fix(ui): port retail window control feedback

Map synthetic move and resize affordances to the exact DAT cursors, make chat top chrome movable, and replace stale primary-panel height caps with a dynamic screen-edge constraint. This keeps the retained wrapper adaptation aligned with retail Dragbar/Resizebar behavior.

docs/ISSUES.md

@@ -44,6 +44,81 @@ Copy this block when adding a new issue:
 
 ---
 
+## #223 — Primary panel resize stopped before the screen edge
+
+**Status:** DONE — 2026-07-17 (connected visual gate accepted)
+**Severity:** MEDIUM
+**Filed:** 2026-07-17
+**Component:** retained UI / shared main panel / resize constraints
+
+**Description:** The Inventory, Character/Skills, and Spellbook/Components
+panel could not be extended vertically to the bottom of the screen. Magic was
+not resizable at all, Character carried a fixed 760-pixel maximum, and
+Inventory calculated one maximum from its startup position that became stale
+after the shared panel moved.
+
+**Root cause / status:** Retail LayoutDesc `0x2100006E` owns one 310x372
+`gmPanelUI` host. Its primary children are all authored into the same 300x362
+content region with bottom anchoring, while the host exposes a bottom Type-9
+vertical Resizebar. acdream imports those children as separate wrappers, so
+their mount policies must preserve that one host contract. All three primary
+wrappers now expose bottom-only vertical resizing and have no ad-hoc maximum.
+The shared mount seam carries a dynamic parent-extent constraint, so pointer
+and restored/programmatic sizes use the panel's current position and stop at
+the current screen edge.
+
+**Files:** `src/AcDream.App/UI/RetailUiRuntime.cs`;
+`src/AcDream.App/UI/Layout/RetailWindowFrame.cs`;
+`src/AcDream.App/UI/UiElement.cs`; `src/AcDream.App/UI/UiRoot.cs`;
+`src/AcDream.App/UI/RetailWindowManager.cs`.
+
+**Research:**
+`docs/research/2026-07-17-retail-shared-main-panel-pseudocode.md`.
+
+**Acceptance:** Move the shared primary panel to more than one vertical
+position. In Inventory, Character/Skills, and Spellbook/Components, drag the
+bottom resize edge to the bottom of the client. Every panel must reach that
+edge without crossing it, and its anchored content must use the added height.
+
+---
+
+## #222 — Window move and resize cursors were missing
+
+**Status:** DONE — 2026-07-17 (connected visual gate accepted)
+**Severity:** MEDIUM
+**Filed:** 2026-07-17
+**Component:** retained UI / cursor feedback / window controls
+
+**Description:** Hovering or operating the retained-window move and resize
+regions left the ordinary retail pointer visible. Retail shows a four-way move
+cursor and direction-specific horizontal, vertical, and diagonal resize
+cursors.
+
+**Root cause / status:** `UiRoot` and `CursorFeedbackController` already
+identified the exact active/hovered window-control intent, but
+`RetailCursorManager` consumes cursor media rather than the semantic kind. No
+media was attached to the semantic result for synthetic wrapper edges or the
+IA-12 whole-window drag region. `RetailCursorCatalog` now maps those five
+intents to the exact direct DAT cursor surfaces and `(16,16)` hotspots authored
+on retail Type-2 Dragbar and Type-9 Resizebar controls. Authored widget media
+keeps retail captured/hovered precedence; an active synthetic control holds its
+cursor until release.
+
+**Files:** `src/AcDream.App/UI/CursorFeedbackController.cs`;
+`src/AcDream.App/UI/RetailCursorCatalog.cs`;
+`tests/AcDream.App.Tests/UI/CursorFeedbackControllerTests.cs`;
+`tests/AcDream.App.Tests/UI/RetailCursorCatalogTests.cs`.
+
+**Research:**
+`docs/research/2026-07-17-retail-window-control-cursor-pseudocode.md`.
+
+**Acceptance:** Hover every enabled window edge/corner and an empty move
+region; the correct retail cursor must appear before pressing and remain stable
+while dragging outside the original control. Locked or non-resizable windows
+must not advertise unavailable operations.
+
+---
+
 ## #221 — Primary UI panels retained independent window positions
 
 **Status:** DONE — 2026-07-17
@@ -77,12 +152,6 @@ placement and restore-previous behavior.
 Inventory, Character/Skills, and Spellbook/Components retain one position
 across switching, dragging, closing, and reopening.
 
-**Acceptance:** Open Inventory, move it, then switch directly and after closing
-to Character/Skills and Spellbook/Components. Every replacement must open at
-the most recently moved main-panel position. Move another panel and repeat in
-the opposite direction. Helpful/Harmful effects must not overwrite that
-position.
-
 ---
 
