rm-hull / maps / 22247418888

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feat: highlight cheapest fuel prices with rings (#1045)

* refactor: extract PetrolFillingStationPopup

Extracts the popup UI logic from `FuelPricesLayer` into a standalone
component for better modularity.

- Moves helper components like `PricesTable` and `AmenitiesList`.
- Updates `FuelPricesLayer` to use the new component.
- Standardizes data handling using `SearchResult` types.

* feat: highlight cheapest fuel prices with rings

Identify the cheapest **B7_STANDARD** (diesel) and **E10** (petrol)
stations within the visible map bounds.

- Adds a black ring for the cheapest diesel price.
- Adds a green ring for the cheapest petrol price.
- Displays a split ring if a station is the cheapest for both.
- Introduces `gasStationWithRing` in `icons/index.ts` to generate
  dynamic SVG-based `L.DivIcon` markers.

* perf: optimize fuel price calculations

Memoize the logic for determining which petrol stations offer the
lowest prices for diesel and petrol. This prevents re-calculating the
minima on every render cycle of `FuelPricesLayer` unless the source
`results` data changes.

Also improved type safety in `PetrolFillingStationPopup.tsx` by
replacing an `any` type with `DailyOpeningTimes`.

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