quak get and get-thumb on an empty cache stop fetching collections once they find the file (closes #222)

`quak get` and `quak get-thumb` used to wait for a refresh, which on an
empty cache fetched the files of every collection. Now, on an empty
cache, `freshFile` reads the collection list, then one collection's
files at a time, and stops at the first that holds the file. That search
stores nothing. Once the cache holds the account's collections,
`freshFile` refreshes as before and looks the file up in the cache. The
commands fetch the content through the new `Library.originalOf()` and
`Library.thumbnailOf()`, which take the file record itself, since the
store may not hold it.

On an empty cache they no longer print a refresh's progress lines. The
`-q` test that relied on `get` refreshing now runs
`helper fix-missing-thumbnails`.

Model: opus-5-5

TODO.md

@@ -26,6 +26,15 @@ declares one.
 
 # Completed Steps
 
+- 2026-10-26: On an empty cache, `quak get` and `quak get-thumb` stop fetching
+  collections' files once they find the file
+  (https://git.eeqj.de/sneak/quak/issues/222). They used to wait for a refresh,
+  which on an empty cache fetched the files of every collection. Now they read
+  the collection list, then one collection's files at a time. They store none of
+  the collections or file records they read, and fetch the original or thumbnail
+  through the new `lib.originalOf()` and `lib.thumbnailOf()`. Once the cache
+  holds the account's collections, they still wait for a refresh.
+
 - 2026-10-26: `quak files` with a collection ID fetches that collection's files
   alone (https://git.eeqj.de/sneak/quak/issues/217). It used to wait for a
   refresh, which on an empty cache fetched the files of every collection. It now