fix(web): restore independent reader pane scrollbars - #12
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Rebuild the reader panes around a shared ScrollArea contract so the list and detail columns own scrolling inside the fixed shell again. Add SSR and Playwright regression coverage for pane-local overflow, fixed headers, and state preservation, then tune the custom scrollbar styling to stay subtle until hover or active scrolling.
Rebuild the full-height flex chain for placeholder detail states so empty and unavailable views stay vertically centered inside the shared scroll area. Add SSR assertions to guard the placeholder layout contract against future scrollbar refactors.
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Summary
Restores the desktop reader's two-pane scrolling contract so the page no
longer acts as the primary scroll container and both panes keep stable,
discoverable scroll roots.
What changed
with mounted scrollbar structure and stable test hooks
outside the scroll body, and preserve centered placeholder states
and pending or unavailable detail states
reader work
Test plan