Fix multiple onboarding UI issues:
1. **ReviewSetupStep interpolation fix:**
- Change single braces {suppliers} to double braces {{suppliers}}
- Fix {ingredients} and {recipes} interpolation to {{ingredients}}, {{recipes}}
- This resolves the issue where raw placeholders were displayed instead of actual values
2. **CompletionStep i18n translations:**
- Add useTranslation hook import
- Replace all hardcoded Spanish text with translation keys
- Add translation support for: welcome message, bakery info, inventory,
AI training, setup guide, next steps sections, and help text
- Properly interpolate bakery name using {{name}} syntax
- Ensures widget works in all 3 supported languages (ES, EN, PT)
3. **Confirmed onboarding steps presence:**
- suppliers-setup step exists (conditional on stockEntryCompleted)
- ml-training step exists (conditional on aiAnalysisComplete)
- Both steps are properly configured in UnifiedOnboardingWizard
These changes ensure proper variable interpolation in i18next and
complete internationalization support for the onboarding completion flow.
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