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/Skills.lua

@@ -109,8 +109,7 @@ 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), DS:GetCharacterClass(character)))
-					_G[entry..i.."Level"]:SetText(GREEN .. DS:GetCharacterLevel(character))
+					addon:SetCharacterRowNameLevel(entry, i, icon, character)
 					
 					-- profession 1
 					local field = Characters:GetField(line, "spellID1")
@@ -251,6 +250,7 @@ function ns:OnEnter(frame)
 	local DS = DataStore
 	local character = DS:GetCharacter(Characters:GetInfo(line))
 	local curRank, maxRank = DS:GetSkillInfo(character, skillName)
+	curRank, maxRank = curRank or 0, maxRank or 0		-- CoA: getter returns no value for skills DataStore_Skills hasn't scanned
 	local profession = DS:GetProfession(character, skillName)
 	
 	if (id >= 1) and (id <= 6) then
@@ -268,6 +268,7 @@ function ns:OnEnter(frame)
 		skillName = L["Rogue Proficiencies"]
 		
 		local curLock, maxLock = DS:GetSkillInfo(character, L["Lockpicking"])
+		curLock, maxLock = curLock or 0, maxLock or 0		-- CoA: guard unscanned lockpicking
 		rank = TEAL .. L["Lockpicking"] .. " " .. curLock .. "/" .. maxLock
 		suggestion = addon:GetSuggestion(L["Lockpicking"], curLock)
 	end