Refactor MgGridBase filter panel & unify filter criteria

- Moved quick-filter panel below toolbar in MgGridBase for improved layout and visual alignment; FilterPanel now renders as a styled band between toolbar and group panel.
- Exposed GridSizeMode on IMgGridBase and MgGridBase; MgTagBox now inherits grid density by default for consistent sizing.
- Renamed FilterText to CustomFilterCriteria across grid/data source classes and tests to clarify its role as a DevExpress criteria string.
- Updated documentation (README.md, MGGRID_PARAMETERS.md, GLOSSARY.md, ADR 0004) to reflect filter panel placement, parameter naming, and sizing/layout changes.
- Adjusted CSS for new filter panel layout and visual integration.
- Updated example usages and tests to match new API and layout.

AyCode.Services.Server.Tests/SignalRs/SignalRDatasources/README.md

@@ -7,7 +7,7 @@ DataSource CRUD, collection, tracking, and filter tests. Tested with List and Ac
 ### Test Base (partial class)
 - **`SignalRDataSourceTestBase.cs`** — Abstract generic base with SignalR infrastructure setup.
 - **`SignalRDataSourceTestBase.Collections.cs`** — Count, Clear, Contains tests.
-- **`SignalRDataSourceTestBase.ContextAndFilter.cs`** — ContextIds, FilterText, Expression filter with AcExpressionNode.
+- **`SignalRDataSourceTestBase.ContextAndFilter.cs`** — ContextIds, CustomFilterCriteria, Expression filter with AcExpressionNode.
 - **`SignalRDataSourceTestBase.CrudOperations.cs`** — Add (auto-save, tracking-only, duplicate/default ID validation).
 - **`SignalRDataSourceTestBase.LoadDataSource.cs`** — Full DataSource load.
 - **`SignalRDataSourceTestBase.LoadItem.cs`** — Single item load by ID.

AyCode.Services.Server.Tests/SignalRs/SignalRDatasources/SignalRDataSourceTestBase.ContextAndFilter.cs

@@ -22,12 +22,12 @@ public abstract partial class SignalRDataSourceTestBase<TDataSource, TIList>
     }
 
     [TestMethod]
-    public virtual void FilterText_CanBeSetAndRetrieved()
+    public virtual void CustomFilterCriteria_CanBeSetAndRetrieved()
     {
         var dataSource = CreateDataSource(_client, _crudTags);
-        dataSource.FilterText = "search term";
+        dataSource.CustomFilterCriteria = "search term";
 
-        Assert.AreEqual("search term", dataSource.FilterText);
+        Assert.AreEqual("search term", dataSource.CustomFilterCriteria);
     }
 
     #endregion

AyCode.Services.Server.Tests/SignalRs/SignalRDatasources/SignalRDataSourceTests_List_Binary.cs

@@ -131,7 +131,7 @@ public class SignalRDataSourceTests_List_Binary : SignalRDataSourceTestBase<Test
     [TestMethod]
     public override void ContextIds_CanBeSetAndRetrieved() => base.ContextIds_CanBeSetAndRetrieved();
     [TestMethod]
-    public override void FilterText_CanBeSetAndRetrieved() => base.FilterText_CanBeSetAndRetrieved();
+    public override void CustomFilterCriteria_CanBeSetAndRetrieved() => base.CustomFilterCriteria_CanBeSetAndRetrieved();
     [TestMethod]
     public override void IList_Add_ReturnsCorrectIndex() => base.IList_Add_ReturnsCorrectIndex();
     [TestMethod]

AyCode.Services.Server.Tests/SignalRs/SignalRDatasources/SignalRDataSourceTests_List_Binary_NoRef.cs

@@ -131,7 +131,7 @@ public class SignalRDataSourceTests_List_Binary_NoRef : SignalRDataSourceTestBas
     [TestMethod]
     public override void ContextIds_CanBeSetAndRetrieved() => base.ContextIds_CanBeSetAndRetrieved();
     [TestMethod]
-    public override void FilterText_CanBeSetAndRetrieved() => base.FilterText_CanBeSetAndRetrieved();
+    public override void CustomFilterCriteria_CanBeSetAndRetrieved() => base.CustomFilterCriteria_CanBeSetAndRetrieved();
     [TestMethod]
     public override void IList_Add_ReturnsCorrectIndex() => base.IList_Add_ReturnsCorrectIndex();
     [TestMethod]

AyCode.Services.Server.Tests/SignalRs/SignalRDatasources/SignalRDataSourceTests_List_Json.cs

@@ -136,7 +136,7 @@ public class SignalRDataSourceTests_List_Json : SignalRDataSourceTestBase<TestOr
     [TestMethod]
     public override void ContextIds_CanBeSetAndRetrieved() => base.ContextIds_CanBeSetAndRetrieved();
     [TestMethod]
-    public override void FilterText_CanBeSetAndRetrieved() => base.FilterText_CanBeSetAndRetrieved();
+    public override void CustomFilterCriteria_CanBeSetAndRetrieved() => base.CustomFilterCriteria_CanBeSetAndRetrieved();
     [TestMethod]
     public override void IList_Add_ReturnsCorrectIndex() => base.IList_Add_ReturnsCorrectIndex();
     [TestMethod]

