Improve tooltip graph

At any details screen there's a graph with tooltip that could be improved:


The idea is to insert a line break between the commit name/hash and date, and until now this was tried with no avail.

Solutions tried:
- insertion of `\n` and `
`
- creation of a custom tooltip using this base idea:

```
const CustomItemTooltipContent = props => {
const { itemData, series } = props;
console.log(series);
return (
<>

{series.label}

{series.data[itemData.dataIndex]}

);
};

export const LineChart = ({
labels,
series,
xAxis,
slots,
slotProps,
sx,
onMarkClick,
}: TLineChartProps): JSX.Element => {
return (

);
};

```

Start at the LineChart component shown in the issue and inspect how its tooltip receives the commit name/hash and date. Implement the requested separation in the details-screen graph tooltip, then verify the rendered tooltip on a details screen matches the requested layout.

Written by the indexing model from the issue text.