Fix "The thinking budget (52428) is invalid" Gemini 2.5 Pro Preview e…

[cte]

Description

Fixes #4399

I think this has caused issues before; if you check the "Thinking Budget" box and don't change the defaults then we don't end up persisting the custom maxTokens and maxThinkingTokens in your settings. We probably should fix this on the webview side, but we still need to handle the case where these values are undefined in the settings and default to the values that we display in the webview (in this case DEFAULT_HYBRID_REASONING_MODEL_MAX_TOKENS and DEFAULT_HYBRID_REASONING_MODEL_THINKING_TOKENS).

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Important

Fixes Gemini 2.5 Pro Preview thinking budget bug by defaulting to specified token values when settings are undefined and updates tests accordingly.

• Behavior:
  • Fixes thinking budget bug in Gemini 2.5 Pro Preview by defaulting to DEFAULT_HYBRID_REASONING_MODEL_MAX_TOKENS and DEFAULT_HYBRID_REASONING_MODEL_THINKING_TOKENS when settings are undefined in model-params.ts.
  • Ensures reasoning budget does not exceed 80% of maxTokens and is at least 1024 tokens.
• Tests:
  • Updates model-params.spec.ts to test new default behavior and clamping logic for reasoning budget and thinking tokens.
  • Renames model-params.test.ts to model-params.spec.ts for consistency with testing framework.

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[jr]

lgtm