fix(tracker): show (Complete) and correct level for DB-less custom quests

Quests with no static DB entry (e.g. Ascension custom quest 175206) made
GetColoredQuestName bail out early on a nil name lookup, before it ever
reached the (Complete)/(Failed) suffix logic. The tracker's existing
fallback for that case never added the suffix either, and it computed
level via QuestieLib.GetTbcLevel (static-DB-only), which silently defaults
to level 1 and then gets scaled from that wrong base by Ascension's level
scaling. Since these quests also auto-collapse once complete (hiding the
tracker's other "Quest Complete!" indicator line), the title was the only
place that could show completion status, and it was silently swallowing it.

- QuestieTracker.lua: the "no DB name" fallback branch now appends
  (Complete) under the same collapseCompletedQuests/isMinimizable rule as
  the normal path, and uses the live quest object's own level instead of
  the static-only lookup.
- QuestieQuest.lua (PopulateQuestLogInfo): re-syncs quest.level from a live
  GetQuestLogTitle scan every update, since QuestieDB.GetQuest caches quest
  objects permanently and QuestLogCache never tracked level at all.
- TrackerUtils.lua (GetCompletionText): guards the Description[1] fallback
  against quests that have no top-level Description array, which was
  throwing and aborting that quest's tracker render entirely.

Modules/Tracker/QuestieTracker.lua

@@ -1030,6 +1030,13 @@ function QuestieTracker:Update()
                                 questName = questName .. " (" .. quest.Id .. ")"
                             end
                             coloredQuestName = "|cFFFFFF00" .. questName .. "|r"
+                            -- Fallback quests (e.g. custom server quests not in QuestieDB) skip
+                            -- GetColoredQuestName entirely since it needs a DB name lookup, so they
+                            -- never got the (Complete) suffix DB quests get under the same setting.
+                            if Questie.db.profile.collapseCompletedQuests and isMinimizable then
+                                coloredQuestName = coloredQuestName .. " " ..
+                                    Questie:Colorize("(" .. l10n("Complete") .. ")", "green")
+                            end
                         elseif timedQuest then
                             coloredQuestName = QuestieLib:GetColoredQuestName(quest.Id,
                                 Questie.db.profile.trackerShowQuestLevel, false, false)
@@ -1044,18 +1051,25 @@ function QuestieTracker:Update()
                             -- server quest not yet in the static DB), so GetColoredQuestName
                             -- returned nil -- fall back instead of SetText(nil) blanking the
                             -- title line while its objectives still render normally below it.
-                            -- Level/tag lookups don't require a DB "name" entry, so reuse the
-                            -- same formatting helper as the normal path to keep the "[level]"
-                            -- prefix consistent with quests that do have a DB name.
+                            -- Use the live quest object's own level (kept in sync by
+                            -- QuestieQuest:PopulateQuestLogInfo) instead of QuestieLib.GetTbcLevel,
+                            -- which queries the static DB only: for a quest with no DB entry it
+                            -- silently defaults to level 1, and Ascension's scaling then scales
+                            -- that wrong base instead of the quest's real level.
                             local fallbackName = quest.name or tostring(quest.Id)
-                            if Questie.db.profile.trackerShowQuestLevel then
-                                local level = QuestieLib.GetTbcLevel(quest.Id)
-                                fallbackName = QuestieLib:GetQuestString(quest.Id, fallbackName, level, false)
+                            if Questie.db.profile.trackerShowQuestLevel and quest.level and quest.level > 0 then
+                                fallbackName = QuestieLib:GetQuestString(quest.Id, fallbackName, quest.level, false)
                             end
                             if Questie.db.profile.enableTooltipsQuestID then
                                 fallbackName = fallbackName .. " (" .. quest.Id .. ")"
                             end
                             coloredQuestName = "|cFFFFFF00" .. fallbackName .. "|r"
+                            -- Same suffix rule as the normal (DB) branch -- GetColoredQuestName
+                            -- never got a chance to run since it bailed out on the missing name.
+                            if Questie.db.profile.collapseCompletedQuests and isMinimizable then
+                                coloredQuestName = coloredQuestName .. " " ..
+                                    Questie:Colorize("(" .. l10n("Complete") .. ")", "green")
+                            end
                         end
 
                         line.label:SetText(coloredQuestName)