fix(downloads): an upload's cancel, progress, failure and notice speak of an upload

- Cancelling an upload asks "Delete upload?" and says the uploaded file is
  removed from the server with it.
- The phone-safe conversion's real ffmpeg % shows as a bar ("Converting for
  phones"), not an indeterminate pulse.
- A failed upload is titled "The upload isn't ready", with its own reasons
  (convert_failed, retryable; upload_missing) instead of download copy.
- The inbox says "Upload ready to share" for a converted upload.

frontend/src/components/useDownloadActions.tsx

@@ -35,6 +35,18 @@ import { menuGroups } from "./ui/menuGroups";
 export type DownloadTab = "queue" | "done" | "shared";
 export type JobOp = "pause" | "resume" | "cancel" | "delete" | "redownload";
 
+// The Cancel confirmation of a queued job; an upload's names what it deletes.
+const CANCEL_DOWNLOAD = {
+  title: "downloads.confirm.cancelTitle",
+  body: "downloads.confirm.cancelBody",
+  action: "downloads.confirm.cancelAction",
+};
+const CANCEL_UPLOAD = {
+  title: "downloads.confirm.cancelUploadTitle",
+  body: "downloads.confirm.cancelUploadBody",
+  action: "downloads.confirm.cancelUploadAction",
+};
+
 export function useDownloadActions({
   onPlay,
   onEdit,
@@ -147,13 +159,14 @@ export function useDownloadActions({
           label: t("downloads.actions.cancel"),
           icon: icon(Ban),
           danger: true,
-          onSelect: () =>
-            void confirmThen(
-              t("downloads.confirm.cancelTitle"),
-              t("downloads.confirm.cancelBody"),
-              t("downloads.confirm.cancelAction"),
-              () => act.mutate({ id: job.id, op: "cancel" }),
-            ),
+          // Cancelling an upload deletes the file it uploaded (there is nothing to fetch again), so
+          // its confirmation says so — "stop the download" would read as safe to undo.
+          onSelect: () => {
+            const copy = job.job_kind === "upload" ? CANCEL_UPLOAD : CANCEL_DOWNLOAD;
+            void confirmThen(t(copy.title), t(copy.body), t(copy.action), () =>
+              act.mutate({ id: job.id, op: "cancel" }),
+            );
+          },
         },
       ],
     );