Harmonize navigation and modals across cookbook & shopping list, fix WebSocket proxying, and add PWA offline support

app/main.py

@@ -10,7 +10,7 @@ from typing import List, Optional, Dict, Any
 from contextlib import asynccontextmanager
 
 from fastapi import FastAPI, HTTPException, Request, Query, Form, File, UploadFile, WebSocket, WebSocketDisconnect
-from fastapi.responses import HTMLResponse, JSONResponse, RedirectResponse
+from fastapi.responses import HTMLResponse, JSONResponse, RedirectResponse, FileResponse
 from fastapi.staticfiles import StaticFiles
 from fastapi.templating import Jinja2Templates
 from datetime import datetime, date, timedelta
@@ -70,7 +70,7 @@ APP_USERNAME = os.getenv("APP_USERNAME", "admin")
 APP_PASSWORD = os.getenv("APP_PASSWORD", "wtc2026!")
 SECRET_KEY = os.getenv("SECRET_KEY", "wtc_cookbook_secret_salt_2026_supersecure")
 COOKIE_NAME = "wtc_auth"
-PUBLIC_PATHS = {"/login", "/api/login", "/favicon.ico"}
+PUBLIC_PATHS = {"/login", "/api/login", "/favicon.ico", "/manifest.json", "/sw.js"}
 
 def create_auth_token(username: str, days: int = 30) -> str:
     expiry = int(time.time()) + (days * 86400)
@@ -224,6 +224,25 @@ class ShoppingItemCategoryUpdate(BaseModel):
     category: str
 
 
+# ==========================================
+# PWA MANIFEST & SERVICE WORKER
+# ==========================================
+
+@app.get("/manifest.json")
+def get_manifest():
+    manifest_path = os.path.join(STATIC_DIR, "manifest.json")
+    if os.path.exists(manifest_path):
+        return FileResponse(manifest_path, media_type="application/manifest+json")
+    raise HTTPException(status_code=404, detail="Manifest not found")
+
+@app.get("/sw.js")
+def get_service_worker():
+    sw_path = os.path.join(STATIC_DIR, "sw.js")
+    if os.path.exists(sw_path):
+        return FileResponse(sw_path, media_type="application/javascript", headers={"Service-Worker-Allowed": "/"})
+    raise HTTPException(status_code=404, detail="Service worker not found")
+
+
 # ==========================================
 # AUTH VIEWS
 # ==========================================