coa.5: refactor char display into guarded helpers; fix missed sites; restore login scan

- Extract AddCharacterTooltipHeader() + SetCharacterRowNameLevel() (Altoholic.lua);
  nil-guards centralized, callers in AccountSummary/Activity/BagUsage/Skills/tooltip.
- Fix sites the manual sweep missed: Skills.lua (row + skill ranks), Keys.lua x3,
  ShowClassIcons sort (Altoholic.lua:705, getters bypass their own or-0 via the wrapper).
- Restore login scan: OnPlayerAlive was ghost-only (fdcb25a) so iLvl never populated;
  now scans once per session. Removed dated DEBUG leftovers.

Altoholic/Frames/BagUsage.lua

@@ -96,8 +96,7 @@ function ns:Update()
 					_G[entry..i.."Name"]:SetWidth(170)
 					_G[entry..i.."Name"]:SetPoint("TOPLEFT", 10, 0)
 					_G[entry..i.."NameNormalText"]:SetWidth(170)
-					_G[entry..i.."NameNormalText"]:SetText(icon .. format("%s (%s)", DS:GetColoredCharacterName(character) or "?", DS:GetCharacterClass(character) or ""))
-					_G[entry..i.."Level"]:SetText(GREEN .. (DS:GetCharacterLevel(character) or 0))
+					addon:SetCharacterRowNameLevel(entry, i, icon, character)
 
 					_G[entry..i.."FreeBags"]:SetText(GREEN .. (DS:GetNumFreeBagSlots(character) or 0))
 					_G[entry..i.."FreeBank"]:SetText(GREEN .. (DS:GetNumFreeBankSlots(character) or 0))
@@ -182,9 +181,7 @@ function ns:OnEnter(self)
 	
 	AltoTooltip:ClearLines();
 	AltoTooltip:SetOwner(self, "ANCHOR_RIGHT");
-	AltoTooltip:AddDoubleLine(DS:GetColoredCharacterName(character), DS:GetColoredCharacterFaction(character))
-	AltoTooltip:AddLine(format("%s %s |r%s %s", L["Level"],
-		GREEN..(DS:GetCharacterLevel(character) or 0), DS:GetCharacterRace(character) or "",	DS:GetCharacterClass(character) or ""),1,1,1)
+	addon:AddCharacterTooltipHeader(character)
 	AltoTooltip:AddLine(" ",1,1,1);
 
 	local id = self:GetID()