feat(library): add source chips to game library

Chips show only when the user has 2 or more sources.
A selected source the user lacks stays visible, so it can be cleared.

README.md

@@ -55,7 +55,7 @@ To Be Played is split into three repositories:
   system setting "reduce motion" or the "Reduce animations" switch in the settings.
 - **Landing page**: next to the community numbers and the top games, three blocks: games per platform, top genres and
   finished games per year of all users.
-- **Library**: status filters, "short games" filter (up to 10 h), search, sorting by playtime, recently seen, newest
+- **Library**: status filters, source filter (Steam, PlayStation, manual; a linked set counts on each of its sources), "short games" filter (up to 10 h), search, sorting by playtime, recently seen, newest
   in library, rating or priority, paging. Each row shows the unlocked achievements.
 - **Editions**: an auditor links the editions of one game (Steam and PS5 copy, remaster, port) for every user. A user
   who owns two or more of a linked set sees "Also in your library" on the details page, an "x2" badge in the library