Fix login redirect — access result.data.token/user

Login/register pages now correctly unwrap API response {data: {token, user}}.
Cleaned up leftover apiFetch code.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

apps/tasks/public/manifest.json

@@ -1,17 +1 @@
-{
-  "name": "Task Team",
-  "short_name": "Tasks",
-  "description": "Správa úkolů pro tým",
-  "start_url": "/tasks",
-  "display": "standalone",
-  "background_color": "#0a0a0a",
-  "theme_color": "#3B82F6",
-  "orientation": "portrait-primary",
-  "icons": [
-    {"src": "/icon-192.png", "sizes": "192x192", "type": "image/png"},
-    {"src": "/icon-512.png", "sizes": "512x512", "type": "image/png", "purpose": "any maskable"}
-  ],
-  "categories": ["productivity", "utilities"],
-  "lang": "cs",
-  "dir": "ltr"
-}
+{"name":"Task Team","short_name":"Tasks","start_url":"/","display":"standalone","background_color":"#0A0A0F","theme_color":"#1D4ED8","icons":[{"src":"/icon-192.png","sizes":"192x192","type":"image/png","purpose":"any maskable"},{"src":"/icon-512.png","sizes":"512x512","type":"image/png","purpose":"any maskable"}]}