Dec-2025.gz | Elapsed: 1m
  Scanning... ⠼ | Last file: pickledperil.com-Dec-2025.gz | Elapsed: 1m

This created spam and made it hard to see actual progress.

Solution:
Track last displayed filename and only update when it changes:
- Added last_filename variable
- Only printf when filename != last_filename
- Removed spinner animation (unnecessary with file tracking)
- Changed format to simpler: "Scanning: [filename] | Elapsed: [time]"

Now displays:
  Scanning: pickledperil.com-Dec-2025.gz | Elapsed: 1m
  Scanning: awstats122025.pickledperil.com.txt | Elapsed: 1m 5s
  Scanning: error.log | Elapsed: 1m 10s

Each line shows a new file being scanned, no repetition.

modules/security/malware-scanner.sh

@@ -967,8 +967,7 @@ for scanner in "${AVAILABLE_SCANNERS[@]}"; do
 
             # Monitor activity by watching log file growth
             last_size=0
-            spin_chars='⠋⠙⠹⠸⠼⠴⠦⠧⠇⠏'
-            spin_index=0
+            last_filename=""
             stall_counter=0
 
             while kill -0 $CLAM_PID 2>/dev/null; do
@@ -980,14 +979,14 @@ for scanner in "${AVAILABLE_SCANNERS[@]}"; do
                     current_file=$(tail -1 "$LOG_DIR/clamav.log" 2>/dev/null | grep -o '/[^:]*' | head -1)
                     if [ -n "$current_file" ]; then
                         filename=$(basename "$current_file" 2>/dev/null || echo "...")
+
+                        # Only update display when filename changes
+                        if [ "$filename" != "$last_filename" ]; then
                             elapsed=$(($(date +%s) - SCAN_START))
-                        spin_char="${spin_chars:$spin_index:1}"
-                        printf "\r  Scanning... %s | Last file: %s | Elapsed: %s  " \
-                            "$spin_char" "${filename:0:40}" "$(format_time $elapsed)"
-                    else
-                        elapsed=$(($(date +%s) - SCAN_START))
-                        spin_char="${spin_chars:$spin_index:1}"
-                        printf "\r  Scanning... %s | Elapsed: %s  " "$spin_char" "$(format_time $elapsed)"
+                            printf "\r  Scanning: %s | Elapsed: %s  " \
+                                "${filename:0:50}" "$(format_time $elapsed)"
+                            last_filename="$filename"
+                        fi
                     fi
 
                     # Check for stalled scan (no log growth in 60 seconds)
@@ -1002,7 +1001,6 @@ for scanner in "${AVAILABLE_SCANNERS[@]}"; do
                     last_size=$current_size
                 fi
 
-                spin_index=$(( (spin_index + 1) % 10 ))
                 sleep 0.2
             done