fix: Sunstrider pin regression, ghost pins, and learner zone normalization

- Fix: isSunstrider block in _MergeSpawnEvidence now checks IsAscensionProtected
  before writing learner data to npcDataOverrides. Without this guard, each Mana
  Wyrm kill overwrote AscensionDB's z1241=5 data with learner z3431 coords.

- Fix: Clustering disabled for zone 1241 (Sunstrider Isle) in _DrawObjectiveIcons
  so all 5 AscensionDB spawn pins display individually instead of collapsing to 2.

- Fix: Ghost pin loop in AvailableQuests.lua -- 'while frames[i]' was iterating a
  string-keyed table with a numeric index (never iterated). Changed to pairs().

- Fix: NormalizeSpawnZoneKey now uses ZoneDB.areaIdToUiMapId for all zones so
  learner evidence is stored under map IDs (e.g. 1241) not area IDs (e.g. 3431),
  matching AscensionDB's key space. Applied in LearnNPC and _StoreGuidSpawnEvidence.

- Fix: isSunstrider detection in _MergeSpawnEvidence updated from hardcoded
  zoneId==3431 check to IsSunstriderNativeZone() since zone IDs are now normalized
  to map IDs at storage time.

Modules/Quest/AvailableQuests.lua

@@ -187,10 +187,9 @@ _CalculateAvailableQuests = function()
 
         if QuestieMap.questIdFrames[questId] then
             -- We already drew this quest so we might need to update the icon (config changed/level up)
+            -- Note: GetFramesForQuest returns string-keyed table, so iterate with pairs not numeric index.
             local frames = QuestieMap:GetFramesForQuest(questId)
-            local i = 1
-            while frames[i] do
-                local frame = frames[i]
+            for _, frame in pairs(frames) do
                 if frame and frame.data and frame.data.QuestData then
                     local newIcon = _GetQuestIcon(frame.data.QuestData)
 
@@ -198,7 +197,6 @@ _CalculateAvailableQuests = function()
                         frame:UpdateTexture(Questie.usedIcons[newIcon])
                     end
                 end
-                i = i + 1
             end
             return
         end