feat: added PWA support

app.py

@@ -30,7 +30,7 @@ APP_PASSWORD = os.environ.get("PASSWORD", "")
 def require_login():
     if not APP_PASSWORD:
         return
-    if request.endpoint in ("login", "static"):
+    if request.endpoint in ("login", "static", "service_worker", "offline"):
         return
     if not session.get("authenticated"):
         if request.path.startswith("/api/"):
@@ -170,6 +170,16 @@ def run_download(job_id: str, urls: list[str], options: dict):
             jobs[job_id]["output"] = jobs[job_id].get("output", []) + [str(e)]
 
 
+@app.route("/sw.js")
+def service_worker():
+    return send_from_directory("static", "sw.js", mimetype="application/javascript")
+
+
+@app.route("/offline")
+def offline():
+    return send_from_directory("static", "offline.html")
+
+
 @app.route("/login", methods=["GET", "POST"])
 def login():
     if request.method == "POST":