Add rolling 4-line progress preview to install.sh

Long-running apt commands now show a live 4-line preview window that
overwrites in place using terminal escape codes. Users see what's
happening without the screen flooding with package manager output.
Preview auto-clears when each step completes.

Also fixes: duplicate else branch in Docker if/else block,
adds DEBIAN_FRONTEND=noninteractive and --force-confold to prevent
interactive dpkg prompts (sshd_config, etc).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

install.sh

@@ -5,6 +5,32 @@ set -eo pipefail
 # Bootstrap script: installs Docker, clones repo, runs setup wizard
 # Usage: curl -fsSL <url>/install.sh | bash
 
+# --- Rolling preview helper ---
+# Shows last 4 lines of output in-place, then clears when done.
+# Keeps the terminal clean while still showing live progress.
+show_progress() {
+    local n=4 buffer=() count=0
+    while IFS= read -r line; do
+        buffer+=("$line")
+        (( count++ )) || true
+        if [ ${#buffer[@]} -gt $n ]; then
+            buffer=("${buffer[@]:1}")
+        fi
+        if [ $count -gt 1 ]; then
+            printf '\033[%dA' "${#buffer[@]}" 2>/dev/null || true
+        fi
+        for l in "${buffer[@]}"; do
+            printf '\033[2K    %.60s\n' "$l"
+        done
+    done
+    # clear preview lines when done
+    if [ ${#buffer[@]} -gt 0 ]; then
+        printf '\033[%dA' "${#buffer[@]}" 2>/dev/null || true
+        for _ in "${buffer[@]}"; do printf '\033[2K\n'; done
+        printf '\033[%dA' "${#buffer[@]}" 2>/dev/null || true
+    fi
+}
+
 echo ""
 echo "═══════════════════════════════════════════════════════════"
 echo "  WebsiteBox Installer"
@@ -75,13 +101,13 @@ echo "Updating system packages..."
 echo "  Downloading the latest security patches for your operating system."
 echo "  On a fresh server this can take 2-10 minutes. Sit tight."
 $SUDO apt-get update -qq
-$SUDO apt-get upgrade -y -qq -o Dpkg::Options::="--force-confold"
+DEBIAN_FRONTEND=noninteractive $SUDO apt-get upgrade -y -o Dpkg::Options::="--force-confold" 2>&1 | show_progress
 echo "System packages updated."
 
 # Install firewall, fail2ban, and automatic updates
 echo "Installing security tools (firewall, fail2ban, auto-updates)..."
 echo "  These protect your server from common attacks. Usually under a minute."
-$SUDO apt-get install -y -qq ufw fail2ban unattended-upgrades
+DEBIAN_FRONTEND=noninteractive $SUDO apt-get install -y ufw fail2ban unattended-upgrades 2>&1 | show_progress
 
 # Configure firewall — allow SSH first to avoid lockout
 if ! $SUDO ufw status | grep -q "Status: active"; then
@@ -148,6 +174,10 @@ DOCKER_JUST_INSTALLED=false
 
 if command -v docker &>/dev/null; then
     echo "Docker is already installed."
+    # Restart to pick up daemon.json if it was just created
+    if [ -f /etc/docker/daemon.json ]; then
+        $SUDO systemctl restart docker 2>/dev/null || true
+    fi
 else
     echo "Installing Docker..."
     echo "  Docker packages and runs your website in isolated containers."
@@ -155,7 +185,7 @@ else
 
     # Install prerequisites
     $SUDO apt-get update -qq
-    $SUDO apt-get install -y -qq ca-certificates curl gnupg lsb-release
+    DEBIAN_FRONTEND=noninteractive $SUDO apt-get install -y ca-certificates curl gnupg lsb-release 2>&1 | show_progress
 
     # Add Docker's GPG key
     $SUDO install -m 0755 -d /etc/apt/keyrings
@@ -170,7 +200,7 @@ else
 
     # Install Docker
     $SUDO apt-get update -qq
-    $SUDO apt-get install -y -qq docker-ce docker-ce-cli containerd.io docker-compose-plugin
+    DEBIAN_FRONTEND=noninteractive $SUDO apt-get install -y docker-ce docker-ce-cli containerd.io docker-compose-plugin 2>&1 | show_progress
 
     # Add user to docker group
     if [ "$ACTUAL_USER" != "root" ]; then
@@ -184,11 +214,6 @@ else
     $SUDO systemctl enable docker
 
     echo "Docker installation complete."
-else
-    # Docker exists — restart to pick up daemon.json if it was just created
-    if [ -f /etc/docker/daemon.json ]; then
-        $SUDO systemctl restart docker 2>/dev/null || true
-    fi
 fi
 
 # --- Clone Repository ---