perf(ui): cache GetWindowDrawList per frame in SettingsOverview (F7.3)

DrawCard used to call ImGui.GetWindowDrawList once per card, so a frame
with 10 settings cards took 10 draw-list lookups. The list is the same
for every card in the same frame, so Draw() now resolves it once and
passes the pointer down. Pattern parity with ChatLogWindow's frame-local
draw-list handling.

HellionChat/Ui/SettingsOverview.cs

@@ -79,11 +79,13 @@ internal sealed class SettingsOverview
         // 110f accommodates two-line subtexts; wrap width is matched in DrawCard.
         var cardHeight = 110f;
 
+        // One draw-list lookup per frame instead of one per card.
+        var drawList = ImGui.GetWindowDrawList();
         var cardDefs = BuildCardDefs();
         for (var i = 0; i < cardDefs.Length; i++)
         {
             var (icon, title, subtext) = cardDefs[i];
-            DrawCard(i, icon, title, subtext, cardWidth, cardHeight);
+            DrawCard(i, icon, title, subtext, cardWidth, cardHeight, drawList);
 
             if ((i + 1) % columns != 0 && i != cardDefs.Length - 1)
                 ImGui.SameLine();
@@ -96,7 +98,8 @@ internal sealed class SettingsOverview
         string title,
         string subtext,
         float w,
-        float h
+        float h,
+        ImDrawListPtr drawList
     )
     {
         // BeginGroup makes the card a single layout item so SameLine works
@@ -108,8 +111,7 @@ internal sealed class SettingsOverview
         var hovered = ImGui.IsItemHovered();
         var bgColor = hovered ? 0xFF22303Fu : 0xFF1A2538u;
 
-        var draw = ImGui.GetWindowDrawList();
-        draw.AddRectFilled(cursorBefore, cursorBefore + new Vector2(w, h), bgColor, 4f);
+        drawList.AddRectFilled(cursorBefore, cursorBefore + new Vector2(w, h), bgColor, 4f);
 
         var iconPos = cursorBefore + new Vector2(16f, 12f);
         var titlePos = cursorBefore + new Vector2(16f, 40f);
@@ -120,15 +122,15 @@ internal sealed class SettingsOverview
 
         using (_window.Plugin.FontManager.FontAwesome.Push())
         {
-            draw.AddText(iconPos, titleColor, icon.ToIconString());
+            drawList.AddText(iconPos, titleColor, icon.ToIconString());
         }
 
-        draw.AddText(titlePos, titleColor, title);
+        drawList.AddText(titlePos, titleColor, title);
 
         // Subtext wraps at card inner width (16px padding each side) via DrawList
         // to avoid expanding the group bounds and breaking SameLine in the card row.
         var subtextWrapWidth = w - 32f;
-        draw.AddText(
+        drawList.AddText(
             ImGui.GetFont(),
             ImGui.GetFontSize(),
             subtextPos,