Two related fixes for the Chats section header:
- The 'manage' label only slid out when the button itself was hovered.
Add section-header-flex:hover to the reveal rule so hovering the sort
icon (or anywhere in the section header) also opens the label.
- Parent-hover opacity bumped 0.45 → 0.85 so the 'manage' text reads
much more clearly when revealed. Direct hover on the button still
pushes to full opacity 1.
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