When a single source is selected the row's source column is hidden, so the
sidebar now renders 112px (7rem) narrower and the reclaimed space goes to
the preview pane — instead of the sidebar staying the same width and just
widening the title. One stored "base" width drives both modes (wide =
stored, source-selected = stored - 112, floored at 150px); dragging the
splitter in either mode adjusts that base directly, so the width stays
user-settable in whichever mode and the modes track each other by the fixed
offset. Avoids having to re-resize every time you switch modes.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
peter
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