Add Wowhead URL to quest log and tracker menus

[liamcooper]

Summary

• Adds a Wowhead URL entry to the retail quest context menus on the map quest log and objective tracker (MENU_QUEST_MAP_LOG_TITLE, MENU_QUEST_OBJECTIVE_TRACKER).
• Opens a compact modal with the quest name, a copyable https://www.wowhead.com/quest=<id>/ link, and a Close button.
• Reuses the tracker skin’s quest icon classification for the modal header via EQT.GetQuestIconAtlas.

Test plan

• /reload, right-click a quest in the map quest log → Wowhead URL appears and opens the modal with the correct link.
• Right-click a quest in the objective tracker → same menu item and modal.
• Ctrl+C copies the URL; Escape and Close dismiss the modal.
• Click outside the modal dismisses it.