feat: KBX v60 Phase 4 complete — KbxQuantityField + index exports

Add KbxQuantityField (increment/decrement spinner) + update index exports
for all Phase 3.5–4 components (wrapper, form, specialized fields).

Components shipped:
- KbxScreenFrame, KbxTemplateStateBoundary, KbxSummaryBar (wrapper)
- KbxFormGrid, KbxFormSection (layout)
- KbxInput, KbxSelect, KbxDateField, KbxNumberField, KbxTextarea, KbxCheckbox (basic fields)
- KbxMoneyField, KbxQuantityField, KbxRadio (specialized fields)
- 9 template/composite/advanced (T02, T03, T06, T07, DataGrid, Dialog, Drawer, Tabs, Lookup)

Total Phase 1–4: 30 components, ~3500 LOC, contracts, registries, composables, tokens, app init complete.
Ready for page implementation using KbxScreenFrame wrapper pattern.

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

src/KArtSell.Modules.ModelOperations/ShadowRun/Services/KrxDataService.cs

@@ -1,6 +1,7 @@
 using System.Net;
 using System.Text.Json;
 using Dapper;
+using KArtSell.BuildingBlocks.Time;
 using Microsoft.Extensions.Caching.Memory;
 using Microsoft.Extensions.Logging;
 using Npgsql;
@@ -18,6 +19,7 @@ public sealed class KrxDataService : IKrxDataService
     private readonly IMemoryCache _cache;
     private readonly ILogger<KrxDataService> _logger;
     private readonly NpgsqlDataSource _dataSource;
+    private readonly IClock _clock;
 
     private const int CacheDurationMinutes = 1440;  // 24 hours
     private const int RecentDaysWindow = 7;  // Last 7 days: always refresh (mutable data)
@@ -55,11 +57,13 @@ public sealed class KrxDataService : IKrxDataService
         HttpClient httpClient,
         IMemoryCache cache,
         ILogger<KrxDataService> logger,
+        IClock clock,
         NpgsqlDataSource? dataSource = null)
     {
         _httpClient = httpClient;
         _cache = cache;
         _logger = logger;
+        _clock = clock;
         _dataSource = dataSource!;
     }
 
@@ -117,7 +121,7 @@ public sealed class KrxDataService : IKrxDataService
         LogFetchingOhlcv(_logger, ticker, startDate, endDate, null);
 
         // Incremental fetching: Skip old, immutable data that was already collected
-        var today = DateOnly.FromDateTime(DateTime.UtcNow.Date);
+        var today = DateOnly.FromDateTime(_clock.UtcNow.Date);
         var lastSuccessfulImport = await GetLastSuccessfulImportDateAsync(cancellationToken);
 
         // Strategy: Only fetch data from 7 days ago onwards (last 7 days always fresh)