fix: share, upload, crop, auto-skip, tag chips and See all hold what they claim

- Share: a link that expired is never copied (the dialog and one-click Share pick a live one,
  else make one), says it expired, and the copy-on-open claim clears on the next copy.
- A password-protected file link asks to open a file, not to watch a video.
- Upload: Cancel, the close button or the backdrop while naming a folder makes no folder; a failed
  refetch keeps the target; a folder being made says so.
- Crop: an infinite number is dropped, not a 500; an unprobed clip's size follows a shown-size crop;
  the edit_spec docs name frame_w/frame_h; the join and rotated paths are tested.
- Auto-skip: the wait gives way on a marker too short for it, so the skip still fires.
- Tag chips count the followed channels (subscribed_count) and a toggled chip keeps the focus.
- Continue watching's See all sorts by last watched when in progress was already on.

frontend/src/modules/files/VideoEditor.crop.dom.test.tsx

@@ -31,14 +31,18 @@ afterEach(() => {
   vi.restoreAllMocks();
 });
 
+// Wide pixels: stored 960 across, shown 1920 — the browser reports the shown size, the asset the
+// stored one, and the two must not be mistaken for each other.
 const job = {
   id: 7,
   display_name: "Talk",
-  asset: { duration_s: 100, width: 1920, height: 1080, title: "Talk" },
+  asset: { duration_s: 100, width: 960, height: 1080, title: "Talk" },
 } as unknown as DownloadJob;
 
 describe("VideoEditor crop", () => {
   it("sends the size the crop was measured on with it", async () => {
+    vi.spyOn(HTMLVideoElement.prototype, "videoWidth", "get").mockReturnValue(1920);
+    vi.spyOn(HTMLVideoElement.prototype, "videoHeight", "get").mockReturnValue(1080);
     const enqueue = vi
       .spyOn(api, "enqueueEdit")
       .mockResolvedValue({ id: 8 } as unknown as DownloadJob);