Add option in UI for configuring Footprint placement (buy right, sell left)

[TrendoBoom]

Feature Request

@kodebuds
Add a new setting in the Chartink UI to allow users to choose how the footprint volumes are displayed next to candles:

• Current Option: Footprint displayed on the right of the candle, showing buy/sell volumes together as now.
• New Option: User can switch to a mode where buy operations are shown to the right of the candle and sell operations are shown to the left. This requires:
  1. Add a toggle/switch in the UI settings panel to choose footprint mode.
  2. When activated, update the chart rendering so buy volumes are always shown right and sell volumes left for each candle (with the ability to revert to the current single-side mode).
  3. Ensure the setting is persisted (saved) per user/chart and can be changed anytime.
  4. If possible, allow color customization for buy/sell display sides in the settings.

Example :

Requirements:

• UI should default to the current mode, and allow switching between the two modes.
• No duplication of existing feature; confirm by checking there's no similar UI option or chart logic now.
• The change should be well documented in the developer docs and README.

References:

• Footprint rendering is currently in static/js/plugins/footprint.js
• Developer docs: [developer.md](https://github.com/kodebuds/chartink/blob/main/developer. md)

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Keywords: UI, enhancement, footprint, buy/sell, settings