[diff view] Add visual clue that the flame graph selection is out of range

[grafakus]

Feature description

Is your feature request related to a problem? Please describe.

When landing on the page, it's not always clear that the flame graph selection is out of range.

Describe the solution you'd like

A warning icon in the time series title, with a tooltip would be enough:

Alternatives considered

Describe alternatives you've considered

-

Additional context

-