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-delete.json

@@ -2,20 +2,20 @@
   "cookies": [
     {
       "name": "refresh_token",
-      "value": "DlW9UoiIvVxuPPp3wfo3qsVP5tlO2Iw2e8TZThWeMDw",
+      "value": "fgz_j-G_5UJ-xLf2dJBqcrtiWJkC3amMr8Y90dx_Kdo",
       "domain": "localhost",
       "path": "/api/auth",
-      "expires": 1787504746.877459,
+      "expires": 1791672153.435032,
       "httpOnly": true,
       "secure": true,
       "sameSite": "Strict"
     },
     {
       "name": "access_token",
-      "value": "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJlbWFpbCI6ImUyZS1kZWxldGVAdGVzdC5jb20iLCJ1c2VyX2lkIjoiM2E3ZDA3NjYtYTQyNy00NTQ5LWE0NGEtMWU0ZjUwOGRhZDBhIiwidG9rZW5fdmVyc2lvbiI6MCwiZXhwIjoxNzc5NzM5NTQ2fQ.jFLpGeJBM7U-x-N1jT-muHjBStXFyeb5oQS0LryWwr0",
+      "value": "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJlbWFpbCI6ImUyZS1kZWxldGVAdGVzdC5jb20iLCJ1c2VyX2lkIjoiYjExZTViNzItNGJlOC00YmY1LTk0ODYtMjE2Nzc5ZGU4Y2ViIiwidG9rZW5fdmVyc2lvbiI6MCwiZXhwIjoxNzgzOTA2OTUzfQ.rTfjAYCaaRGAtRrP3eOegQNkIq_o7kTIgvGW9Sn3bO0",
       "domain": "localhost",
       "path": "/",
-      "expires": 1779739546.877411,
+      "expires": 1783906953.43499,
       "httpOnly": true,
       "secure": true,
       "sameSite": "Lax"
@@ -27,11 +27,11 @@
       "localStorage": [
         {
           "name": "authSyncEvent",
-          "value": "{\"type\":\"logout\",\"at\":1779728746722}"
+          "value": "{\"type\":\"logout\",\"at\":1783896153271}"
         },
         {
           "name": "parentAuth",
-          "value": "{\"expiresAt\":1779901547028}"
+          "value": "{\"expiresAt\":1784068953610}"
         }
       ]
     }