PR 5 follow-up: boolean radio buttons and seed missing settings

- Replace true/false text display with Yes/No radio button groups for
  boolean platform settings; toggling auto-submits the form so no Edit
  modal is needed for flags
- IsBool() helper detects *Enabled, *AppliesToTrials, *TrialsEnabled keys
- Hide Edit button for boolean settings (radio buttons are the control)
- Add AI group icon (bi-robot) and description to the group header switch
- Add Max key detection to InputType/InputHint for number inputs
- Migration AddMissingPlatformSettings seeds 6 previously missing rows
  (SmsEnabled, TrialsEnabled, GracePeriodDays, GracePeriodAppliesToTrials,
  MaxTenants, AiCatalogPriceCheckEnabled) using IF NOT EXISTS guards

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/PowderCoating.Infrastructure/Migrations/20260513013449_AddMissingPlatformSettings.cs

@@ -0,0 +1,88 @@
+using System;
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace PowderCoating.Infrastructure.Migrations
+{
+    /// <inheritdoc />
+    public partial class AddMissingPlatformSettings : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            // Conditional inserts — safe to run against a DB that already has some of these keys set manually.
+            migrationBuilder.Sql(@"
+                IF NOT EXISTS (SELECT 1 FROM PlatformSettings WHERE [Key] = 'SmsEnabled')
+                    INSERT INTO PlatformSettings ([Key],[Value],[Label],[Description],[GroupName])
+                    VALUES ('SmsEnabled','false','SMS Enabled','Platform-level switch for outbound SMS. When off, no SMS messages are sent regardless of company settings.','Notifications');
+
+                IF NOT EXISTS (SELECT 1 FROM PlatformSettings WHERE [Key] = 'TrialsEnabled')
+                    INSERT INTO PlatformSettings ([Key],[Value],[Label],[Description],[GroupName])
+                    VALUES ('TrialsEnabled','true','Trials Enabled','Allow new companies to register with a free trial period. When off, registration requires a paid plan immediately.','Subscriptions');
+
+                IF NOT EXISTS (SELECT 1 FROM PlatformSettings WHERE [Key] = 'GracePeriodDays')
+                    INSERT INTO PlatformSettings ([Key],[Value],[Label],[Description],[GroupName])
+                    VALUES ('GracePeriodDays','14','Grace Period (days)','Days after subscription expiry before access is fully cut off. Gives companies time to renew without an abrupt lockout.','Subscriptions');
+
+                IF NOT EXISTS (SELECT 1 FROM PlatformSettings WHERE [Key] = 'GracePeriodAppliesToTrials')
+                    INSERT INTO PlatformSettings ([Key],[Value],[Label],[Description],[GroupName])
+                    VALUES ('GracePeriodAppliesToTrials','false','Grace Period Applies to Trials','When enabled, trial companies also receive the grace period after expiry rather than being cut off immediately.','Subscriptions');
+
+                IF NOT EXISTS (SELECT 1 FROM PlatformSettings WHERE [Key] = 'MaxTenants')
+                    INSERT INTO PlatformSettings ([Key],[Value],[Label],[Description],[GroupName])
+                    VALUES ('MaxTenants','-1','Max Tenants','Maximum number of active tenant companies allowed on the platform. Set to -1 for no limit.','Subscriptions');
+
+                IF NOT EXISTS (SELECT 1 FROM PlatformSettings WHERE [Key] = 'AiCatalogPriceCheckEnabled')
+                    INSERT INTO PlatformSettings ([Key],[Value],[Label],[Description],[GroupName])
+                    VALUES ('AiCatalogPriceCheckEnabled','true','AI Catalog Price Check','Platform-level switch for the AI catalog price review feature. When off, the feature is disabled for all companies regardless of their settings.','AI');
+            ");
+
+            migrationBuilder.UpdateData(
+                table: "PricingTiers",
+                keyColumn: "Id",
+                keyValue: 1,
+                column: "CreatedAt",
+                value: new DateTime(2026, 5, 13, 1, 34, 45, 450, DateTimeKind.Utc).AddTicks(8377));
+
+            migrationBuilder.UpdateData(
+                table: "PricingTiers",
+                keyColumn: "Id",
+                keyValue: 2,
+                column: "CreatedAt",
+                value: new DateTime(2026, 5, 13, 1, 34, 45, 450, DateTimeKind.Utc).AddTicks(8383));
+
+            migrationBuilder.UpdateData(
+                table: "PricingTiers",
+                keyColumn: "Id",
+                keyValue: 3,
+                column: "CreatedAt",
+                value: new DateTime(2026, 5, 13, 1, 34, 45, 450, DateTimeKind.Utc).AddTicks(8385));
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.UpdateData(
+                table: "PricingTiers",
+                keyColumn: "Id",
+                keyValue: 1,
+                column: "CreatedAt",
+                value: new DateTime(2026, 5, 11, 14, 23, 23, 221, DateTimeKind.Utc).AddTicks(5837));
+
+            migrationBuilder.UpdateData(
+                table: "PricingTiers",
+                keyColumn: "Id",
+                keyValue: 2,
+                column: "CreatedAt",
+                value: new DateTime(2026, 5, 11, 14, 23, 23, 221, DateTimeKind.Utc).AddTicks(5846));
+
+            migrationBuilder.UpdateData(
+                table: "PricingTiers",
+                keyColumn: "Id",
+                keyValue: 3,
+                column: "CreatedAt",
+                value: new DateTime(2026, 5, 11, 14, 23, 23, 221, DateTimeKind.Utc).AddTicks(5847));
+        }
+    }
+}

