Display only selected nozzle efficiency in ship mass charts

[Copilot]

The "Ship mass over time" charts on Constant Acceleration and Flip tabs displayed all 4 nozzle efficiency profiles (70%, 75%, 80%, 85%) instead of showing only the user-selected efficiency.

Changes

• Data generation: Modified generateAccelChartData() and generateFlipBurnChartData() to accept nozzleEfficiency parameter and compute single mass profile instead of 4 fixed profiles
• Chart rendering: Updated createMassRemainingDatasets() to create single dataset with dynamic label showing selected efficiency percentage
• Event handlers: Pass user-selected efficiency value from input field to data generation and chart update functions

Before/After

Before: Chart always showed 4 lines regardless of selected efficiency

After: Chart shows single line matching selected efficiency with dynamic label

Implementation

// Data generation now accepts efficiency parameter
export function generateAccelChartData(
  accelG: number,
  durationDays: number,
  nozzleEfficiency: number  // NEW
): {
  // ...
  properTimeMassRemaining: ChartDataPoint[];  // Single array instead of 4
  // ...
}

// Chart creation uses dynamic label
function createMassRemainingDatasets(
  data: { x: number; y: number }[],
  nozzleEfficiency: number
): ChartDataset[] {
  const efficiencyPercent = Math.round(nozzleEfficiency * 100);
  return [{
    label: `${efficiencyPercent}% Nozzle Efficiency`,  // Dynamic
    data: data,
    // ...
  }];
}

Original prompt

---

This section details on the original issue you should resolve

<issue_title>SHIP MASS OVER TIME Chart single line</issue_title>
<issue_description>In the JavaScript app, on the ‘Constant accel’ and ‘flip’ tabs there is a ‘Ship mass over time’ chart that shows 4 fuel profiles. Those charts should just show the selected nozzle efficiency fuel profiles as a single line.

</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes SHIP MASS OVER TIME Chart single line #83

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