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When the sidebar was changed to position:fixed (overlay mode), flex:1
was removed from .main-content. Without flex:1 or an explicit height,
.main-content relied on align-items:stretch for its height constraint.
This is unreliable for establishing a definite height that overflow-y:auto
respects — the element can grow with its content instead of constraining
at 100vh and scrolling.
Add height:100% to .main-content so it has a definite height from the
parent chain (body 100vh → #app 100% → .layout 100% → .main-content 100%).
This ensures overflow-y:auto creates a proper scroll container, which is
required for both the scroll-based infinite loading and mark-as-read to work.
https://claude.ai/code/session_01DpWhB9uGGMBnzqS28HxnuV
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