src/PowderCoating.Infrastructure/Migrations/ApplicationDbContextModelSnapshot.cs

@@ -6574,7 +6574,7 @@ namespace PowderCoating.Infrastructure.Migrations
                         {
                             Id = 1,
                             CompanyId = 0,
-                            CreatedAt = new DateTime(2026, 5, 11, 14, 23, 23, 221, DateTimeKind.Utc).AddTicks(5837),
+                            CreatedAt = new DateTime(2026, 5, 13, 1, 34, 45, 450, DateTimeKind.Utc).AddTicks(8377),
                             Description = "Standard pricing for regular customers",
                             DiscountPercent = 0m,
                             IsActive = true,
@@ -6585,7 +6585,7 @@ namespace PowderCoating.Infrastructure.Migrations
                         {
                             Id = 2,
                             CompanyId = 0,
-                            CreatedAt = new DateTime(2026, 5, 11, 14, 23, 23, 221, DateTimeKind.Utc).AddTicks(5846),
+                            CreatedAt = new DateTime(2026, 5, 13, 1, 34, 45, 450, DateTimeKind.Utc).AddTicks(8383),
                             Description = "5% discount for preferred customers",
                             DiscountPercent = 5m,
                             IsActive = true,
@@ -6596,7 +6596,7 @@ namespace PowderCoating.Infrastructure.Migrations
                         {
                             Id = 3,
                             CompanyId = 0,
-                            CreatedAt = new DateTime(2026, 5, 11, 14, 23, 23, 221, DateTimeKind.Utc).AddTicks(5847),
+                            CreatedAt = new DateTime(2026, 5, 13, 1, 34, 45, 450, DateTimeKind.Utc).AddTicks(8385),
                             Description = "10% discount for premium customers",
                             DiscountPercent = 10m,
                             IsActive = true,

src/PowderCoating.Web/Views/PlatformSettings/Index.cshtml

@@ -12,23 +12,31 @@
         "Subscriptions"  => "bi-credit-card",
         "Quotes"         => "bi-file-earmark-text",
         "Data Retention" => "bi-clock-history",
+        "AI"             => "bi-robot",
         _                => "bi-globe"
     };
 
     static string GroupDescription(string group) => group switch
     {
-        "Notifications"  => "Controls where platform event alerts (signups, bug reports, billing events) are sent.",
+        "Notifications"  => "Controls where platform event alerts (signups, bug reports, billing events) are sent, and whether SMS is active.",
-        "Subscriptions"  => "Trial and billing defaults applied to new tenant companies at registration.",
+        "Subscriptions"  => "Trial and billing defaults applied to new tenant companies at registration, including grace periods and tenant limits.",
         "Quotes"         => "Default validity windows and token expiry for customer-facing quote links.",
         "Data Retention" => "How long audit and webhook records are kept before the nightly purge removes them.",
+        "AI"             => "Platform-level feature flags for AI-powered features. These override any company-level settings.",
         _                => "Core platform configuration values used across features and email links."
     };
 