 ## #220 — Local player glides before locomotion animation starts

docs/architecture/retail-divergence-register.md

@@ -50,7 +50,7 @@ accepted-divergence entries (#96, #49, #50).
 | IA-9 | One unified camera matrix for terrain — retail's separate `LScape::update_viewpoint` landscape viewpoint does not exist | `src/AcDream.App/Rendering/TerrainModernRenderer.cs:266` | Phase W T4.2: with one matrix everywhere, viewpoint-desync bugs are unrepresentable — the unification IS the correctness argument | Anything retail derives from the landcell-relative viewpoint (float precision at extreme coords, viewpoint-keyed state) has no analogue; a future port expecting it silently reads the camera | `LScape::update_viewpoint`; `LScape::draw` 0x00506330 |
 | IA-10 | Transparent groups sorted back-to-front per GROUP by first-instance position (no within-group sort) vs retail per-poly BSP-order draw | `src/AcDream.App/Rendering/Wb/WbDrawDispatcher.cs:1364` (comparer :1662) | One MDI call per pass requires group-granularity ordering; per-poly sorting is incompatible with instanced multi-draw; works when group instances are spatially coherent | Spatially spread or interleaved transparent groups composite in the wrong order — popping / wrong see-through layering as the camera moves | retail per-poly BSP-order transparent draw (D3DPolyRender / PView::DrawCells) |
 | IA-11 | Tier-1 cross-frame batch-classification cache for static entities (retail re-walks part arrays every frame) | `src/AcDream.App/Rendering/Wb/EntityClassificationCache.cs:12` | Issue #53 perf tier; invariants documented (keys = EntityId + OWNING-landblock hint post-**#119** fix `2163308`; invalidation at despawn/LB-unload; mutation audit 2026-05-10) | Key collision or missed invalidation serves one entity another's batches — session-sticky wrong meshes (the #119 broken-stairs/water-barrel symptom) | retail per-frame part-array classification (no cache) |
-| IA-12 | UI toolkit mirrors retail behavior from research docs, not a byte-port — keystone.dll is outside decomp coverage; observed constants embedded (drag 3 px, tooltip 1000 ms). `gmPanelUI` primary children are independently imported retained frames rather than one physical parent, but `RetailPanelUiController` owns their one canonical placement and exclusive child lifecycle | `src/AcDream.App/UI/README.md:3`; `src/AcDream.App/UI/Layout/RetailPanelUiController.cs` | keystone.dll has no PDB/decomp; semantics are reconstructed from the retail UI deep-dives and named `gmPanelUI` methods. Separate child wrappers preserve each LayoutDesc's content/resize policy while typed handle synchronization gives Inventory/Character/Magic the same persistent parent position | Edge-case input semantics can differ silently; if retail relies on parent-size anchoring across a panel switch, separate child extents may resize differently even though placement and visibility match | `gmPanelUI::SetupChildren` 0x004BC9E0; `RecvNotice_SetPanelVisibility` 0x004BC6F0; docs/research/retail-ui/04-input-events.md |
+| IA-12 | UI toolkit mirrors retail behavior from research docs, not a byte-port — keystone.dll is outside decomp coverage; observed constants embedded (drag 3 px, tooltip 1000 ms). Synthetic wrapper borders/whole-window drag regions use the exact DAT Type-2/Type-9 control cursors. `gmPanelUI` primary children are independently imported retained frames rather than one physical parent, but `RetailPanelUiController` owns their one canonical placement and exclusive child lifecycle | `src/AcDream.App/UI/README.md:3`; `src/AcDream.App/UI/CursorFeedbackController.cs`; `src/AcDream.App/UI/Layout/RetailPanelUiController.cs` | keystone.dll has no PDB/decomp; semantics are reconstructed from the retail UI deep-dives and named client methods plus production LayoutDesc media. Separate child wrappers preserve each LayoutDesc's content/resize policy while typed handle synchronization gives Inventory/Character/Magic the same persistent parent position | Edge-case input semantics can differ silently; if retail relies on parent-size anchoring across a panel switch, separate child extents may resize differently even though placement and visibility match | `UIElementManager::CheckCursor` 0x0045ABF0; `UIElement_Resizebar::StartMouseResizing` 0x0046B7E0; `UIElement_Dragbar::StartMouseMoving` 0x0046C760; `gmPanelUI::SetupChildren` 0x004BC9E0; docs/research/retail-ui/04-input-events.md |
 | IA-13 | GameEventType registry deliberately omits event types retail ignores; unknown events fall through unhandled | `src/AcDream.Core.Net/Messages/GameEventType.cs:11` | Retail also ignores them — dropping matches retail by construction | If the "retail ignores X" judgment is wrong for any opcode (or a server mod uses one), the event is silently dropped with no diagnostic pointing at the omission | retail GameEvent dispatch (ignored-event set) |
 | IA-14 | Rendering + dat-handling base is WorldBuilder's tested port, not a fresh retail-decomp port (Phase N.4/O design stance) | `docs/architecture/worldbuilder-inventory.md` (code at `src/AcDream.{Core,App}/Rendering/Wb/`) | WB visually verified on the AC world, MIT, same stack; known WB↔retail deltas resolved case-by-case — terrain split kept retail `FSplitNESW` (**#51**, pinned by `SplitFormulaDivergenceTest`), scenery drift accepted (AP-31) | A WB-upstream divergence not yet caught ships silently as "our" behavior; guard = the inventory doc's 🟢/🔴 split + per-formula divergence tests | retail decomp per algorithm; `tests/.../SplitFormulaDivergenceTest.cs` |
 | IA-15 | D.2b gameplay UI is our own `UiHost`/`UiRoot` retained tree, not a byte-port of Keystone. `RetailUiRuntime` owns the production import/mount graph; `RetailWindowManager`/typed handles centralize registry, raise, focus/capture cleanup, lifecycle events, reverse-order grouped controller teardown, removable Silk input subscriptions, schema-v2 per-character/per-resolution automatic layouts, and portable named `saveui/loadui` profiles; `RetailWindowFrame` is the single production/Studio mount contract for imported-chrome and shared-wrapper windows. Production LayoutDesc imports include vitals `0x2100006C`, chat `0x21000006`, toolbar `0x21000016`, character `0x2100002E`, inventory `0x21000023` plus mounted `0x21000024/22/21`, dialog catalog `0x2100003C`, and radar `0x21000074`. The dialog context/queue/callback lifecycle is now a named-client port; only its retained rendering remains under this Keystone adaptation. | `src/AcDream.App/UI/RetailUiRuntime.cs`; `src/AcDream.App/UI/RetailWindowManager.cs`; `src/AcDream.App/UI/RetainedPanelControllerGroup.cs`; `src/AcDream.App/UI/UiHost.cs`; `src/AcDream.App/UI/RetailWindowLayoutPersistence.cs`; `src/AcDream.App/UI/Layout/RetailWindowFrame.cs`; `src/AcDream.App/UI/Layout/RetailDialogFactory.cs`; `src/AcDream.App/UI/Layout/RetailConfirmationDialogView.cs`; `src/AcDream.App/UI/Layout/LayoutImporter.cs`; binding supply in `GameWindow.cs` | Keystone has no matching PDB/decomp, so we preserve its observable ElementDesc/state/input behavior from DAT, named client call sites, and live evidence while using modern retained ownership. Real RenderSurfaces and imported element geometry remain the visual oracle. | Persistence and low-level widget rendering are behaviorally reconstructed from retail semantics rather than a Keystone byte-port; lifecycle edge cases remain constrained by conformance tests | Production LayoutDesc objects; `DialogFactory @ 0x004773C0..0x00478470`; `docs/research/2026-07-13-retail-dialog-factory-pseudocode.md`; Keystone behavior notes in `docs/research/retail-ui/` |

