Add end-to-end tests for task modification and assignment features

- Implemented tests for editing penalty points and reward costs in `penalty-edit-points.spec.ts` and `reward-edit-cost.spec.ts`.
- Created detailed plans for task activation and assignment scenarios in `task-activated.plan.md` and `task-assignment.plan.md`.
- Added comprehensive test cases for modifying tasks, including editing points for chores, kindness acts, penalties, and rewards in `task-modified.plan.md`.
- Ensured all tests are isolated and run in serial mode to maintain state integrity.

frontend/vue-app/e2e/.auth/user.json

@@ -2,17 +2,17 @@
   "cookies": [
     {
       "name": "refresh_token",
-      "value": "cR3-UAhFv9MEhSxeLcU2J-BVxuhbFH4nBYJ3_ot_ylo",
+      "value": "13xlv0Lpv2WCL1slwsRXhVfCEBTuzXREnnUYgpfkmRU",
       "domain": "localhost",
       "path": "/api/auth",
-      "expires": 1781234351.04593,
+      "expires": 1781577686.529928,
       "httpOnly": true,
       "secure": true,
       "sameSite": "Strict"
     },
     {
       "name": "access_token",
-      "value": "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJlbWFpbCI6ImUyZUB0ZXN0LmNvbSIsInVzZXJfaWQiOiIzNWYyNzM5NS0xMGRhLTQzMTQtYjVjNC1jMDIwMmJkYjNiNDMiLCJ0b2tlbl92ZXJzaW9uIjowLCJleHAiOjE3NzM0NTkyNTF9.cqUw3IjBTkTvRFinuQCZ_DPZJsmfFeTxyGAnKt-AozQ",
+      "value": "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJlbWFpbCI6ImUyZUB0ZXN0LmNvbSIsInVzZXJfaWQiOiJjYjFhOTYzNy01ZDRkLTRiYTEtODFjNi0xYmM0MjA4M2MyY2YiLCJ0b2tlbl92ZXJzaW9uIjowLCJleHAiOjE3NzM4MDI1ODZ9.jxoB6roEbEMI0NQT3THPC68Q2L-i1gN1KCheJGCUT4U",
       "domain": "localhost",
       "path": "/",
       "expires": -1,
@@ -27,11 +27,11 @@
       "localStorage": [
         {
           "name": "authSyncEvent",
-          "value": "{\"type\":\"logout\",\"at\":1773458350728}"
+          "value": "{\"type\":\"logout\",\"at\":1773801686181}"
         },
         {
           "name": "parentAuth",
-          "value": "{\"expiresAt\":1773631151242}"
+          "value": "{\"expiresAt\":1773974486751}"
         }
       ]
     }