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

`quak get` and `quak get-thumb` used to wait for a full refresh, which on
an empty cache fetched the files of every collection. `freshFile` now
reads the collection list, then one collection's files at a time, and
stops at the first that holds the file. It tries first the collections
the cache says hold the file, and stores nothing. 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.

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

test/cli/log.test.ts

@@ -234,13 +234,15 @@ describe("-q", () => {
         });
     });
 
-    // The refresh's progress is left out; the line saying why the command
+    // No album holds file 999, so fixing it fails. The refresh's progress and
+    // the list of failed files are left out. The line saying why the command
     // failed is the fatal one, and it is printed.
     it("prints only the line a failing command exits with", async () => {
-        expect(await quak("-q", "get", "999")).toEqual({
+        const fix = ["helper", "fix-missing-thumbnails", "--file", "999"];
+        expect(await quak("-q", ...fix)).toEqual({
             code: 1,
             stdout: "",
-            stderr: "File 999 not found\n",
+            stderr: `quak: 1 file(s) failed; see the "Failed files:" list, or the JSON with --json\n`,
         });
     });