docs/research/2026-07-17-retail-shared-main-panel-pseudocode.md

@@ -78,6 +78,36 @@ Magic are children of one `gmPanelUI`. The switch changes child visibility;
 there is no child move and no per-panel top-level position. Dragging the parent
 therefore moves the one position subsequently used by every child.
 
+## Resize follow-up
+
+The production end-of-retail LayoutDesc supplies the missing geometry oracle:
+
+```text
+LayoutDesc 0x2100006E
+    gmPanelUI host 0x100005FE            310 x 372
+    content parent 0x10000180            300 x 362, anchored on all edges
+    Inventory child 0x1000018B           300 x 362, anchored on all edges
+    Character child 0x1000018E           300 x 362, anchored on all edges
+    Magic child 0x10000190               300 x 362, anchored on all edges
+
+    top-center 0x1000065C         Type 2 Dragbar, cursor 0x06006119
+    bottom-center 0x10000660      Type 9 Resizebar, cursor 0x06005E66
+```
+
+Every primary child therefore participates in the shared host's vertical
+resize; Magic is not a fixed-height exception. Named
+`gmPanelUI::ResizeTo @ 0x004BC6E0` delegates directly to
+`UIElement::ResizeTo @ 0x00463C30`, whose only size limits are effective DAT
+properties `0x3C..0x3F`. There is no retail 760-pixel Character limit and no
+maximum captured from the host's original screen position.
+
+acdream retains independent wrappers under IA-12, so the faithful adaptation
+is to give each primary wrapper the same bottom-only vertical resize policy,
+leave its maximum unbounded by an authored substitute, and calculate the
+available desktop extent from its current position during the resize. The
+viewport remains the physical limit; an old static maximum must not become a
+smaller limit after the shared panel moves.
+
 ## acdream port shape
 
 acdream imports these child LayoutDesc roots independently, so each currently
@@ -105,7 +135,9 @@ The controller owns this synchronization and subscribes to typed
 `RetailWindowHandle.Moved` events. Toolbar commands, keyboard commands,
 restore-previous effects, persistence restore, and direct window dragging all
 therefore pass through the same owner. Panel-authored size/resize policy stays
-with the active child; only the retail parent placement is shared.
+with the active child, but the three primary wrappers apply the shared host's
+same vertical resize contract; only placement is synchronized between the
+independent frames.
 
 ACE contains no client UI implementation, and the in-tree WorldBuilder
 reference contains no `gmPanelUI` port, so neither supplies a competing

