🛡️ Sentinel: [HIGH] Add input and history limits to prevent DoS

[google-labs-jules]

🛡️ Sentinel: [HIGH] Add input and history limits to prevent DoS

Vulnerability:
The application was susceptible to Denial of Service (DoS) and memory exhaustion risks due to:

1. Unlimited input lengths in WelcomeScreen (allowing massive payloads).
2. Unbounded growth of the transcription array in CallScreen during long sessions.

Fix:

• Defined MAX_INPUT_LENGTHS (Name: 50, Instructions: 2000, Greeting: 500) and MAX_TRANSCRIPTION_HISTORY (100 entries) in constants.ts.
• Enforced maxLength on WelcomeScreen input fields.
• Implemented slicing of transcription history in CallScreen to keep only the most recent 100 entries.
• Added unit tests to verify these limits.

Verification:

• pnpm test passed successfully.
• Verified code changes ensure inputs are truncated and history size is capped.

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PR created automatically by Jules for task 3062815038576282386 started by @tblakex01

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