Fix logic for default modelMaxTokens for thinking models

[mrubens]

Context

@ReadyPlayerEmma noticed that even though the thinking models visually default to 16k max tokens in the case where the user hasn't touched the max tokens slider, they were being treated as 128k max tokens in the sliding window calculations.

Implementation

This is the quickest fix of just hardcoding to 16k if undefined like we do elsewhere. Really need to clean this code up though.

---

Important

Fixes default modelMaxTokens for thinking models to 16,384 in Cline.ts and updates tests to verify this behavior.

• Behavior:
  • Fixes default modelMaxTokens for thinking models in Cline.ts to 16,384 if undefined.
• Constants:
  • Introduces DEFAULT_THINKING_MODEL_MAX_TOKENS in model-utils.ts set to 16,384.
• Tests:
  • Updates getMaxTokensForModel.test.tsx to test fallback to DEFAULT_THINKING_MODEL_MAX_TOKENS.
  • Adds tests in model-utils.test.ts to verify behavior for thinking models with undefined modelMaxTokens.

^{This description was created by for da286c4. It will automatically update as commits are pushed.}

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