UI: portal/header refinements, board index UX, and user settings

app/Models/UserSetting.php

@@ -0,0 +1,18 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+
+class UserSetting extends Model
+{
+    protected $fillable = [
+        'user_id',
+        'key',
+        'value',
+    ];
+
+    protected $casts = [
+        'value' => 'array',
+    ];
+}