Show the reserved output tokens in the context window bar

[mrubens]

Context

One thing that's not clear in the context window progress bar is the amount of space that's reserved for the output tokens of the model. I've become particularly nervous about this since we let people extend their max tokens out to 128k tokens with the new thinking models. So, I think we should update the progress bar to give a visual hint about how much the output tokens are limiting their context.

Implementation

This PR computes the amount and percent of the context window that's reserved for output and displays it to the right of the input context.

Screenshots

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Important

Add reserved output tokens display to context window progress bar with supporting logic and tests.

• Feature:
  • Display reserved output tokens in context window progress bar in TaskHeader.tsx.
  • Use calculateTokenDistribution and getMaxTokensForModel from model-utils.ts.
• Logic:
  • calculateTokenDistribution calculates token distribution percentages and sizes.
  • getMaxTokensForModel determines max tokens based on model and API config.
• Tests:
  • Add ContextWindowProgress.test.tsx for rendering tests.
  • Add ContextWindowProgressLogic.test.ts for logic tests.
  • Add getMaxTokensForModel.test.tsx for utility function tests.

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[cte]

Wow - looks great!

[ellipsis-dev]

Several inline style objects (e.g., for the overlay divs) are repeated. Consider extracting these common styles into constants or CSS classes to improve maintainability.