feat(1.13.0): page grants on the standard admissions-style pattern

unifi_page_grants gains role + default grantee types and can_view
(deny-by-default "Everyone else" row); enforcement moves from the
RouteMatched listener — where request->user() is always null and the
check silently failed open — into route-appended middleware with the
permission-holder pass. Pages-access endpoints gain role search +
default-row handling.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

database/migrations/2026_06_12_000001_add_role_and_default_to_unifi_page_grants.php

@@ -0,0 +1,62 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\DB;
+use Illuminate\Support\Facades\Schema;
+
+/**
+ * Brings unifi_page_grants to parity with adm_access_grants /
+ * directory_access_grants: widens grantee_type to include 'default' and
+ * 'role', allows a NULL grantee_id (used by the per-page default row),
+ * and adds a can_view column. The default row's can_view carries the
+ * deny/allow fallback for users not matched by a more specific grant
+ * (deny by default — no row means deny).
+ *
+ * Existing user/group rows keep working: adding can_view with a default
+ * of true backfills them as explicit allow grants.
+ */
+return new class extends Migration
+{
+    public function up(): void
+    {
+        if (! Schema::hasTable('unifi_page_grants')) return;
+
+        // Widen the enum and allow NULL grantee_id (default rows). MySQL
+        // enum changes require raw DDL.
+        DB::statement("ALTER TABLE unifi_page_grants MODIFY grantee_type ENUM('default','user','group','role') NOT NULL");
+        DB::statement("ALTER TABLE unifi_page_grants MODIFY grantee_id BIGINT UNSIGNED NULL");
+
+        if (! Schema::hasColumn('unifi_page_grants', 'can_view')) {
+            Schema::table('unifi_page_grants', function (Blueprint $table) {
+                $table->boolean('can_view')->default(true)->after('grantee_id');
+            });
+
+            // Belt and braces: make sure every pre-existing user/group row
+            // is an explicit allow grant.
+            DB::table('unifi_page_grants')->update(['can_view' => true]);
+        }
+
+        // The unique index on (nav_item_id, grantee_type, grantee_id)
+        // already exists from the create migration
+        // ('unifi_page_grants_unique') and still applies — grantee_id is
+        // NULL for default rows, and MySQL treats NULLs as distinct, so
+        // app code enforces one default row per nav_item.
+    }
+
+    public function down(): void
+    {
+        if (! Schema::hasTable('unifi_page_grants')) return;
+
+        if (Schema::hasColumn('unifi_page_grants', 'can_view')) {
+            Schema::table('unifi_page_grants', function (Blueprint $table) {
+                $table->dropColumn('can_view');
+            });
+        }
+
+        DB::table('unifi_page_grants')->whereIn('grantee_type', ['default', 'role'])->delete();
+
+        DB::statement("ALTER TABLE unifi_page_grants MODIFY grantee_type ENUM('user','group') NOT NULL");
+        DB::statement("ALTER TABLE unifi_page_grants MODIFY grantee_id BIGINT UNSIGNED NOT NULL");
+    }
+};