feat(payload-handler): add skeleton with 7-param ctor + Draw() popup tick

Replaces the 15-LOC C2 forward-stub with the full PayloadHandler
skeleton. Class header flips to `internal sealed` per §4.1; ctor takes
7 DI-registered services (ThemeRegistry, IpcManager, GameFunctions,
InputBar, MainWindow, ChunkRenderer, ILogger) per Flo decision
2026-05-27 (ChunkRenderer was added to the ctor list to satisfy the
§4.2 _chunkRenderer.DrawChunks references in HoverStatus/HoverItem/
DrawItemPopup paths — those land in E2-E5).

Draw() per-frame popup tick is a 1:1 port from v1.5.6 PayloadHandler.
DrawPopups() call is stubbed as TODO(E2) since that method lands in E2.
Hover/Click signatures remain empty (E5 fills the bodies, but the
signatures must compile so ChunkRenderer + ImGuiUtil callers stay live).

Skeleton-only — DrawPopups/Integrations (E2), DrawPlayerPopup (E3),
DrawItemPopup/DrawStatusPopup (E4), Hover/Click bodies (E5),
MoveTooltip (E6) all defer to their respective sub-sub-tasks.

HellionChat/PayloadHandler.cs

@@ -1,15 +1,66 @@
 using Dalamud.Bindings.ImGui;
 using Dalamud.Game.Text.SeStringHandling;
+using HellionChat.Themes;
+using HellionChat.Ui.Components;
+using HellionChat.Ui.Windows;
+using Microsoft.Extensions.Logging;
 
 namespace HellionChat;
 
-// TODO(E): full PayloadHandler implementation — click/hover routing, tooltip
-// positioning, party-finder and URI handling. This forward-stub exists only to
-// satisfy the DrawChunks/DrawChunk and ImGuiUtil.PostPayload signatures while
-// Sub-Task E is pending.
-public sealed class PayloadHandler
+internal sealed class PayloadHandler
 {
+    private const string PopupId = "hellionchat-context-popup";
+
+    private readonly ThemeRegistry _themes;
+    private readonly IpcManager _ipc;
+    private readonly GameFunctions.GameFunctions _functions;
+    private readonly InputBar _inputBar;
+    private readonly MainWindow _mainWindow;
+    private readonly ChunkRenderer _chunkRenderer;
+    private readonly ILogger<PayloadHandler> _logger;
+
+    public bool HandleTooltips;
+    public uint HoveredItem;
+    public uint HoverCounter;
+    public uint LastHoverCounter;
+
+#pragma warning disable CS0169 // used in DrawPopups (E2)
+    private (Chunk, Payload?)? _popup;
+#pragma warning restore CS0169
+
+    public PayloadHandler(
+        ThemeRegistry themes,
+        IpcManager ipc,
+        GameFunctions.GameFunctions functions,
+        InputBar inputBar,
+        MainWindow mainWindow,
+        ChunkRenderer chunkRenderer,
+        ILogger<PayloadHandler> logger
+    )
+    {
+        _themes = themes;
+        _ipc = ipc;
+        _functions = functions;
+        _inputBar = inputBar;
+        _mainWindow = mainWindow;
+        _chunkRenderer = chunkRenderer;
+        _logger = logger;
+    }
+
+    internal void Draw()
+    {
+        // TODO(E2): DrawPopups();
+
+        if (HandleTooltips && ++HoverCounter - LastHoverCounter > 1)
+        {
+            GameFunctions.GameFunctions.CloseItemTooltip();
+            HoveredItem = 0;
+            HoverCounter = LastHoverCounter = 0;
+            HandleTooltips = false;
+        }
+    }
+
     internal void Hover(Payload payload) { }
 
-    internal void Click(Chunk chunk, Payload? payload, ImGuiMouseButton button) { }
+    internal unsafe void Click(Chunk chunk, Payload? payload, ImGuiMouseButton button) { }
 }