Fix meal category lookup in quick-add

[milldr]

what

• Replace exact text selector (text="Lunch") with targeted element selectors (td:text(), div:text()) for meal category lookup
• Retry when meal category element isn't found instead of failing immediately

why

• The exact text selector failed because Cronometer meal category elements contain additional text (calorie summaries), not just the meal name
• The old retry loop only retried when the right-click succeeded but the context menu didn't appear — if the element wasn't found at all (e.g. GWT still rendering), it returned an error immediately

ref

• Tested with local Playwright backend against live Cronometer