Re-anchor tradeskill merge bar to real craft starts

EnterTradeskillMerge sized the merged bar as startMs + single*count, a
zero-latency assumption. Each craft boundary actually costs a server
round-trip, so the real chain runs ~(N-1)*lag longer than the bar
assumed. At the clear the overall fill was clamped to full and looked
done, but the fast per-craft spark tracks real time and came up short by
the accumulated lag -- freezing partway on the final craft.

StartTradeskillCraft now re-pins endTime to each craft's real start
(remaining crafts each still take `single`), so on the last craft
remaining==1 and endTime lands on its true completion. The spark and the
overall progress now reach the right edge together.

modules/castbar.lua

@@ -69,6 +69,11 @@ pfUI:RegisterModule("castbar", function ()
   -- spark to the left edge of the bar.
   local function StartTradeskillCraft(cb)
     cb.currentCraftStart = GetTime() * 1000
+    local remaining = cb.tradeskillTotal - (cb.tradeskillCompleted or 0)
+    cb.endTime = cb.currentCraftStart + cb.tradeskillSingleMs * remaining
+    local duration = (cb.endTime - cb.startTime) / 1000
+    cb.bar:SetMinMaxValues(0, duration)
+    cb.lastMax = duration
     UpdateTradeskillLabel(cb)
   end