fix: preserve explicit zero in numeric config defaults and order totals

[paulobernardoaf]

Summary

Replace || fallbacks with ?? in three places where 0 was being silently overridden by the default, because JavaScript's logical OR treats 0 as falsy.

• src/standalone.jsx → mapConfig
  • renderPercentage: passing 0 (intended to hide the widget) was being converted to 100, so the webchat always rendered. Now 0 reaches the service and shouldRender correctly resolves to false.
  • tooltipDelay: passing 0 was being converted to 500, so there was no way to show the tooltip immediately. Now 0 is respected.
• src/components/Messages/MessageOrder.jsx
  • The order total reducer counted product items with quantity: 0 as 1. It now contributes 0, while still defaulting missing/undefined quantities to 1.

Root cause

All three cases relied on value || default, which falls back on any falsy value including 0. Nullish coalescing (value ?? default) only falls back on null/undefined, preserving explicit zeros.

Test plan

• Initialize the widget with renderPercentage: 0 → widget does not render.
• Initialize the widget with renderPercentage: 100 (or omitted) → widget renders as before.
• Initialize the widget with tooltipDelay: 0 and a tooltipMessage → tooltip appears immediately.
• Initialize the widget with tooltipDelay omitted → tooltip still defaults to 500 ms.
• Render MessageOrder with a product_items entry where quantity: 0 → total is 0.
• Render MessageOrder with a product_items entry where quantity is missing → total defaults to 1 per item (existing behavior).

Made with Cursor

[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 66.14%. Comparing base (b014892) to head (f221de3).

Files with missing lines	Patch %	Lines
src/standalone.jsx	0.00%	2 Missing ⚠️
src/components/Messages/MessageOrder.jsx	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #89   +/-   ##
=======================================
  Coverage   66.14%   66.14%           
=======================================
  Files          71       71           
  Lines        3096     3096           
  Branches      837      854   +17     
=======================================
  Hits         2048     2048           
+ Misses       1021     1020    -1     
- Partials       27       28    +1     

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