WebAuthn biometric + PWA widget + UI header fixes + mobile responsive

- WebAuthn: register/auth options, device management
- PWA widget page + manifest shortcuts
- Group schedule endpoint (timezones + locations)
- UI #3-#6: compact headers on tasks/calendar/projects/goals
- UI #9: mobile responsive top bars
- webauthn_credentials table

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

apps/tasks/public/manifest.json

@@ -1 +1,46 @@
-{"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"}]}
+{
+  "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"
+    }
+  ],
+  "shortcuts": [
+    {
+      "name": "Novy ukol",
+      "short_name": "Pridat",
+      "url": "/tasks?action=new",
+      "icons": [
+        {
+          "src": "/icon-192.png",
+          "sizes": "192x192"
+        }
+      ]
+    },
+    {
+      "name": "Widget",
+      "short_name": "Widget",
+      "url": "/widget",
+      "icons": [
+        {
+          "src": "/icon-192.png",
+          "sizes": "192x192"
+        }
+      ]
+    }
+  ]
+}