Fix Sunstrider Isle arrow, Tooltip type guard, mapId 946 override

- zoneDB.lua: Add [946] = 3430 to UiMapIdOverrides so GetCurrentZoneId()
  returns 3430 (Sunstrider Isle areaId) even when the game returns uiMapId 946
  (ghost/loading map). Previously 946 had no override, causing zone lookups to
  fall through and return 946 instead of the real zone, breaking arrow distance
  calculation and target filtering.

- QuestieArrow.lua: UpdateNearestTargets uses QuestiePlayer:GetCurrentUiMapId()
  (backed by C_Map.GetBestMapForUnit) for player position. When that returns an
  invalid/ghost map (946/947/0), fall back to ZoneDB lookup via the actual
  zoneId. This ensures the arrow gets real world coordinates regardless of
  whether the world map is open or closed.

  Also includes per-frame debug output when debugArrow profile is enabled.

- Tooltip.lua: Add type guard 'if type(objList) ~= table then break end'
  before iterating learnedNpc[10] and learnedObj[10] in both m_/NPC and o_/object
  paths. Prevents 'attempt to index field questData (a string value)' error
  when the questData field is unexpectedly a string instead of a table.

  The original loop used 'for questId, objList in next, learnedNpc[10]' which
  iterates key-value pairs in insertion order. The _AddToArray helper stores
  values as sequential array elements (tbl[key]=value via table.insert), but
  the iteration was treating it as a questId->objList map. Fixed to use
  ipairs-style iteration with a type check for robustness.

Database/Zones/zoneDB.lua

@@ -49,6 +49,8 @@ local UiMapIdOverrides = {
     [246] = 3713,
     [1415] = 668, -- Eastern Kingdoms (matches Undercity on Ascension)
     [947] = 668,  -- Azeroth (matches Undercity on Ascension)
+    [1241] = 3430, -- Sunstrider Isle (uiMapId 1241 → areaId 3430)
+    [946] = 3430,  -- Sunstrider Isle ghost/loading map → areaId 3430
 }
 local parentZoneToSubZone = {} -- Generated
 local zoneMap = {}             -- Generated