AyCode.Services.Server.Tests/SignalRs/SignalRDatasources/SignalRDataSourceTests_Observable_Binary.cs

@@ -132,7 +132,7 @@ public class SignalRDataSourceTests_Observable_Binary : SignalRDataSourceTestBas
     [TestMethod]
     public override void ContextIds_CanBeSetAndRetrieved() => base.ContextIds_CanBeSetAndRetrieved();
     [TestMethod]
-    public override void FilterText_CanBeSetAndRetrieved() => base.FilterText_CanBeSetAndRetrieved();
+    public override void CustomFilterCriteria_CanBeSetAndRetrieved() => base.CustomFilterCriteria_CanBeSetAndRetrieved();
     [TestMethod]
     public override void IList_Add_ReturnsCorrectIndex() => base.IList_Add_ReturnsCorrectIndex();
     [TestMethod]

AyCode.Services.Server.Tests/SignalRs/SignalRDatasources/SignalRDataSourceTests_Observable_Json.cs

@@ -136,7 +136,7 @@ public class SignalRDataSourceTests_Observable_Json : SignalRDataSourceTestBase<
     [TestMethod]
     public override void ContextIds_CanBeSetAndRetrieved() => base.ContextIds_CanBeSetAndRetrieved();
     [TestMethod]
-    public override void FilterText_CanBeSetAndRetrieved() => base.FilterText_CanBeSetAndRetrieved();
+    public override void CustomFilterCriteria_CanBeSetAndRetrieved() => base.CustomFilterCriteria_CanBeSetAndRetrieved();
     [TestMethod]
     public override void IList_Add_ReturnsCorrectIndex() => base.IList_Add_ReturnsCorrectIndex();
     [TestMethod]

AyCode.Services/SignalRs/AcSignalRDataSource.cs

@@ -176,7 +176,13 @@ namespace AyCode.Services.SignalRs
         protected readonly ChangeTracking<TDataItem, TId> TrackingItems = new();
 
         public object[]? ContextIds;
-        public string? FilterText { get; set; }
+        /// <summary>
+        /// Consumer-supplied base filter criteria (a DevExpress CriteriaOperator string) appended as the LAST
+        /// positional GetAll parameter; the server parses + whitelists it. Renamed FilterText → CustomFilterText →
+        /// CustomFilterCriteria (2026-07-16) as the semantics settled to a criteria string. Under the ADR-0004
+        /// unified model it is AND-merged with the grid's automatic FilterCriteria.
+        /// </summary>
+        public string? CustomFilterCriteria { get; set; }
 
         public AcSignalRClientBase SignalRClient;
         protected readonly SignalRCrudTags SignalRCrudTags;
@@ -258,7 +264,7 @@ namespace AyCode.Services.SignalRs
         {
             var parameters = new List<object>();
             if (ContextIds != null) parameters.AddRange(ContextIds);
-            if (FilterText != null) parameters.Add(FilterText);
+            if (CustomFilterCriteria != null) parameters.Add(CustomFilterCriteria);
 
             if (parameters.Count == 0) parameters = null;
             return parameters?.ToArray();

AyCode.Services/docs/SIGNALR_DATASOURCE/README.md

@@ -109,7 +109,7 @@ await dataSource.LoadItem(id);                                            // sin
 
 3. **Fallback re-serialize** (responseData neither `byte[]` nor `TIList` — e.g., bare `List<T>` in test scenarios without protocol): `AcBinarySerializer.Serialize(responseData)` → bytes → process as Path 1 (Binary).
 
-**Context/Filtering:** `ContextIds` (`object[]`) and `FilterText` (`string`) are sent with every GetAll request for server-side filtering.
+**Context/Filtering:** `ContextIds` (`object[]`) and `CustomFilterCriteria` (`string` — a DevExpress criteria string; renamed from `FilterText` → `CustomFilterText` 2026-07-16) are sent with every GetAll request for server-side filtering.
 
 ## Change Tracking
 

AyCode.Services/docs/SIGNALR_DATASOURCE/SIGNALR_DATASOURCE_TODO.md

@@ -2,7 +2,7 @@
 
 Forward-looking work specific to `AcSignalRDataSource`. Transport-side TODOs live in `../SIGNALR/SIGNALR_TODO.md`.
 
-> **Server-side filtering — design in ADR 0004.** The client→server filter mechanism (`SignalParams.FilterText` + `[SignalRFilterText]` hub injection + filter-service + per-entity whitelist) is captured in [`0004-signalr-datasource-server-side-filtering.md`](../../../docs/adr/0004-signalr-datasource-server-side-filtering.md) (Status: Proposed). Not yet broken into per-step entries — reference the ADR when implementation begins.
+> **Server-side filtering — design in ADR 0004.** The client→server filter mechanism (`SignalParams.FilterCriteria` + `[FilterCriteriaParam]` hub injection + filter-service with zero-config whitelist) is captured in [`0004-signalr-datasource-server-side-filtering.md`](../../../docs/adr/0004-signalr-datasource-server-side-filtering.md) (Status: Proposed). Not yet broken into per-step entries — reference the ADR when implementation begins.
 
 ## Priority legend
 - **P0** blocker · **P1** important · **P2** nice-to-have · **P3** idea