Combo highlight config, tooltips, nameplates, hotbars fixes

- Combo highlight: configurable color, glow, line style (solid/dashed/dotted), thickness
- Tooltips: font selection, scaling slider, improved wrap/cramping handling
- Nameplates: custom quest icons with config, position smoothing fix for jitter
- Hotbars: hide keybinds on empty slots, combo highlight within icon bounds
- HudHelper: restore default nameplates on plugin disable

Co-authored-by: Cursor <cursoragent@cursor.com>

Interface/GeneralElements/ActionBarsHud.cs

@@ -177,10 +177,9 @@ namespace HSUI.Interface.GeneralElements
                                     drawList.AddRect(pos, pos + size, 0xFF88CCFF, 0, ImDrawFlags.None, 2);
                                 else if (isComboNext)
                                 {
-                                    const uint gold = 0xFFFFD700;
-                                    for (int g = 5; g >= 1; g--)
-                                        drawList.AddRect(pos - new Vector2(g, g), pos + size + new Vector2(g, g), (uint)((byte)(70 * (6 - g)) << 24 | (gold & 0xFFFFFF)), 0, ImDrawFlags.None, 2f);
-                                    drawList.AddRect(pos, pos + size, gold, 0, ImDrawFlags.None, 4f);
+                                    var ch = Config.ComboHighlightConfig;
+                                    DrawHelper.DrawComboHighlightRect(drawList, pos, pos + size,
+                                        ch.Color.Base, ch.Thickness, ch.ShowGlow, ch.LineStyle);
                                 }
 
                                 if (showCd && slot.CooldownPercent > 0 && _pendingSlotIconIndex != i)
@@ -198,7 +197,7 @@ namespace HSUI.Interface.GeneralElements
                                 }
                             }
 
-                            if (Config.ShowSlotNumbers)
+                            if (Config.ShowSlotNumbers && !slot.IsEmpty)
                             {
                                 string label = !string.IsNullOrWhiteSpace(slot.KeybindHint)
                                     ? slot.KeybindHint