docs/research/2026-07-17-retail-window-control-cursor-pseudocode.md

@@ -0,0 +1,137 @@
+# Retail window-control cursor pseudocode
+
+Date: 2026-07-17
+
+## Question
+
+Which cursors does the end-of-retail client show while hovering or operating
+window dragbars and resizebars, and how are they selected?
+
+## Named-retail mechanism
+
+### Widget cursor ownership
+
+```text
+MediaMachine::Update_Cursor(owner, cursorMedia)       // 0x00465A80
+    if cursorMedia.file is valid
+        owner.SetCursor(file, hotspotX, hotspotY)
+    else
+        owner.UnSetCursor()
+
+UIElement::SetCursor(file, hotspotX, hotspotY)        // 0x0045FF50
+    m_cursorDID = file
+    m_cursorHotX = hotspotX
+    m_cursorHotY = hotspotY
+    UIElementManager.CheckCursor()
+
+UIElementManager::CheckCursor()                       // 0x0045ABF0
+    if mouseCapture != null and mouseCapture.HasCursor()
+        apply mouseCapture cursor
+    else if lastEntered != null and lastEntered.HasCursor()
+        apply lastEntered cursor
+    else
+        apply ClientUISystem default cursor
+```
+
+The important ownership rule is that the captured widget wins. A resize or
+move cursor therefore remains visible after the pointer leaves the original
+five-pixel control while the button is still held.
+
+### Window controls
+
+```text
+UIElement_Resizebar::StartMouseResizing(point)        // 0x0046B7E0
+    parent = GetParent()
+    edge = authored Left/Right/Top/Bottom attributes
+    m_mousePressed = true
+    parent.StartResizing(edge, point.x, point.y)
+    SetState(Pressed)
+
+UIElement_Resizebar::StopMouseResizing()              // 0x0046B8C0
+    SetState(Normal)
+    m_mousePressed = false
+    GetParent().StopResizing()
+
+UIElement_Dragbar::StartMouseMoving(message)          // 0x0046C760
+    if primary mouse button and parent is not already moving/resizing
+        m_mousePressed = true
+        parent.StartMovement(message.windowX, message.windowY)
+        SetState(Pressed)
+
+UIElement_Dragbar::StopMouseMoving(message)           // 0x0046C7C0
+    if pressed and primary mouse button
+        SetState(Normal)
+        m_mousePressed = false
+        GetParent().StopMovement()
+```
+
+Dragbar and Resizebar do not synthesize OS cursors in these methods. Their
+LayoutDesc state media supplies `MD_Data_Cursor`; the generic
+`MediaMachine::Update_Cursor` path above installs it on the element.
+
+## Installed end-of-retail DAT oracle
+
+The production LayoutDesc records and portal DAT resolve these direct cursor
+surfaces, all with hotspot `(16, 16)` pixels:
+
+| Intent | RenderSurface DID | Observed authored use |
+|---|---:|---|
+| Move window | `0x06006119` | Type-2 Dragbar controls |
+| Resize vertically | `0x06005E66` | horizontal Type-9 Resizebar (main chat top edge and combat bottom edge) |
+| Resize horizontally | `0x06006128` | vertical Type-9 Resizebar |
+| Resize NW-SE | `0x06006126` | top-left and bottom-right Type-9 corners |
+| Resize NE-SW | `0x06006127` | bottom-left / opposite diagonal Type-9 corner |
+
+All five surfaces are 32×32 `PFID_A8R8G8B8` cursor images. Representative
+LayoutDesc fixtures independently preserve the same media:
+
+- main chat `0x21000006`, element `0x1000000F`: vertical cursor
+  `0x06005E66` at `(16,16)`;
+- combat `0x21000073`, Dragbar `0x100006AE`: move cursor
+  `0x06006119` at `(16,16)`;
+- combat corner/edge Resizebars: `0x06006126..0x06006128`.
+
+`DatReaderWriter` supplies these cursor records through the existing
+LayoutDesc media decode. WorldBuilder's backend exposes the same architectural
+boundary (`SetCursor(cursorDataId, hotspot)`) but leaves it unimplemented; it
+does not provide a competing behavior interpretation.
+
+## acdream root cause and port
+
+`UiRoot` already computes the active or hovered resize edges and window-move
+ownership. `CursorFeedbackController` already translates those states into
+`WindowMove`, `ResizeHorizontal`, `ResizeVertical`, and the two diagonal
+semantic kinds. However, `RetailCursorManager` renders only a valid
+`UiCursorMedia` override or the `ClientUISystem` global cursor. The semantic
+window-control kind was never converted to media, so synthetic wrapper borders
+and whole-window drag regions retained the normal pointer.
+
+Port shape:
+
+```text
+ResolveWindowControlCursor(kind):
+    WindowMove         -> 0x06006119 @ (16,16)
+    ResizeHorizontal   -> 0x06006128 @ (16,16)
+    ResizeVertical     -> 0x06005E66 @ (16,16)
+    ResizeDiagonalNWSE -> 0x06006126 @ (16,16)
+    ResizeDiagonalNESW -> 0x06006127 @ (16,16)
+
+UpdateCursor(root):
+    kind = resolve semantic interaction state
+    authored = captured-or-hovered element cursor, using retail precedence
+
+    if a synthetic resize edge owns the pointer or a resize/move operation owns capture
+        cursor = ResolveWindowControlCursor(kind)
+    else if authored is valid
+        cursor = authored
+    else
+        cursor = ResolveWindowControlCursor(kind)
+
+    render cursor; otherwise retain the ClientUISystem global cursor
+```
+
+Authored widget media therefore remains the first hover-time oracle. The
+shared fallback exists for retained wrapper borders and the accepted IA-12
+whole-window drag adaptation, which have no authored Dragbar/Resizebar child.
+Once a synthetic operation starts, its control cursor wins just as retail's
+captured Dragbar or Resizebar wins.

src/AcDream.App/UI/CursorFeedbackController.cs

@@ -140,7 +140,9 @@ public sealed class CursorFeedbackController
             CombatMode: _combatModeProvider());
 
         var kind = ResolveKind(snapshot);
-        Current = new CursorFeedback(kind, ResolveCursor(root.Captured, hover), ResolveGlobalKind(snapshot));
+        UiCursorMedia authoredCursor = ResolveCursor(root.Captured, hover);
+        UiCursorMedia cursor = ResolveEffectiveCursor(kind, snapshot, authoredCursor);
+        Current = new CursorFeedback(kind, cursor, ResolveGlobalKind(snapshot));
         return Current;
     }
 
@@ -151,7 +153,13 @@ public sealed class CursorFeedbackController
     }
 
     public CursorFeedback Resolve(CursorFeedbackSnapshot snapshot)
-        => new(ResolveKind(snapshot), GlobalKind: ResolveGlobalKind(snapshot));
+    {
+        CursorFeedbackKind kind = ResolveKind(snapshot);
+        return new(
+            kind,
+            ResolveEffectiveCursor(kind, snapshot, authoredCursor: default),
+            ResolveGlobalKind(snapshot));
+    }
 
     private CursorFeedbackKind ResolveKind(CursorFeedbackSnapshot snapshot)
     {
@@ -310,6 +318,34 @@ public sealed class CursorFeedbackController
         return default;
     }
 
+    private static UiCursorMedia ResolveEffectiveCursor(
+        CursorFeedbackKind kind,
+        CursorFeedbackSnapshot snapshot,
+        UiCursorMedia authoredCursor)
+    {
+        bool syntheticControlOwnsPointer = snapshot.ActiveResizeEdges != ResizeEdges.None
+            || snapshot.HoverResizeEdges != ResizeEdges.None
+            || snapshot.WindowMoveActive;
+
+        // Retail CheckCursor gives the hovered/captured Resizebar or captured
+        // Dragbar first refusal. Our wrapper borders are geometry, not UIElements,
+        // so a hovered synthetic resize edge or active synthetic control must take
+        // that same precedence over the content under its five-pixel hit region.
+        if (syntheticControlOwnsPointer
+            && RetailCursorCatalog.TryGetWindowControlCursor(kind, out UiCursorMedia capturedControl))
+            return capturedControl;
+
+        // Ordinary imported elements retain their authored MD_Data_Cursor exactly.
+        if (authoredCursor.IsValid)
+            return authoredCursor;
+
+        // Synthetic wrapper edges and the IA-12 whole-window drag region have no
+        // authored child, but use retail's exact control media and hotspot.
+        return RetailCursorCatalog.TryGetWindowControlCursor(kind, out UiCursorMedia fallback)
+            ? fallback
+            : default;
+    }
+
     private static UiItemSlot? FindHoveredItemSlot(UiElement? element)
     {
         while (element is not null)

