Show local time on charts without candle duplication during DST

[bludnic]

The previous solution, which involved modifying the date directly, caused a duplicate candle issue during the DST transition. Rolled back the changes. Now the time is in UTC regardless of the client timezone.

https://github.com/bludnic/opentrader-pro/commit/149f45d5abff329b8abef3f7cb6a2cb97e965a3c

[bludnic]

Covered the duplicate candle scenario with tests (currently failing until the fix arrives):

https://github.com/bludnic/opentrader-pro/blob/149f45d5abff329b8abef3f7cb6a2cb97e965a3c/frontend/src/utils/charts/timeToLocal.test.ts

Note: The tests should pass for different timezones including UTC.

[bludnic]

Possible solutions:

1. how to handle timezone and dst? tradingview/lightweight-charts#1189 (comment)
2. How to work/add support with different time zones tradingview/lightweight-charts#781 (comment)
3. How to enable timezone support for time scale? tradingview/lightweight-charts#643 (comment)