Reconcile stale running scrapes and allow per-scrape delete

poc/public/media.js

@@ -1336,6 +1336,28 @@
                             `${formatBytes(bytesById.get(scrape.id) ?? 0)} · files ${scrape.downloaded ?? 0} · previews ${scrape.previewed ?? 0}`
                     )
                 );
+                if (scrape.state !== "running" && scrape.state !== "queued") {
+                    row.append(
+                        button("Delete", async () => {
+                            if (
+                                !window.confirm(
+                                    `Delete scrape ${scrape.id}? This removes its database, downloads, and previews.`
+                                )
+                            ) {
+                                return;
+                            }
+
+                            try {
+                                await window.VK.api.post("/api/media/clean", { ids: [scrape.id] });
+                            } catch (error) {
+                                setStatus(`delete failed: ${error.message}`);
+                            }
+                            void loadScrapes();
+                            void openHistoryModal();
+                        })
+                    );
+                }
+
                 if (["paused", "queued"].includes(scrape.state)) {
                     row.append(
                         button("Resume", async () => {

poc/src/media.ts

@@ -190,6 +190,11 @@ export class MediaService {
             }
         });
 
+        const stale = this.engine.reconcileStaleJobs();
+        if (stale.length) {
+            this.deps.log?.(`paused ${stale.length} stale scrape(s) left running by a previous daemon`);
+        }
+
         // Preview passes only run when a walk ends; fill in scrapes that paused early.
         void this.backfillPreviews();
     }