fix(frontend): sidebar fill panels overflow with 3+ views open

Key Usage (plus Tasks and Cache Rate) used flex-1 + min-h-0, letting flex
shrink the panel below its content's natural height. The content wrapper was
a plain block, so inner scroll regions never got a bounded height and their
bars/lists spilled into neighbouring panels or past the window edge.

Drop the flex-1 fill entirely: every panel now sizes to its content and the
sidebar's own overflow-y-auto handles scrolling.

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