Search (was completely broken):
- wireSearch() registered inside tabChanged for 'learning' tab — runs
after component HTML is in the DOM (lh-search existed but listener
was never attached because element was null at IIFE load time)
- Proper debounced search with 350ms delay, Escape key to clear
- Search results show count, 'X results for "query"', Clear Search button
- Empty state with helpful message; loading state while fetching
Content viewer showing feed items beneath it (CSS cascade bug):
- .lh-feed{display:flex} and .lh-category-bar{display:flex} defined
at CSS lines 513/507 — after .hidden{display:none} at line 242
So classList.add('hidden') was silently overridden
- showFeed() and showViewer() now use element.style.display with
explicit values ('flex'/'block'/'none') which always win over class rules
- viewer started hidden via class="hidden"; now shown with style.display='block'
747fc3322a