feat(home-dialog): seed file + importer + bootstrap hookup

Mirrors banners pattern: clear-and-rewrite from per-table JSON seed.
Ships one entry pointing at parent_gacha_id 80032 to match the
2026-06-03 prod capture.

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

SVSim.UnitTests/Importers/MyPageGlobalsImporterTests.cs

@@ -157,6 +157,53 @@ public class MyPageGlobalsImporterTests
             "SealedSeason singleton must remain a single row on re-run");
     }
 
+    [Test]
+    public async Task Imports_home_dialogs_from_seed_file()
+    {
+        using var factory = new SVSimTestFactory();
+        using var scope = factory.Services.CreateScope();
+        var db = scope.ServiceProvider.GetRequiredService<SVSimDbContext>();
+
+        var importer = new MyPageGlobalsImporter();
+        await importer.ImportHomeDialogsAsync(db, SeedDir);
+
+        var rows = await db.HomeDialogEntries.OrderBy(e => e.Id).ToListAsync();
+        Assert.That(rows.Count, Is.GreaterThan(0), "seed must contain at least one home dialog");
+
+        var first = rows[0];
+        Assert.That(first.TitleTextId, Is.Not.Empty);
+        Assert.That(first.Image, Is.Not.Empty);
+        Assert.That(first.ButtonListJson, Does.StartWith("["),
+            "button_list must round-trip as a JSON array string");
+        Assert.That(first.EndTime, Is.GreaterThan(first.BeginTime));
+    }
+
+    [Test]
+    public async Task Home_dialogs_are_clear_and_rewrite()
+    {
+        using var factory = new SVSimTestFactory();
+        using var scope = factory.Services.CreateScope();
+        var db = scope.ServiceProvider.GetRequiredService<SVSimDbContext>();
+
+        db.HomeDialogEntries.Add(new HomeDialogEntry
+        {
+            Id = 999,
+            TitleTextId = "legacy",
+            Image = "legacy_image",
+            ButtonListJson = "[]",
+            BeginTime = DateTime.UtcNow.AddYears(-1),
+            EndTime = DateTime.UtcNow.AddYears(-1).AddDays(1),
+        });
+        await db.SaveChangesAsync();
+
+        var importer = new MyPageGlobalsImporter();
+        await importer.ImportHomeDialogsAsync(db, SeedDir);
+
+        var stale = await db.HomeDialogEntries.FindAsync(999);
+        Assert.That(stale, Is.Null,
+            "ImportHomeDialogsAsync must clear-and-rewrite — pre-existing legacy rows must be removed");
+    }
+
     [Test]
     public async Task Master_point_ranking_period_leaves_existing_rows_untouched()
     {

SVSim.UnitTests/Infrastructure/SVSimTestFactory.cs

@@ -276,6 +276,7 @@ internal sealed class SVSimTestFactory : WebApplicationFactory<Program>
         await mypage.ImportSealedAsync(ctx, seedDir);
         await mypage.ImportMasterPointRankingPeriodAsync(ctx, seedDir);
         await mypage.ImportSpecialDeckFormatsAsync(ctx, seedDir);
+        await mypage.ImportHomeDialogsAsync(ctx, seedDir);
 
         await new DefaultDeckImporter().ImportAsync(ctx, seedDir);
         await new PackImporter().ImportAsync(ctx, seedDir);