Fix search: allow spaces and match multi-word queries as separate words

Space was hard-coded as the global play/pause toggle, so it never reached
the search-typing logic - typing "geolino azte" would toggle playback
instead of adding the space. Now a space is appended to an in-progress
search instead.

Search also required the whole query to be one contiguous substring of
title + artist, which misses queries like "conni rad" for "Conni lernt
Rad fahren" or "geolino azte" for a podcast episode titled "Azteken" by
"GEOlino Spezial" (title comes before artist). Each word is now matched
independently, in any order.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

web/src/lib/keyboard.ts

@@ -208,8 +208,12 @@ export function handleKey(
     if (media) return media;
   }
 
-  // Space is the one other transport key reachable from anywhere, same as Shift+media.
+  // Space is the one other transport key reachable from anywhere, same as Shift+media -
+  // except mid-search, where a space is punctuation the query needs (e.g. "geolino azte").
   if (key === " ") {
+    if (state.page === "music" && state.view === "browse" && state.openAlbumId === null && !state.showHelp && state.search) {
+      return [{ type: "ui", patch: { search: state.search + " ", selIndex: 0 } }];
+    }
     return [{ type: "pop", freq: 340 }, { type: "toggle" }];
   }