src/AcDream.App/UI/Layout/RetailWindowFrame.cs

@@ -58,6 +58,7 @@ public static class RetailWindowFrame
         public ResizeEdges ResizableEdges { get; init; } =
             ResizeEdges.Left | ResizeEdges.Right | ResizeEdges.Top | ResizeEdges.Bottom;
         public bool ConstrainDragToParent { get; init; }
+        public bool ConstrainResizeToParent { get; init; }
 
         public float Opacity { get; init; } = 1f;
         public bool Visible { get; init; } = true;
@@ -135,6 +136,7 @@ public static class RetailWindowFrame
         outerFrame.ResizeY = options.ResizeY;
         outerFrame.ResizableEdges = options.ResizableEdges;
         outerFrame.ConstrainDragToParent = options.ConstrainDragToParent;
+        outerFrame.ConstrainResizeToParent = options.ConstrainResizeToParent;
         outerFrame.Opacity = Math.Clamp(options.Opacity, 0f, 1f);
         outerFrame.Visible = options.Visible;
 

src/AcDream.App/UI/RetailCursorCatalog.cs

@@ -1,6 +1,11 @@
 namespace AcDream.App.UI;
 
-/// <summary>Retail global cursor enum metadata used outside LayoutDesc widget states.</summary>
+/// <summary>
+/// Retail cursor metadata used outside ordinary LayoutDesc widget-state lookup.
+/// Global cursors resolve through enum table 6; synthetic retained-window control
+/// regions use the exact direct cursor media authored on retail Dragbar/Resizebar
+/// elements.
+/// </summary>
 internal static class RetailCursorCatalog
 {
     public const uint CursorEnumTable = 6;
@@ -32,6 +37,31 @@ internal static class RetailCursorCatalog
 
         return spec.IsValid;
     }
+
+    /// <summary>
+    /// Direct <c>MD_Data_Cursor</c> surfaces authored on retail Type-2 Dragbar and
+    /// Type-9 Resizebar controls. The retained wrapper border has no LayoutDesc
+    /// element of its own, so it uses the same media through this shared seam.
+    /// </summary>
+    public static bool TryGetWindowControlCursor(
+        CursorFeedbackKind kind,
+        out UiCursorMedia cursor)
+    {
+        // MediaMachine::Update_Cursor @ 0x00465A80 installs these element-local
+        // cursor DIDs; UIElementManager::CheckCursor @ 0x0045ABF0 preserves the
+        // captured Dragbar/Resizebar cursor for the complete operation.
+        cursor = kind switch
+        {
+            CursorFeedbackKind.WindowMove => new UiCursorMedia(0x06006119u, 16, 16),
+            CursorFeedbackKind.ResizeHorizontal => new UiCursorMedia(0x06006128u, 16, 16),
+            CursorFeedbackKind.ResizeVertical => new UiCursorMedia(0x06005E66u, 16, 16),
+            CursorFeedbackKind.ResizeDiagonalNwse => new UiCursorMedia(0x06006126u, 16, 16),
+            CursorFeedbackKind.ResizeDiagonalNesw => new UiCursorMedia(0x06006127u, 16, 16),
+            _ => default,
+        };
+
+        return cursor.IsValid;
+    }
 }
 
 internal readonly record struct RetailCursorSpec(uint EnumId, int HotspotX, int HotspotY)

src/AcDream.App/UI/RetailUiRuntime.cs

@@ -546,6 +546,10 @@ public sealed class RetailUiRuntime : IDisposable
                 MinWidth = 200f,
                 ResizeX = true,
                 ResizeY = true,
+                // The imported 9px top Resizebar is deliberately removed by
+                // ChatWindowController. Its replacement top chrome is the move
+                // affordance; only the other three wrapper edges resize.
+                ResizableEdges = ResizeEdges.Left | ResizeEdges.Right | ResizeEdges.Bottom,
                 Opacity = 0.75f,
                 Controller = controller,
                 StateController = controller,
@@ -798,10 +802,12 @@ public sealed class RetailUiRuntime : IDisposable
                 Left = 18f,
                 Top = 18f,
                 Visible = false,
-                Resizable = false,
                 ResizeX = false,
-                ResizeY = false,
+                ResizeY = true,
+                ResizableEdges = ResizeEdges.Bottom,
                 ConstrainDragToParent = true,
+                ConstrainResizeToParent = true,
+                ContentAnchors = AnchorEdges.Left | AnchorEdges.Top | AnchorEdges.Bottom,
                 ContentClickThrough = false,
                 Controller = controller,
             });
@@ -1147,10 +1153,10 @@ public sealed class RetailUiRuntime : IDisposable
                 Chrome = RetailWindowChrome.NineSlice,
                 Left = 540f,
                 Top = 18f,
-                MaxHeight = 760f,
                 ResizeX = false,
                 ResizeY = true,
                 ResizableEdges = ResizeEdges.Bottom,
+                ConstrainResizeToParent = true,
                 Visible = false,
                 ContentAnchors = AnchorEdges.Left | AnchorEdges.Top | AnchorEdges.Bottom,
                 ContentClickThrough = false,
@@ -1233,11 +1239,7 @@ public sealed class RetailUiRuntime : IDisposable
                 ResizeX = false,
                 ResizeY = true,
                 ResizableEdges = ResizeEdges.Bottom,
-                // The old 560px cap left a previously expanded window permanently
+                ConstrainResizeToParent = true,
-                // parked at its maximum. Let it grow to the available screen height.
-                MaxHeight = Math.Max(
-                    root.Height + 2f * RetailChromeSprites.Border,
-                    Host.Root.Height - root.Top),
                 ContentAnchors = AnchorEdges.Left | AnchorEdges.Top | AnchorEdges.Bottom,
             });
         _panelUi.RegisterMainPanel(

