🛡️ Sentinel: Add centralized input validation for food items

[google-labs-jules]

🛡️ Sentinel: [Security Enhancement] Centralized Input Validation for Food Items

Vulnerability:
The application previously added food items to the state via direct array manipulation or methods lacking robust validation. This allowed potentially malformed data, excessively long strings (DoS/XSS risk), or negative numbers to be stored. Additionally, the RecipeCalculator module attempted to call a non-existent addFoodItem method, causing a functional bug.

Impact:

• Data Integrity: Invalid data (negative calories, missing names) could corrupt the state.
• Security: Lack of length limits on food names could be exploited for DoS or storage exhaustion.
• Stability: The recipe import feature was broken.

Fix:
Implemented a centralized addFoodItem(item, mealType) method in script.js that:

1. Validates input types and meal existence.
2. Normalizes data from various sources (internal, recipe API, meal plans).
3. Sanitizes strings (length limits) and numbers (non-negative constraints).
4. Updates state and UI centrally.
5. Refactored addSelectedFood to delegate to this secure method.

Verification:

• Unit Tests: Added to tests/test-suite.js covering validation failure, success, and normalization.
• Manual/Scripted Verification: Verified via Playwright script that addFoodItem functions correctly in the browser environment.

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PR created automatically by Jules for task 11009527421278379132 started by @Kuldeep2822k

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Project	Deployment	Review	Updated (UTC)
smart_cart	Ready	Preview, Comment	Jan 18, 2026 2:03pm

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