feat: Search results page, gapless removal, UI polish (v1.0.11)

- Add full search results page (/search?q=) with artist, album, song sections
- Fix search results column alignment (fixed-width Format column eliminates per-grid auto-sizing variance)
- Remove experimental gapless playback (caused song skipping and beginning cutoffs)
- Add known limitations to README and CHANGELOG (seeking, DnD reliability)
- Update GitHub Actions to Node.js 24 (checkout@v5, setup-node@v5)
- Add align-items: center to tracklist-header CSS

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/components/LiveSearch.tsx

@@ -69,6 +69,12 @@ export default function LiveSearch() {
           value={query}
           onChange={e => setQuery(e.target.value)}
           onFocus={() => results && setOpen(true)}
+          onKeyDown={e => {
+            if (e.key === 'Enter' && query.trim()) {
+              setOpen(false);
+              navigate(`/search?q=${encodeURIComponent(query.trim())}`);
+            }
+          }}
           aria-autocomplete="list"
           aria-controls="search-results"
           aria-expanded={open}