feat(tooltip): accurate per-pin data source attribution

Re-adds the 'Show data source' tooltip option (General tab, default off),
but accurate this time. The previous version was removed because it
guessed the source from the global data-source mode (showing Learner when
data was AscensionDB, etc.). This tags each pin with its real provenance
at creation and reads that tag.

- QuestieDB.GetPinDataSource(entityType, id, spawnData): resolves
  Learner (per-spawn isLearned or learner record), AscensionDB (curated
  ascensionOverrideKeys override), or base Questie DB. Never guesses.
- Objective pins tagged per-spawn in _DetermineIconsToDraw; available/
  finisher pins defaulted by quest in DrawWorldIcon; manual notes tagged
  Townsfolk in DrawManualIcon.
- World-map pins read the per-pin tag (MapIconTooltip); unit/object/item
  hovers derive per-id at the render layer (TooltipHandler via
  QuestieTooltips:GetDataSourceLine). Comms appended via KeyExists.
- No line shown when source is genuinely unknown (never misleading).

Modules/Map/QuestieMap.lua

@@ -573,6 +573,12 @@ function QuestieMap:DrawManualIcon(data, areaID, x, y, typ)
 
     data.Id = data.id
 
+    -- Manual notes are placed by the Townsfolk / menu system. Tag them so the source
+    -- tooltip line can report it (only if a caller hasn't already set a more specific source).
+    if data.DataSource == nil then
+        data.DataSource = "Townsfolk"
+    end
+
     local uiMapId = _ResolveMapUiMapId(ZoneDB:GetUiMapIdByAreaId(areaID), x, y)
     if (not uiMapId) then
         Questie:Debug(Questie.DEBUG_CRITICAL, "[QuestieMap:DrawManualIcon] No UiMapID for areaId:", areaID, tostring(data.Name))
@@ -714,6 +720,13 @@ function QuestieMap:DrawWorldIcon(data, areaID, x, y, showFlag)
         return nil, nil
     end
 
+    -- Tag data-source provenance for the source tooltip line. Objective pins set this
+    -- explicitly (per-spawn). Available/finisher pins are quest-scoped, so derive from the
+    -- quest. Leave nil for anything else so the tooltip shows no (potentially wrong) source.
+    if data.DataSource == nil and (data.Type == "available" or data.Type == "complete") then
+        data.DataSource = QuestieDB.GetPinDataSource("QUEST", data.Id)
+    end
+
     local uiMapId = _ResolveMapUiMapId(ZoneDB:GetUiMapIdByAreaId(areaID), x, y)
     if (not uiMapId) then
         local parentMapId