The journald viewer opens in the side panel, but the <pre> only takes
the height of its content — so a short log fetch leaves the bottom 80%
of the panel empty, and a long one pushes the controls past the
viewport. Wrap the body in a column-flex container that fills the
side-panel-body, keep controls fixed at the top, and let the <pre>
flex-grow into the rest of the panel with its own overflow:
.journal-body { display: flex; flex-direction: column; height: 100%; }
.journal-controls { flex: 0 0 auto; }
.journal-output { flex: 1 1 0; min-height: 0; overflow: auto; }
`min-height: 0` is the canonical "let me actually flex-shrink for
overflow" escape hatch on flex children. Also moved the auto-scroll
target from side-panel-body onto the <pre> itself — the panel-body no
longer overflows now that journal-body fills it; the <pre> is the new
scroll surface.
Pure CSS + one JS line; no DOM shape change.
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