fix(files): review round 1, the page — honest states, the keyboard, the tray's words

- A library past the list's cap is searched and sorted on the server; the count says "the newest".
- Each folder and each search opens on its first page (DataTable pageScope, useCardPager scope).
- A file dropped where the page takes none never reaches the browser (which would unload the app).
- The viewer's arrows wait while a layer opened from it is on top, and scroll a wide text line;
  a text shows its first 5000 lines and says where the rest is.
- Confirms name the file (no more "your downloads"); the asking menu rows end in "…".
- The tray names a running step beside its bar, shows a pause mark for paused work, polls slowly
  while only paused work waits, and forgets a finished file that was deleted.
- An unchanged rename sends nothing; a paste opens the download dialog only with nothing on top;
  the link box never replaces what was typed.
- Honest states: folders that failed to load, a file no longer there, the storage figure; the rail
  says "nothing downloaded" only when there is nothing.
- Focus after deleting the open folder and when the format form opens; the format name's label.
- ui/Meter (one danger line for both quota bars) and ui/RenameField in the platform layer.
- Copy fixes, stale comments and the speculative hub key; a contract test for the list's
  parameters; e2e: the Files page and the paste intake.

frontend/src/lib/downloadQueue.dom.test.ts

@@ -6,6 +6,7 @@ import { beforeEach, describe, expect, it } from "vitest";
 import type { QueueJob } from "./api";
 import {
   clearFinished,
+  forgetFinished,
   noteQueue,
   resetQueueWatch,
   takeUnannounced,
@@ -47,4 +48,11 @@ describe("downloadQueue · a finish", () => {
     clearFinished();
     expect(finishedIds()).toEqual([]);
   });
+
+  it("a finished file deleted since leaves the tray: its Open and Copy link would reach nothing", () => {
+    noteQueue([job(1, "running"), job(2, "running")]);
+    noteQueue([job(1, "done"), job(2, "done")]);
+    forgetFinished(1);
+    expect(finishedIds()).toEqual([2]);
+  });
 });