revert(top-tabs): drop icon prefix — Dalamud default font lacks FontAwesome codepoints

Tofu-squares rendered in-game (verified by Flo 2026-05-05 19:21).
ImGui TabItem labels render in a single font frame; mixed-font
(FontAwesome icon + default font for tab name) is not possible
without Font-Atlas merging at FontManager level — out of scope
for v1.2.0.

Top-Tabs visual modernization is now driven by the Underline-Pill
alone (T6, kept). Sidebar (icon-only) remains the use case where
icons earn their keep. v1.2.0 Akzeptanzkriterium AC1 wird auf
"Top-Tabs haben Pill-Underline" reduziert.

HellionChat/Ui/ChatLogWindow.cs

@@ -1360,13 +1360,7 @@ public sealed class ChatLogWindow : Window
             if (Plugin.WantedTab == tabI)
                 flags |= ImGuiTabItemFlags.SetSelected;
 
-            // v1.2.0 — Icon-Glyph als Prefix vor dem Tab-Namen.
-            // Strategy A: Codepoint einfach in den Label-String einbauen.
-            // Funktioniert wenn Dalamuds Default-Font-Atlas FontAwesome-
-            // Glyphen mit-merged. Falls nicht (Tofu-Square sichtbar),
-            // wechseln wir auf Strategy B mit separatem Icon-Render.
-            var icon = TabIconMapping.Resolve(tab);
-            using var tabItem = ImRaii.TabItem($"{icon.ToIconString()}  {tab.Name}{unread}###log-tab-{tabI}", flags);
+            using var tabItem = ImRaii.TabItem($"{tab.Name}{unread}###log-tab-{tabI}", flags);
             DrawTabContextMenu(tab, tabI);
 
             if (!tabItem.Success)