quak helper fix-missing-thumbnails --file on an empty cache stops fetching collections once it finds every file (closes #223)

`helper fix-missing-thumbnails --file` used to wait for a refresh, which
on an empty cache fetched the files of every collection. It now finds the
named files through the new `freshFilesByID` in `src/cli-read.ts`, by the
rule `freshFile` follows. On an empty cache it reads the collection list,
then one collection's files at a time, and stores none of the collections
or file records it reads. It searches the most recently updated
collection first. So a file in several albums is still named after the
first of them that `Library.albums.list()` lists. `fixMissingThumbnails`
now takes the records the command found, and fetches each original
through `lib.originalOf()`.

Model: opus-5-5

test/cli/read.test.ts

@@ -284,6 +284,23 @@ describe("CLI read helpers (issue #36 amendment, issue #52)", () => {
         expect(found.get(20)?.collection.id).toBe(2);
     });
 
+    // Collection 1 was updated last, though collections 2 and 3 have higher
+    // IDs. File 11 is in collections 1 and 2.
+    it("freshFilesByID on an empty cache reads the most recently updated collection first, though its ID is the lowest", async () => {
+        const lib = new FakeLibrary(
+            [collection(1, 400), collection(2, 200), collection(3, 300)],
+            [
+                file(11, 1, 1_700_000_000_000_001),
+                file(11, 2, 1_700_000_000_000_001),
+            ],
+        );
+
+        const found = await freshFilesByID(lib, [11]);
+        expect(lib.freshFilesCalls).toEqual([1]);
+        expect(found.get(11)?.collection.id).toBe(1);
+        expect(found.get(11)?.file.collectionID).toBe(1);
+    });
+
     // The stand-in's cache holds what the server holds once `fresh()` has run.
     it("freshFilesByID on a cache that holds the collections refreshes, then finds each file in the most recently updated collection that holds it", async () => {
         const lib = fileInTwoCollections();