feat(downloads): edit + remove actions on shared-with-me items (no re-share)

A shared-with-me item only had a download button. Add two actions (Share is intentionally NOT
offered — no chain re-sharing of someone else's file):
- Edit: the editor now accepts an accessible (owned OR shared) source, so editing a shared video
  produces the editor's OWN clip in their library (counts against their quota, fully theirs
  including share); the source file is only read. Route uses _accessible_job.
- Remove from my list: DELETE /api/downloads/shared/{job_id} deletes only the recipient's share
  grant — the owner's job and physical file are untouched (per-user dismissal).
i18n en/hu/de. Verified in a real browser (edit a shared 70-min video → own 2:31 clip; remove
confirm shows 'won't delete the owner's file').

frontend/src/components/DownloadCenter.tsx

@@ -428,6 +428,12 @@ export default function DownloadCenter({ me }: { me: Me }) {
     onSuccess: invalidate,
   });
 
+  // Remove a shared-with-me item from your list (only your grant; the owner's file is untouched).
+  const removeShared = useMutation({
+    mutationFn: (id: number) => api.removeSharedDownload(id),
+    onSuccess: () => qc.invalidateQueries({ queryKey: ["downloads-shared"] }),
+  });
+
   const confirmThen = async (title: string, body: string, fn: () => void) => {
     if (await confirm({ title, message: body, confirmLabel: title, danger: true })) fn();
   };
@@ -545,6 +551,24 @@ export default function DownloadCenter({ me }: { me: Me }) {
           {(sharedQ.data ?? []).map((job) => (
             <DownloadRow key={job.id} job={job}>
               {job.can_download && saveBtn(job)}
+              {job.can_download && (job.asset?.duration_s ?? 0) > 0 && (
+                <IconBtn onClick={() => setEditJob(job)} title={t("downloads.actions.edit")}>
+                  <Scissors className="w-4 h-4" />
+                </IconBtn>
+              )}
+              <IconBtn
+                onClick={() =>
+                  confirmThen(
+                    t("downloads.confirm.removeSharedTitle"),
+                    t("downloads.confirm.removeSharedBody"),
+                    () => removeShared.mutate(job.id)
+                  )
+                }
+                title={t("downloads.actions.removeShared")}
+                danger
+              >
+                <Trash2 className="w-4 h-4" />
+              </IconBtn>
             </DownloadRow>
           ))}
           {sharedQ.data && sharedQ.data.length === 0 && (

frontend/src/i18n/locales/de/downloads.json

@@ -57,7 +57,8 @@
     "download": "Auf mein Gerät speichern",
     "rename": "Umbenennen",
     "share": "Teilen",
-    "edit": "Bearbeiten / schneiden"
+    "edit": "Bearbeiten / schneiden",
+    "removeShared": "Aus meiner Liste entfernen"
   },
   "empty": {
     "queue": "Die Warteschlange ist leer.",
@@ -110,7 +111,9 @@
     "cancelTitle": "Download abbrechen?",
     "cancelBody": "Dies stoppt den Download und entfernt ihn aus deiner Warteschlange.",
     "deleteTitle": "Download entfernen?",
-    "deleteBody": "Dies entfernt ihn aus deiner Liste. Die Datei kann bis zum Ablauf für andere Nutzer im Cache bleiben."
+    "deleteBody": "Dies entfernt ihn aus deiner Liste. Die Datei kann bis zum Ablauf für andere Nutzer im Cache bleiben.",
+    "removeSharedTitle": "Aus deiner Liste entfernen?",
+    "removeSharedBody": "Entfernt es nur aus deiner geteilten Liste — die Datei des Besitzers wird nicht gelöscht."
   },
   "profiles": {
     "manage": "Formate verwalten",

frontend/src/i18n/locales/en/downloads.json

@@ -57,7 +57,8 @@
     "download": "Save to my device",
     "rename": "Rename",
     "share": "Share",
-    "edit": "Edit / trim"
+    "edit": "Edit / trim",
+    "removeShared": "Remove from my list"
   },
   "empty": {
     "queue": "Nothing in the queue.",
@@ -110,7 +111,9 @@
     "cancelTitle": "Cancel download?",
     "cancelBody": "This stops the download and removes it from your queue.",
     "deleteTitle": "Remove download?",
-    "deleteBody": "This removes it from your list. The file may stay cached for other users until it expires."
+    "deleteBody": "This removes it from your list. The file may stay cached for other users until it expires.",
+    "removeSharedTitle": "Remove from your list?",
+    "removeSharedBody": "This removes it from your shared list only — it won't delete the owner's file."
   },
   "profiles": {
     "manage": "Manage formats",

frontend/src/i18n/locales/hu/downloads.json

@@ -57,7 +57,8 @@
     "download": "Mentés a gépemre",
     "rename": "Átnevezés",
     "share": "Megosztás",
-    "edit": "Szerkesztés / vágás"
+    "edit": "Szerkesztés / vágás",
+    "removeShared": "Eltávolítás a listámból"
   },
   "empty": {
     "queue": "A sor üres.",
@@ -110,7 +111,9 @@
     "cancelTitle": "Megszakítod a letöltést?",
     "cancelBody": "Ez leállítja a letöltést és eltávolítja a sorból.",
     "deleteTitle": "Eltávolítod a letöltést?",
-    "deleteBody": "Ez eltávolítja a listádról. A fájl a lejáratáig még a gyorsítótárban maradhat mások számára."
+    "deleteBody": "Ez eltávolítja a listádról. A fájl a lejáratáig még a gyorsítótárban maradhat mások számára.",
+    "removeSharedTitle": "Eltávolítod a listádból?",
+    "removeSharedBody": "Csak a te megosztott listádból tűnik el — a tulajdonos fájlját nem törli."
   },
   "profiles": {
     "manage": "Formátumok kezelése",

frontend/src/lib/api.ts

@@ -1075,6 +1075,9 @@ export const api = {
     req(`/api/downloads/${id}/storyboard`),
   downloads: (): Promise<DownloadJob[]> => req("/api/downloads"),
   downloadsShared: (): Promise<DownloadJob[]> => req("/api/downloads/shared"),
+  // Remove a shared-with-me item from your list (deletes only your share grant, not the file).
+  removeSharedDownload: (jobId: number): Promise<{ removed: number }> =>
+    req(`/api/downloads/shared/${jobId}`, { method: "DELETE" }),
   downloadUsage: (): Promise<DownloadUsage> => req("/api/downloads/usage"),
   downloadIndex: (): Promise<Record<string, DownloadStatus>> => req("/api/downloads/index"),
   pauseDownload: (id: number): Promise<DownloadJob> =>