Show the effective backfill rate beside the ETA

CURRENT.md

@@ -52,8 +52,12 @@ mobile draft at 390px.
     scrape, dismisses a paused one on Stop without stopping it, turns red while limited, and shows
     a session-only `N scrapes completed` note. The old `VESKSLOP_MEDIA_*` tuning env vars are gone.
     New unit tests cover batching, the cooldown, live retuning, and queue grouping/finish/pause;
-    the Playwright smoke test covers the Bot tab. Live: daemon restarted, 6018 pending / 13321
+    the Playwright smoke test covers the Bot tab. Also fixed a real stall the queue exposed:
-    cached / 652 failed, ETA 4h 7m at 21.4 rows/min, settings round-trip verified.
+    `pendingPreviews` never returned thumbnail-less embeds, so they sat pending forever and stalled
+    the job; the store now includes them and the resolver handles Discord CDN unfurls through the
+    proxy frame, with a content-type guard so the og:image fallback never reads media bytes. Live:
+    daemon restarted, pending falling (6018 → ~5900), cached rising, dead CDN unfurls closed as 404,
+    jobs queue smallest-first, settings round-trip verified (21.4 → 37.5 rows/min at 30 s cooldown).
   - [x] C42 Preview attempts cap. The restart log showed the backfill retrying dead hosts (Gfycat
     DNS is gone, Streamable answers 400) forever as "transient". Rows now carry
     `preview_attempts`; after `VESKSLOP_MEDIA_PREVIEW_MAX_ATTEMPTS` (3) the row is marked

poc/public/media.js

@@ -563,8 +563,8 @@
             el(
                 "div",
                 "vk-bot-summary-line",
-                `ETA ${formatEta(totals.etaMs)} at ${status.estimatedPerMinute ?? 0} rows/min ` +
+                `ETA ${formatEta(totals.etaMs)} at ${totals.perMinute ?? 0} rows/min ` +
-                    `(current settings)`
+                    `(settings estimate ${status.estimatedPerMinute ?? 0}/min)`
             ),
             el(
                 "div",