fix: tooltip flicker, learner quest field mapping, secondary tooltip style

- QuestieLib.GetColoredQuestName now nil-guards QuestieDB.GetQuest() before reading .isComplete
- TooltipHandler.AddItemDataToTooltip re-keyed on itemId only (was firing on every ElvUI refresh)
- Removed unconditional ResizeTooltip call from item tooltip path (caused first-hover pop)
- OnQuestDetail no longer writes objectives text to data[6] or quest body to data[17] or zoneId to data[8]
- OnQuestAccepted documents why requiredLevel/requiredRaces/requiredClasses are intentionally not captured
- Reused logIdx from data build pass instead of redeclaring it for the objective scan
- Secondary learner tooltip now matches GameTooltip style with or without ElvUI (defers to ElvUI when loaded, replicates its Transparent template otherwise)
- Combined-tooltip learner stats now framed by invisible spacer lines for visual separation

Modules/Tooltips/TooltipHandler.lua

@@ -357,14 +357,7 @@ function _QuestieTooltips:AddItemDataToTooltip()
             string.match(link,
                 "|?c?f?f?(%x*)|?H?([^:]*):?(%d+):?(%d*):?(%d*):?(%d*):?(%d*):?(%d*):?(%-?%d*):?(%-?%d*):?(%d*):?(%d*):?(%-?%d*)|?h?%[?([^%[%]]*)%]?|?h?|?r?"))
     end
-    if name and itemId and (
-            name ~= QuestieTooltips.lastGametooltipItem or
-            (not QuestieTooltips.lastGametooltipCount) or
-            _QuestieTooltips:CountTooltip() < QuestieTooltips.lastGametooltipCount or
-            QuestieTooltips.lastGametooltipType ~= "item" or
-            lastItemId ~= itemId or
-            QuestieTooltips.lastFrameName ~= self:GetName()
-        ) then
+    if name and itemId and (lastItemId ~= itemId) then
         QuestieTooltips.lastGametooltipItem = name
         local tooltipData = QuestieTooltips:GetTooltip("i_" .. (itemId or 0));
         if tooltipData then
@@ -374,9 +367,6 @@ function _QuestieTooltips:AddItemDataToTooltip()
             for _, v in next, tooltipData do
                 self:AddLine(v)
             end
-            if QuestieTooltips.ResizeTooltip then
-                QuestieTooltips:ResizeTooltip(self)
-            end
         end
         QuestieTooltips.lastGametooltipCount = _QuestieTooltips:CountTooltip()
     end