igloo: let the custom graph designer pan again

Panning was lost when GraphPanel's boolean `interactive` prop gave way
to the Interaction object: DesignerBody never passed the prop, so its
`true` default became a hard-coded `panning: 'disabled'`. Zoom goes
with it, since the header's zoom switch appears for either flag.

The context view now follows useBrushCoordination, as the graph group
already does, so the strip holds still while the window is translated
instead of re-centring on every pan. That drops overviewTimeRange's
last caller: deriving the domain per fetch is what re-centred it.

useBrushCoordination watches the requested range itself now, so neither
consumer repeats that guard, and an overview request equal to the last
completed one is skipped: a pan asks only for the main window.

JIRA-Ref: CMK-37852
Change-Id: Iae723d5ed78ee084a052e220ebec096addce5719