feat: add child actions menu and achievements feature design

- Introduced a new feature specification for displaying a menu with actions (Award Certificate, Award Badge) when a child's card is clicked in ParentView.
- Created a detailed plan for an achievements system, outlining phases for implementation, including achievement taxonomy, MVP set, and UX considerations.
- Added a template for future feature specifications to standardize documentation.

frontend/e2e/.auth/user.json

@@ -2,20 +2,20 @@
   "cookies": [
     {
       "name": "refresh_token",
-      "value": "Xz4WQkQNdryfFsS3GaA09dGDz3yEaRwHxF2VdIh8LwQ",
+      "value": "5-wHHNkUIcILfUZqXFDTiggTIE4F_rhifieI07DQ6WQ",
       "domain": "localhost",
       "path": "/api/auth",
-      "expires": 1787504745.201123,
+      "expires": 1791672151.681425,
       "httpOnly": true,
       "secure": true,
       "sameSite": "Strict"
     },
     {
       "name": "access_token",
-      "value": "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJlbWFpbCI6ImUyZUB0ZXN0LmNvbSIsInVzZXJfaWQiOiJhMWVlZGNkOC1hMGE0LTQyYjMtOWU3ZC01MWRmNGM1ZTFiNTUiLCJ0b2tlbl92ZXJzaW9uIjowLCJleHAiOjE3Nzk3Mzk1NDV9.Q2q-xiDjAw8pu3t8ioaawUpGK1__5wBiPZ-vFvXHnmw",
+      "value": "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJlbWFpbCI6ImUyZUB0ZXN0LmNvbSIsInVzZXJfaWQiOiIyNTgxZmQwOS05OTMxLTQ3ZTctYmRkYi00MjEwZmQxM2U1MDkiLCJ0b2tlbl92ZXJzaW9uIjowLCJleHAiOjE3ODM5MDY5NTF9.8qvDLe203vx2YOUnzAoOmBDcT6uov4HhsM5o00UseMg",
       "domain": "localhost",
       "path": "/",
-      "expires": 1779739545.201078,
+      "expires": 1783906951.68138,
       "httpOnly": true,
       "secure": true,
       "sameSite": "Lax"
@@ -27,11 +27,11 @@
       "localStorage": [
         {
           "name": "authSyncEvent",
-          "value": "{\"type\":\"logout\",\"at\":1779728745058}"
+          "value": "{\"type\":\"logout\",\"at\":1783896151561}"
         },
         {
           "name": "parentAuth",
-          "value": "{\"expiresAt\":1779901545328}"
+          "value": "{\"expiresAt\":1784068951811}"
         }
       ]
     }