feat(files): the Downloads page goes — the tray, a Storage tab and a Downloads settings tab take its place

- The Downloads module, its rail icon and badge are gone. A bookmark, the remembered page and an old
  history entry that name it land on Files (urlState.resolvePage); `g d` goes to Files too.
- Users page: a Storage tab — the disk in numbers, every user's use against their own limit with
  their file count, every user's downloads; aligned tables, one menu per row (edit / reset quota,
  open source, copy, the owner's quota). The admin storage rows carry quota + file count, the admin
  job list its owner.
- Settings: a Downloads tab — the download formats in one list (duplicate a built-in, edit or delete
  your own) and the site sign-ins, moved from Account.
- "View" on an added download, a clip or a converting upload opens the tray on that row (unfolded,
  back if closed; a finished one opens as a file; under a player it opens without taking focus).
- The download dialog opens on the format used last.
- DataTable: `pager={false}` for a short list, `cardRow` to give a lone "…" its own card line.
- Welcome and README speak of Files; a new Files screenshot.

frontend/src/components/DownloadDialog.tsx

@@ -11,13 +11,18 @@ import { invalidateDownloads } from "../lib/downloads";
 const ProfileEditor = lazy(() => import("./ProfileEditor"));
 import { notify } from "../lib/notifications";
 import { notifyActionError } from "../lib/actionErrors";
-import { navigateTo } from "../lib/nav";
+import { showInTray } from "../lib/downloadQueue";
 import { profileName } from "../lib/vocab";
+import { LS } from "../lib/storage";
+import { usePref } from "../lib/usePref";
 import FilterSelect from "./ui/FilterSelect";
 import { Input } from "./ui/Input";
 
-// Preset picker shown when the user hits Download on a card / in the player, or adds a URL from
-// the Download Center. Enqueues via the API and points the user at the Download Center.
+// Preset picker shown when the user hits Download on a card / in the player, or brings a link (the
+// Files link box, a paste anywhere). Enqueues via the API; its notice's "View" opens the tray on it.
+// It opens on the format used last (per account): a pasted link is then one Enter away.
+const parseProfile = (v: unknown): number | null => (typeof v === "number" ? v : null);
+
 export default function DownloadDialog({
   source,
   title,
@@ -36,23 +41,30 @@ export default function DownloadDialog({
   const [manage, setManage] = useState(false);
 
   const profiles = profilesQ.data ?? [];
-  const chosen = profileId ?? profiles[0]?.id ?? null;
+  const [lastProfile, setLastProfile] = usePref<number | null>("downloadProfile", null, {
+    localKey: LS.downloadProfile,
+    parse: parseProfile,
+  });
+  // The one used last, while it still exists (a deleted format falls back to the first).
+  const remembered = profiles.some((p) => p.id === lastProfile) ? lastProfile : null;
+  const chosen = profileId ?? remembered ?? profiles[0]?.id ?? null;
 
   const submit = async () => {
     if (!chosen || busy) return;
     setBusy(true);
     const displayName = name.trim() || undefined;
     try {
-      await api.enqueueDownload({
+      const job = await api.enqueueDownload({
         source,
         profile_id: chosen,
         display_name: displayName,
       });
       invalidateDownloads(qc);
+      setLastProfile(chosen);
       notify({
         level: "success",
         message: t("downloads.dialog.added"),
-        action: { label: t("downloads.dialog.view"), onClick: () => navigateTo("downloads") },
+        action: { label: t("downloads.dialog.view"), onClick: () => showInTray(job.id) },
       });
       onClose();
     } catch (e) {