Add school dress rules tab in Management with tests.

tests/HSchool.AppHost.Tests/DressRulesApiTests.cs

@@ -54,6 +54,38 @@ public class DressRulesApiTests(AppHostFixture fixture)
         Assert.Equal(before.Worn.Select(row => row.DefName), after.Worn.Select(row => row.DefName));
     }
 
+    [Fact]
+    public async Task UnknownForm_Returns400()
+    {
+        using var client = fixture.App.CreateHttpClient("server");
+        await SchoolApiTests.ResetAsync(client);
+        var school = await SchoolApiTests.CreateAsync(client, "Плохая форма", Start, seed: 35);
+
+        using var response = await client.PostAsJsonAsync(
+            $"/api/schools/{school.Id}/dress-rules",
+            new { students = new { form = "tuxedo", color = "noBright" } },
+            TestContext.Current.CancellationToken);
+
+        Assert.Equal(HttpStatusCode.BadRequest, response.StatusCode);
+        Assert.Equal("unknown-form", await SchoolApiTests.ProblemCodeAsync(response));
+    }
+
+    [Fact]
+    public async Task UnknownColor_Returns400()
+    {
+        using var client = fixture.App.CreateHttpClient("server");
+        await SchoolApiTests.ResetAsync(client);
+        var school = await SchoolApiTests.CreateAsync(client, "Плохой цвет", Start, seed: 35);
+
+        using var response = await client.PostAsJsonAsync(
+            $"/api/schools/{school.Id}/dress-rules",
+            new { students = new { form = "regular", color = "neon" } },
+            TestContext.Current.CancellationToken);
+
+        Assert.Equal(HttpStatusCode.BadRequest, response.StatusCode);
+        Assert.Equal("unknown-color", await SchoolApiTests.ProblemCodeAsync(response));
+    }
+
     private sealed record DressRulesDto(DressRulePairDto Students, DressRulePairDto Staff);
 
     private sealed record DressRulePairDto(string Form, string Color);