refactor(ui): extract shared helpers into ui_helpers.hpp

DRY up renderAuraRemaining, fmtDurationCompact, classColorVec4,
classColorU32, entityClassId, classNameStr, kDispelNames, and
kRaidMarkNames — duplicated across game_screen, social_panel,
and combat_ui after the panel extraction refactors.

include/ui/ui_helpers.hpp

@@ -0,0 +1,61 @@
+#pragma once
+
+#include <imgui.h>
+#include <cstdint>
+#include <cstdio>
+#include "ui/ui_colors.hpp"
+#include "game/entity.hpp"
+#include "game/update_field_table.hpp"
+#include "game/character.hpp"
+
+namespace wowee::ui::helpers {
+
+// ---- Duration / aura formatting ----
+
+// Format a duration in seconds as compact text: "2h", "3:05", "42"
+inline void fmtDurationCompact(char* buf, size_t sz, int secs) {
+    if (secs >= 3600) snprintf(buf, sz, "%dh", secs / 3600);
+    else if (secs >= 60) snprintf(buf, sz, "%d:%02d", secs / 60, secs % 60);
+    else snprintf(buf, sz, "%d", secs);
+}
+
+// Render "Remaining: Xs" or "Remaining: Xm Ys" in a tooltip (light gray)
+inline void renderAuraRemaining(int remainMs) {
+    if (remainMs <= 0) return;
+    int s = remainMs / 1000;
+    char buf[32];
+    if (s < 60) snprintf(buf, sizeof(buf), "Remaining: %ds", s);
+    else snprintf(buf, sizeof(buf), "Remaining: %dm %ds", s / 60, s % 60);
+    ImGui::TextColored(colors::kLightGray, "%s", buf);
+}
+
+// ---- Class color / name helpers ----
+
+inline ImVec4 classColorVec4(uint8_t classId) { return getClassColor(classId); }
+inline ImU32 classColorU32(uint8_t classId, int alpha = 255) { return getClassColorU32(classId, alpha); }
+
+inline const char* classNameStr(uint8_t classId) {
+    return game::getClassName(static_cast<game::Class>(classId));
+}
+
+// Extract class id from a unit's UNIT_FIELD_BYTES_0 update field.
+// Returns 0 if the entity pointer is null or field is unset.
+inline uint8_t entityClassId(const game::Entity* entity) {
+    if (!entity) return 0;
+    using UF = game::UF;
+    uint32_t bytes0 = entity->getField(game::fieldIndex(UF::UNIT_FIELD_BYTES_0));
+    return static_cast<uint8_t>((bytes0 >> 8) & 0xFF);
+}
+
+// ---- Shared UI data tables ----
+
+// Aura dispel-type names (indexed by dispelType 0-4)
+inline constexpr const char* kDispelNames[] = { "", "Magic", "Curse", "Disease", "Poison" };
+
+// Raid mark names with symbol prefixes (indexed 0-7: Star..Skull)
+inline constexpr const char* kRaidMarkNames[] = {
+    "{*} Star", "{O} Circle", "{<>} Diamond", "{^} Triangle",
+    "{)} Moon", "{ } Square", "{x} Cross", "{8} Skull"
+};
+
+} // namespace wowee::ui::helpers