src/AcDream.App/UI/RetailWindowManager.cs

@@ -155,8 +155,15 @@ public sealed class RetailWindowManager : IDisposable
         var frame = handle.OuterFrame;
         if (!frame.ResizeX) width = frame.Width;
         if (!frame.ResizeY) height = frame.Height;
-        width = Math.Clamp(width, frame.MinWidth, frame.MaxWidth);
+        float maxWidth = frame.MaxWidth;
-        height = Math.Clamp(height, frame.MinHeight, frame.MaxHeight);
+        float maxHeight = frame.MaxHeight;
+        if (frame.ConstrainResizeToParent && frame.Parent is { } parent)
+        {
+            maxWidth = MathF.Min(maxWidth, parent.Width - frame.Left);
+            maxHeight = MathF.Min(maxHeight, parent.Height - frame.Top);
+        }
+        width = Math.Clamp(width, frame.MinWidth, MathF.Max(frame.MinWidth, maxWidth));
+        height = Math.Clamp(height, frame.MinHeight, MathF.Max(frame.MinHeight, maxHeight));
         if (frame.Width == width && frame.Height == height) return true;
         frame.Width = width;
         frame.Height = height;

src/AcDream.App/UI/UiElement.cs

@@ -188,6 +188,13 @@ public abstract class UiElement
     /// <c>gmRadarUI::MoveTo</c> enables this; most windows retain the toolkit default.</summary>
     public bool ConstrainDragToParent { get; set; }
 
+    /// <summary>
+    /// Clamp resize growth to the current parent extent. This is distinct from
+    /// <see cref="ConstrainDragToParent"/>: retail's shared main-panel host may be
+    /// moved freely, but its bottom resizebar grows only to the desktop edge.
+    /// </summary>
+    public bool ConstrainResizeToParent { get; set; }
+
     /// <summary>If true, a left-drag starting near this element's edge/corner
     /// resizes it (window resize). Intended for top-level panels.</summary>
     public bool Resizable { get; set; }

src/AcDream.App/UI/UiRoot.cs

@@ -341,11 +341,31 @@ public sealed class UiRoot : UiElement
         // Window resize takes precedence over move / drag-drop / hover.
         if (_resizeTarget is not null)
         {
+            float maxWidth = _resizeTarget.MaxWidth;
+            float maxHeight = _resizeTarget.MaxHeight;
+            if (_resizeTarget.ConstrainResizeToParent
+                && _resizeTarget.Parent is { } resizeParent)
+            {
+                // The opposite edge remains fixed during a resize. Limit the
+                // dragged edge to its current parent, using the interaction's
+                // start rect so the clamp remains stable throughout the drag.
+                maxWidth = MathF.Min(
+                    maxWidth,
+                    (_resizeEdges & ResizeEdges.Left) != 0
+                        ? _resizeStartX + _resizeStartW
+                        : resizeParent.Width - _resizeStartX);
+                maxHeight = MathF.Min(
+                    maxHeight,
+                    (_resizeEdges & ResizeEdges.Top) != 0
+                        ? _resizeStartY + _resizeStartH
+                        : resizeParent.Height - _resizeStartY);
+            }
             var (nx, ny, nw, nh) = ResizeRect(
                 _resizeStartX, _resizeStartY, _resizeStartW, _resizeStartH,
                 _resizeEdges, x - _resizeMouseX, y - _resizeMouseY,
                 _resizeTarget.MinWidth, _resizeTarget.MinHeight,
-                _resizeTarget.MaxWidth, _resizeTarget.MaxHeight);
+                MathF.Max(_resizeTarget.MinWidth, maxWidth),
+                MathF.Max(_resizeTarget.MinHeight, maxHeight));
             _resizeTarget.Left = nx; _resizeTarget.Top = ny;
             _resizeTarget.Width = nw; _resizeTarget.Height = nh;
             return;

tests/AcDream.App.Tests/UI/CursorFeedbackControllerTests.cs

@@ -32,17 +32,25 @@ public sealed class CursorFeedbackControllerTests
     }
 
     [Theory]
-    [InlineData(ResizeEdges.Right, CursorFeedbackKind.ResizeHorizontal)]
+    [InlineData(ResizeEdges.Left, CursorFeedbackKind.ResizeHorizontal, 0x06006128u)]
-    [InlineData(ResizeEdges.Bottom, CursorFeedbackKind.ResizeVertical)]
+    [InlineData(ResizeEdges.Right, CursorFeedbackKind.ResizeHorizontal, 0x06006128u)]
-    [InlineData(ResizeEdges.Right | ResizeEdges.Bottom, CursorFeedbackKind.ResizeDiagonalNwse)]
+    [InlineData(ResizeEdges.Top, CursorFeedbackKind.ResizeVertical, 0x06005E66u)]
-    [InlineData(ResizeEdges.Left | ResizeEdges.Bottom, CursorFeedbackKind.ResizeDiagonalNesw)]
+    [InlineData(ResizeEdges.Bottom, CursorFeedbackKind.ResizeVertical, 0x06005E66u)]
-    public void ResizeEdges_chooseExpectedCursor(ResizeEdges edges, CursorFeedbackKind expected)
+    [InlineData(ResizeEdges.Left | ResizeEdges.Top, CursorFeedbackKind.ResizeDiagonalNwse, 0x06006126u)]
+    [InlineData(ResizeEdges.Right | ResizeEdges.Bottom, CursorFeedbackKind.ResizeDiagonalNwse, 0x06006126u)]
+    [InlineData(ResizeEdges.Left | ResizeEdges.Bottom, CursorFeedbackKind.ResizeDiagonalNesw, 0x06006127u)]
+    [InlineData(ResizeEdges.Right | ResizeEdges.Top, CursorFeedbackKind.ResizeDiagonalNesw, 0x06006127u)]
+    public void ResizeEdges_chooseExpectedRetailCursor(
+        ResizeEdges edges,
+        CursorFeedbackKind expected,
+        uint expectedDid)
     {
         var c = new CursorFeedbackController();
 
         var feedback = c.Resolve(new CursorFeedbackSnapshot(HoverResizeEdges: edges));
 
