feat(datepicker): drop native datepickers in favor of AirDatePicker for better compatibility

As Firefox (still) doesn't support month input type

frontend/package-lock.json

@@ -17,6 +17,7 @@
         "@babel/preset-env": "^7.16.8",
         "@fortawesome/fontawesome-free": "^6.6.0",
         "@popperjs/core": "^2.11.8",
+        "air-datepicker": "^3.5.3",
         "alpinejs": "^3.14.1",
         "autoprefixer": "^10.4.14",
         "autosize": "^6.0.1",
@@ -2703,6 +2704,12 @@
         "acorn": "^6.0.0 || ^7.0.0 || ^8.0.0"
       }
     },
+    "node_modules/air-datepicker": {
+      "version": "3.5.3",
+      "resolved": "https://registry.npmjs.org/air-datepicker/-/air-datepicker-3.5.3.tgz",
+      "integrity": "sha512-Elf9gLhv/jidN1+TfeRJYMQRUfYx5apXw2dY5DuAMPRnNtQ4Iw9fTTJK772osmXSUB9xQ2Y8Q1Pt6pgBOQLPQw==",
+      "license": "MIT"
+    },
     "node_modules/ajv": {
       "version": "6.12.6",
       "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.12.6.tgz",