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/Options/GeneralTab/QuestieOptionsGeneral.lua

@@ -558,6 +558,18 @@ function QuestieOptions.tabs.general:Initialize()
                             Questie.db.profile.learnerTooltipUseSecondary = value
                         end
                     },
+                    showDataSource = {
+                        type = "toggle",
+                        order = 8.605,
+                        name = function() return l10n('Show data source'); end,
+                        desc = function() return l10n('Adds a "Source:" line to NPC, object and map-pin tooltips showing where the data came from (Questie DB, AscensionDB, Learner, Townsfolk, Comms). Only shown when the source is actually known.'); end,
+                        width = 1.5,
+                        disabled = function() return not Questie.db.profile.enableTooltips; end,
+                        get = function() return Questie.db.profile.enableTooltipsSource == true end,
+                        set = function(_, value)
+                            Questie.db.profile.enableTooltipsSource = value
+                        end
+                    },
                     partyOnlyToggle = {
                         type = "toggle",
                         order = 8.61,

Modules/Options/QuestieOptionsDefaults.lua

@@ -87,6 +87,7 @@ function QuestieOptionsDefaults:Load()
             enableTooltipsObjectID = false,
             enableTooltipsQuestID = false,
             enableTooltipsQuestLevel = true,
+            enableTooltipsSource = false,
             showQuestXpAtMaxLevel = true,
             enableTooltipsNextInChain = true,
             learnerTooltips = true,