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🛡️ Sentinel: [security improvement] Add input length limits to WelcomeScreen#15

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sentinel-input-validation-fix-2653961676200878724
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🛡️ Sentinel: [security improvement] Add input length limits to WelcomeScreen#15
google-labs-jules[bot] wants to merge 1 commit intomainfrom
sentinel-input-validation-fix-2653961676200878724

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Implemented input length limits in WelcomeScreen to prevent Denial of Service (DoS) and API abuse. Added strict maxLength attributes and state validation. Verified with new security-focused tests.


PR created automatically by Jules for task 2653961676200878724 started by @tblakex01

Added `maxLength` attributes and state-level truncation to `WelcomeScreen.tsx` inputs.
This prevents clients from entering excessively large strings (DoS prevention)
and ensures payloads sent to the Gemini API remain within reasonable bounds.

Limits:
- Name: 50 chars
- System Instruction: 2000 chars
- Greeting: 500 chars

Added `tests/security/WelcomeScreenSecurity.test.tsx` to verify limits.
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