Initial import: web4beginners editor and deployment setup

serve-offline.sh

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+#!/usr/bin/env bash
+set -euo pipefail
+
+ROOT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+cd "$ROOT_DIR"
+
+PORT="${1:-4173}"
+PID_FILE=".offline-server.pid"
+LOG_FILE=".offline-server.log"
+
+if [[ -f "$PID_FILE" ]] && kill -0 "$(cat "$PID_FILE")" 2>/dev/null; then
+  echo "Offline server already running on PID $(cat "$PID_FILE")."
+  echo "Open: http://127.0.0.1:${PORT}/"
+  exit 0
+fi
+
+rm -f "$PID_FILE"
+
+ln -sf web4beginners.com.html index.html
+nohup python3 -m http.server "$PORT" --bind 127.0.0.1 >"$LOG_FILE" 2>&1 &
+SERVER_PID=$!
+echo "$SERVER_PID" > "$PID_FILE"
+
+sleep 0.3
+if ! kill -0 "$SERVER_PID" 2>/dev/null; then
+  echo "Failed to start offline server on port $PORT."
+  echo "Check log: $ROOT_DIR/$LOG_FILE"
+  rm -f "$PID_FILE"
+  exit 1
+fi
+
+echo "Offline server started (PID $SERVER_PID)."
+echo "Open: http://127.0.0.1:${PORT}/"
+echo "Log: $ROOT_DIR/$LOG_FILE"