Fix dpslog dynamic slot search and environmental damage params

Resize hook now expands event array to 801 slots. Dynamic slot search
scans from slot 650 for first empty entry (compatible with SuperWoW).
Fixed ProcessEnvironmentalDamage parameter order — Ghidra mislabeled
damageSource as damage. Lua chat output now fires only on first subevent.

src/dpslog/WeirdUtils_DPSLog/DPSLog.lua

@@ -484,17 +484,16 @@ eventFrame:SetScript("OnEvent", function()
     local subevent = arg1
     if not subevent then return end
 
-    -- Chat output
-    local chatHandler = chatHandlers[subevent]
-    if chatHandler then
-        chatHandler(arg2, arg3, arg4, arg5, arg6, arg7, arg8, arg9, arg10)
-    else
-        DEFAULT_CHAT_FRAME:AddMessage(format("|cffccccccUNHANDLED|r %s", subevent))
-    end
-
     -- Tracker update (first encounter only)
     local idx = subeventIndex[subevent]
     if idx and not seen[idx] then
+        -- Chat output (first occurrence only)
+        local chatHandler = chatHandlers[subevent]
+        if chatHandler then
+            chatHandler(arg2, arg3, arg4, arg5, arg6, arg7, arg8, arg9, arg10)
+        else
+            DEFAULT_CHAT_FRAME:AddMessage(format("|cffccccccUNHANDLED|r %s", subevent))
+        end
         seen[idx] = true
         seenCount = seenCount + 1
         local formatter = argFormatters[subevent]