         Assert.Equal(expected, feedback.Kind);
+        Assert.Equal(new UiCursorMedia(expectedDid, 16, 16), feedback.Cursor);
     }
 
     [Fact]
@@ -52,10 +60,93 @@ public sealed class CursorFeedbackControllerTests
 
         Assert.Equal(CursorFeedbackKind.WindowMove,
             c.Resolve(new CursorFeedbackSnapshot(HoverWindowMove: true)).Kind);
+        Assert.Equal(new UiCursorMedia(0x06006119u, 16, 16),
+            c.Resolve(new CursorFeedbackSnapshot(HoverWindowMove: true)).Cursor);
         Assert.Equal(CursorFeedbackKind.Text,
             c.Resolve(new CursorFeedbackSnapshot(HoverTextEdit: true)).Kind);
     }
 
+    [Fact]
+    public void ActiveSyntheticResize_keepsControlCursorOverAuthoredCapturedElement()
+    {
+        var root = new UiRoot { Width = 400, Height = 300 };
+        var window = new UiPanel
+        {
+            Left = 50,
+            Top = 40,
+            Width = 150,
+            Height = 100,
+            Draggable = true,
+            Resizable = true,
+        };
+        var content = new UiPanel { Width = 150, Height = 100 };
+        var authored = new UiCursorMedia(0x06009999u, 3, 4);
+        content.SetStateCursors(new Dictionary<string, UiCursorMedia> { [""] = authored });
+        window.AddChild(content);
+        root.AddChild(window);
+        var controller = new CursorFeedbackController();
+
+        root.OnMouseMove(199, 90); // inside the five-pixel right-edge resizebar region
+        Assert.Equal(new UiCursorMedia(0x06006128u, 16, 16), controller.Update(root).Cursor);
+
+        root.OnMouseDown(UiMouseButton.Left, 199, 90);
+        root.OnMouseMove(100, 90); // leave the edge while resize capture remains active
+
+        CursorFeedback active = controller.Update(root);
+        Assert.Equal(CursorFeedbackKind.ResizeHorizontal, active.Kind);
+        Assert.Equal(new UiCursorMedia(0x06006128u, 16, 16), active.Cursor);
+    }
+
+    [Fact]
+    public void AuthoredWidgetCursor_winsUntilSyntheticWindowMoveStarts()
+    {
+        var root = new UiRoot { Width = 400, Height = 300 };
+        var window = new UiPanel
+        {
+            Left = 50,
+            Top = 40,
+            Width = 150,
+            Height = 100,
+            Draggable = true,
+        };
+        var dragRegion = new UiPanel { Width = 150, Height = 100 };
+        var authored = new UiCursorMedia(0x06008888u, 7, 8);
+        dragRegion.SetStateCursors(new Dictionary<string, UiCursorMedia> { [""] = authored });
+        window.AddChild(dragRegion);
+        root.AddChild(window);
+        var controller = new CursorFeedbackController();
+
+        root.OnMouseMove(100, 90);
+        Assert.Equal(authored, controller.Update(root).Cursor);
+
+        root.OnMouseDown(UiMouseButton.Left, 100, 90);
+        Assert.Equal(new UiCursorMedia(0x06006119u, 16, 16), controller.Update(root).Cursor);
+
+        root.OnMouseMove(300, 200);
+        Assert.Equal(new UiCursorMedia(0x06006119u, 16, 16), controller.Update(root).Cursor);
+    }
+
+    [Fact]
+    public void UiLock_suppressesSyntheticWindowControlCursors()
+    {
+        var root = new UiRoot { Width = 400, Height = 300, UiLocked = true };
+        root.AddChild(new UiPanel
+        {
+            Left = 50,
+            Top = 40,
+            Width = 150,
+            Height = 100,
+            Draggable = true,
+            Resizable = true,
+        });
+        root.OnMouseMove(199, 90);
+
+        CursorFeedback feedback = new CursorFeedbackController().Update(root);
+
+        Assert.Equal(CursorFeedbackKind.Default, feedback.Kind);
+        Assert.False(feedback.Cursor.IsValid);
+    }
+
     [Fact]
     public void TargetMode_reportsValidInvalidAndPendingTargets()
     {

tests/AcDream.App.Tests/UI/Layout/RetailWindowFrameTests.cs

@@ -93,6 +93,7 @@ public sealed class RetailWindowFrameTests
                 ResizeX = false,
                 ResizeY = true,
                 ResizableEdges = ResizeEdges.Bottom,
+                ConstrainResizeToParent = true,
                 ContentAnchors = AnchorEdges.Left | AnchorEdges.Top | AnchorEdges.Right,
                 ContentClickThrough = true,
             });
@@ -101,6 +102,7 @@ public sealed class RetailWindowFrameTests
         Assert.False(frame.ResizeX);
         Assert.True(frame.ResizeY);
         Assert.Equal(ResizeEdges.Bottom, frame.ResizableEdges);
+        Assert.True(frame.ConstrainResizeToParent);
         Assert.True(content.ClickThrough);
         Assert.False(content.Draggable);
         Assert.False(content.Resizable);

tests/AcDream.App.Tests/UI/RetailCursorCatalogTests.cs

@@ -1,6 +1,7 @@
 using AcDream.App.Rendering;
 using AcDream.App.UI;
 using DatReaderWriter;
+using DatReaderWriter.DBObjs;
 using DatReaderWriter.Options;
 using SysEnv = System.Environment;
 