+    static bool IsBool(string key) =>
+        key.EndsWith("Enabled", StringComparison.OrdinalIgnoreCase) ||
+        key.EndsWith("AppliesToTrials", StringComparison.OrdinalIgnoreCase) ||
+        key.EndsWith("TrialsEnabled", StringComparison.OrdinalIgnoreCase);
+
     static string InputType(string key) => key switch
     {
         var k when k.Contains("Email", StringComparison.OrdinalIgnoreCase) => "email",
         var k when k.Contains("Url",   StringComparison.OrdinalIgnoreCase) => "url",
         var k when k.Contains("Days",  StringComparison.OrdinalIgnoreCase) => "number",
+        var k when k.Contains("Max",   StringComparison.OrdinalIgnoreCase) => "number",
         _ => "text"
     };
 
@@ -37,6 +45,7 @@
         var k when k.Contains("Email", StringComparison.OrdinalIgnoreCase) => "e.g. admin@example.com",
         var k when k.Contains("Url",   StringComparison.OrdinalIgnoreCase) => "e.g. https://app.yourdomain.com",
         var k when k.Contains("Days",  StringComparison.OrdinalIgnoreCase) => "Enter a whole number of days",
+        var k when k.Contains("Max",   StringComparison.OrdinalIgnoreCase) => "Enter a whole number, or -1 for unlimited",
         _ => ""
     };
 }
@@ -106,7 +115,27 @@
                                         <div class="setting-meta font-monospace mt-1 text-muted">@s.Key</div>
                                     </td>
                                     <td class="align-middle">
-                                        @if (string.IsNullOrWhiteSpace(s.Value))
+                                        @if (IsBool(s.Key))
+                                        {
+                                            var isOn = string.Equals(s.Value, "true", StringComparison.OrdinalIgnoreCase);
+                                            <form asp-action="Save" method="post" class="d-inline">
+                                                @Html.AntiForgeryToken()
+                                                <input type="hidden" name="key" value="@s.Key" />
+                                                <div class="btn-group btn-group-sm" role="group">
+                                                    <input type="radio" class="btn-check" name="value"
+                                                           id="@(s.Key)_yes" value="true"
+                                                           @(isOn ? "checked" : "")
+                                                           onchange="this.form.submit()" />
+                                                    <label class="btn @(isOn ? "btn-success" : "btn-outline-success")" for="@(s.Key)_yes">Yes</label>
+                                                    <input type="radio" class="btn-check" name="value"
+                                                           id="@(s.Key)_no" value="false"
+                                                           @(!isOn ? "checked" : "")
+                                                           onchange="this.form.submit()" />
+                                                    <label class="btn @(!isOn ? "btn-danger" : "btn-outline-danger")" for="@(s.Key)_no">No</label>
+                                                </div>
+                                            </form>
+                                        }
+                                        else if (string.IsNullOrWhiteSpace(s.Value))
                                         {
                                             <span class="text-muted fst-italic">Not set</span>
                                         }
@@ -126,6 +155,8 @@
                                         }
                                     </td>
                                     <td class="text-end pe-4 align-middle">
+                                        @if (!IsBool(s.Key))
+                                        {
                                             <button class="btn btn-sm btn-outline-primary"
                                                     data-bs-toggle="modal"
                                                     data-bs-target="#editModal"
@@ -136,6 +167,7 @@
                                                     data-hint="@InputHint(s.Key)">
                                                 <i class="bi bi-pencil me-1"></i>Edit
                                             </button>
+                                        }
                                     </td>
                                 </tr>
                             }