replace poll-until-cancel OnUpdate frames with C_Timer / RunNextFrame

Seven ad-hoc OnUpdate handlers were only spinning long enough to reach
a known deadline or a next-frame defer, then unhooking themselves.
Convert them to their proper primitives:

- autovendor: 0.3s wait after junk sell → C_Timer.After(0.3, ...)
- innervatecall: cooldown-expiry ready ping → C_Timer.After(cd, ...)
- focus: re-arm UI_ERROR_MESSAGE next tick → RunNextFrame
- macrotweak: conflict scan after addons load → RunNextFrame
- ui-widgets (CreateQuestionDialog): font-measure resize → RunNextFrame
- libdebuff: post-PEW Nampower init → RunNextFrame
- bubbles: WorldFrame scan after chat event → RunNextFrame

Net -18 lines and no more throwaway frames sitting on the OnUpdate list.

api/ui-widgets.lua

@@ -1172,10 +1172,9 @@ function pfUI.api.CreateQuestionDialog(text, yes, no, editbox, onclose)
   local width = 200
 
   -- delay the auto sizing, to make sure the font rendering happened
-  question:SetScript("OnUpdate", function()
+  RunNextFrame(function()
     if question.text:GetStringWidth() > width then width = question.text:GetStringWidth() end
-    question:SetWidth( width + 2*padding)
-    this:SetScript("OnUpdate", nil)
+    question:SetWidth(width + 2*padding)
   end)
 end