feat: add service worker route with cache-control headers and update PWA manifest icons for proper maskable support

Add /sw.js route with send_from_directory to serve service worker from root scope with Service-Worker-Allowed:/ and Cache-Control:no-cache headers. Add navigator.serviceWorker.register() script to index.html with load event listener and scope:/ parameter. Update service worker cache to v4 with media-mark-192.svg/media-mark-512.svg additions to SHELL array.

Update manifest.json icons

app.py

@@ -13,7 +13,7 @@ from datetime import datetime
 from pathlib import Path
 
 import requests
-from flask import Flask, jsonify, render_template, request
+from flask import Flask, jsonify, render_template, request, send_from_directory
 
 RADARR_URL = os.environ.get("RADARR_URL", "http://radarr:7878").rstrip("/")
 RADARR_API_KEY = os.environ.get("RADARR_API_KEY", "")
@@ -57,6 +57,15 @@ try:
 except OSError as exc:
     log.warning("Datei-Logging nicht verfügbar (%s): %s", LOG_FILE, exc)
 app = Flask(__name__)
+
+
+@app.get("/sw.js")
+def service_worker():
+    """Serve the worker from the origin root so it can control the whole app."""
+    response = send_from_directory(app.static_folder, "sw.js", mimetype="application/javascript")
+    response.headers["Service-Worker-Allowed"] = "/"
+    response.headers["Cache-Control"] = "no-cache, no-store, must-revalidate"
+    return response
 executor = ThreadPoolExecutor(max_workers=int(os.environ.get("SCAN_WORKERS", "2")))
 scan_executor = ThreadPoolExecutor(max_workers=int(os.environ.get("SCAN_WORKERS", "4")))
 jobs = {"radarr": {"state": "idle", "total": 0, "done": 0, "error": None}, "sonarr": {"state": "idle", "total": 0, "done": 0, "error": None}}