Trade Analysis:
- Add toggleable equity curve overlays: Account total, By Strategy,
By Symbol, By Day of Week — checkboxes above each chart
- Fix all chart backgrounds to transparent (inherit page theme)
- Fix grid and font colours to work on both dark and light backgrounds
Settings page:
- Full theme control: Dark / Light / Custom radio with Apply button
- Custom mode: colour pickers for accent, page bg, sidebar bg, text,
font selector and base dark/light toggle
- Preview swatches before applying
- Discard / Reset to Dark button
- Text size: Normal / Large (+2px) / Extra Large (+4px) via CSS injection
- inject_theme_css() helper for app.py to apply font size on all pages
- Theme written to .streamlit/config.toml on apply
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