Improve strategy performance chart in strategy tile

[kenkunz]

Goal

As a strategy admin, I want the strategy performance chart displayed on strategy tiles to be optimized, so that prospective investors can properly evaluate the investment opportunity.

Background

See discord thread.

Per @tsorro – key considerations to represent the data in a way that is better from a marketing perspective:

• ideally, show green equity curve 📈😄
• show movement – problematic when strategy shows no performance movement for long timeframe
  • potential solution: on a per-strategy basis, start with 90 days; "widen" the chart timeframe if performance is too flat; try steps of 90 days, 180 days, 360 days, "max"
• consider including benchmarks if this can be done in performant way (technically) without making the design too cluttered / overloaded
• keep charts as easy to read as possible

Separate from the frontend / design issue, the charts currently do not include unrealised profits on credit positions. Fixing this would help address "flatline" issue and more accurately reflect the performance. See tradingstrategy-ai/trade-executor#1101