@@ -8,6 +9,47 @@ namespace AcDream.App.Tests.UI;
 
 public sealed class RetailCursorCatalogTests
 {
+    [Theory]
+    [InlineData(CursorFeedbackKind.WindowMove, 0x06006119u)]
+    [InlineData(CursorFeedbackKind.ResizeHorizontal, 0x06006128u)]
+    [InlineData(CursorFeedbackKind.ResizeVertical, 0x06005E66u)]
+    [InlineData(CursorFeedbackKind.ResizeDiagonalNwse, 0x06006126u)]
+    [InlineData(CursorFeedbackKind.ResizeDiagonalNesw, 0x06006127u)]
+    public void WindowControlCursorSpecs_matchRetailLayoutDescMedia(
+        CursorFeedbackKind kind,
+        uint expectedDid)
+    {
+        Assert.True(RetailCursorCatalog.TryGetWindowControlCursor(kind, out var cursor));
+        Assert.Equal(new UiCursorMedia(expectedDid, 16, 16), cursor);
+    }
+
+    [Fact]
+    public void WindowControlCursorSpecs_resolveGoldenDatSurfaces()
+    {
+        string? datDir = ResolveDatDir();
+        if (datDir is null)
+            return;
+
+        using var dats = new DatCollection(datDir, DatAccessType.Read);
+        CursorFeedbackKind[] kinds =
+        [
+            CursorFeedbackKind.WindowMove,
+            CursorFeedbackKind.ResizeHorizontal,
+            CursorFeedbackKind.ResizeVertical,
+            CursorFeedbackKind.ResizeDiagonalNwse,
+            CursorFeedbackKind.ResizeDiagonalNesw,
+        ];
+
+        foreach (CursorFeedbackKind kind in kinds)
+        {
+            Assert.True(RetailCursorCatalog.TryGetWindowControlCursor(kind, out var cursor));
+            Assert.True(dats.Portal.TryGet<RenderSurface>(cursor.File, out var surface), kind.ToString());
+            Assert.NotNull(surface);
+            Assert.Equal(32, surface.Width);
+            Assert.Equal(32, surface.Height);
+        }
+    }
+
     [Theory]
     [InlineData(RetailGlobalCursorKind.Default, 0x01u, 0, 0)]
     [InlineData(RetailGlobalCursorKind.DefaultFound, 0x02u, 0, 0)]

tests/AcDream.App.Tests/UI/RetailWindowManagerTests.cs

@@ -118,6 +118,30 @@ public sealed class RetailWindowManagerTests
         Assert.Equal(1, resized);
     }
 
+    [Fact]
+    public void ProgrammaticResize_ConstrainedToParent_UsesCurrentWindowPosition()
+    {
+        var root = new UiRoot { Width = 800, Height = 600 };
+        var frame = new UiPanel
+        {
+            Left = 40,
+            Top = 125,
+            Width = 300,
+            Height = 200,
+            ResizeX = false,
+            ResizeY = true,
+            ConstrainResizeToParent = true,
+            MinHeight = 100,
+        };
+        root.AddChild(frame);
+        RetailWindowHandle handle = root.RegisterWindow("main-panel", frame);
+
+        Assert.True(handle.ResizeTo(frame.Width, 2_000f));
+
+        Assert.Equal(475f, frame.Height);
+        Assert.Equal(root.Height, frame.Top + frame.Height);
+    }
+
     [Fact]
     public void FocusAndCaptureTransitions_AreScopedToOwningHandle()
     {

tests/AcDream.App.Tests/UI/UiRootInputTests.cs

@@ -349,6 +349,56 @@ public class UiRootInputTests
         root.OnMouseUp(UiMouseButton.Left, 338, 150);
     }
 
+    [Fact]
+    public void BottomResize_ConstrainedToParent_ReachesCurrentScreenEdge()
+    {
+        var root = new UiRoot { Width = 800, Height = 600 };
+        var window = new UiPanel
+        {
+            Left = 100,
+            Top = 80,
+            Width = 300,
+            Height = 200,
+            Draggable = true,
+            Resizable = true,
+            ResizeX = false,
+            ResizeY = true,
+            ResizableEdges = ResizeEdges.Bottom,
+            ConstrainResizeToParent = true,
+            MinHeight = 100,
+        };
+        root.AddChild(window);
+
+        root.OnMouseDown(UiMouseButton.Left, 250, 279);
+        root.OnMouseMove(250, 2_000);
+
+        Assert.Equal(520f, window.Height);
+        Assert.Equal(root.Height, window.Top + window.Height);
+        root.OnMouseUp(UiMouseButton.Left, 250, 2_000);
+    }
+
+    [Fact]
+    public void TopWithoutTopResizeEdge_IsWindowMoveAffordance()
+    {
+        var root = new UiRoot { Width = 800, Height = 600 };
+        var window = new UiPanel
+        {
+            Left = 100,
+            Top = 80,
+            Width = 300,
+            Height = 200,
+            Draggable = true,
+            Resizable = true,
+            ResizableEdges = ResizeEdges.Left | ResizeEdges.Right | ResizeEdges.Bottom,
+        };
+        root.AddChild(window);
+
+        root.OnMouseMove(250, 80);
+
+        Assert.Equal(ResizeEdges.None, root.HoverResizeEdges);
+        Assert.True(root.HoverWindowMove);
+    }
+
     [Fact]
     public void ResizeRect_RightBottom_GrowsSizeOnly()
     {