🛡️ Sentinel: [MEDIUM] Add input length limits

[google-labs-jules]

🛡️ Sentinel Report: Input Length Limits

Vulnerability: Missing input length limits on user configuration fields (Name, System Instructions, Greeting).
Severity: MEDIUM (DoS risk, potential UI performance issues)
Impact: Malicious actors or accidental usage could inject extremely long strings, potentially causing UI freezes or excessive token usage when passed to the AI model.
Fix:

• Defined strict character limits in constants.ts.
• Enforced limits in WelcomeScreen.tsx (both maxLength attribute and state truncation).
• Added visual feedback (character counters).
  Verification:
• npm test passed (including new tests for truncation).
• Visual verification confirmed character counters and input restriction.

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PR created automatically by Jules for task 17698072626999159545 started by @tblakex01

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