fix(map): completed quest pins stuck on world map until reload (#9)

Draw-queue race: ProcessQueue processes the world-map and minimap queues
independently. When a frame was unloaded while still queued, its
minimap-queue entry could trigger the deferred Unload first (removing
both icons and clearing _needsUnload), then a later map-queue entry
re-added the world-map icon -- orphaned, since Unload had nil'd the
questIdFrames/_G reference, so it lingered until /reload while the
minimap cleared. Unload now drops the frame's pending draw-queue entries
(new QuestieMap:DequeueFrameDrawCalls) so an unloaded frame can never be
re-added to a map.

Modules/FramePool/QuestieFrame.lua

@@ -327,8 +327,15 @@ end
 function _Qframe:Unload()
     if not self._loaded then
         self._needsUnload = true
+        -- Drop any pending draw-queue entries so this frame can't be re-added to a map
+        -- after it was unloaded while still queued (see DequeueFrameDrawCalls). Without
+        -- this a completed quest's world-map pin could linger until /reload. (#9)
+        QuestieMap:DequeueFrameDrawCalls(self)
         return -- icon is still in the draw queue
     end
+    -- Even when already loaded, the frame may have been re-queued for a redraw; clear those
+    -- pending draw calls so they don't re-add the icon after this unload. (#9)
+    QuestieMap:DequeueFrameDrawCalls(self)
     self._needsUnload = nil
     self._loaded = nil
     --Questie:Debug(Questie.DEBUG_SPAM, "[_Qframe:Unload]")