build: add pwa capability

package-lock.json

@@ -14,6 +14,7 @@
         "@angular/forms": "^21.0.0",
         "@angular/platform-browser": "^21.0.0",
         "@angular/router": "^21.0.0",
+        "@angular/service-worker": "^21.0.6",
         "angular-web-sqlite": "^1.0.34",
         "rxjs": "~7.8.0",
         "tslib": "^2.3.0"
@@ -602,6 +603,25 @@
         "rxjs": "^6.5.3 || ^7.4.0"
       }
     },
+    "node_modules/@angular/service-worker": {
+      "version": "21.0.6",
+      "resolved": "https://registry.npmjs.org/@angular/service-worker/-/service-worker-21.0.6.tgz",
+      "integrity": "sha512-/T1aHc7ys3in7qTGO8MLIHvoXumMPxv7vU1C1sKbK14mw8ahwuqYo8m2Y+f6/ZcYwUZIbN3Ipd9sHEEB7VCz3A==",
+      "license": "MIT",
+      "dependencies": {
+        "tslib": "^2.3.0"
+      },
+      "bin": {
+        "ngsw-config": "ngsw-config.js"
+      },
+      "engines": {
+        "node": "^20.19.0 || ^22.12.0 || >=24.0.0"
+      },
+      "peerDependencies": {
+        "@angular/core": "21.0.6",
+        "rxjs": "^6.5.3 || ^7.4.0"
+      }
+    },
     "node_modules/@asamuzakjp/css-color": {
       "version": "4.1.1",
       "resolved": "https://registry.npmjs.org/@asamuzakjp/css-color/-/css-color-4.1.1.tgz",