Upload board: dismiss all, real previews for indexed records

- 'dismiss all' clears every indexed record at once
- Indexed cards show the actual file preview: completed records now get a
  signed library media URL (raw for images, thumbnail for videos) so
  <img>/<video> tags can load it, including items hidden from guests
- Media raw/thumbnail endpoints accept the signature for anonymous
  requests and fall back to the normal guest-filtered path otherwise
- Guest blacklist keeps a persistent Redis mirror: an expired TTL or an
  unreachable e621 keeps the last successful list instead of falling
  back to the small local list

frontend/src/features/upload/UploadPage.tsx

@@ -4,7 +4,7 @@ import {
   UploadCloud,
   X,
 } from "lucide-react";
-import { useRef, useState, type DragEvent } from "react";
+import { useRef, useState, type DragEvent, type ReactNode } from "react";
 import { Link } from "react-router-dom";
 
 import { Button, EmptyState, Spinner, inputClass } from "@/components/ui";
@@ -102,14 +102,15 @@ function TempCard({
   onDismiss: () => void;
 }) {
   const isVideo = /\.(mp4|webm)$/i.test(temp.original_filename);
+  const preview = temp.preview_url ?? temp.file_url;
 
   return (
     <div className="rounded-lg border border-ctp-surface0 bg-ctp-base p-2.5">
       <div className="relative aspect-video overflow-hidden rounded-md bg-ctp-mantle">
-        {temp.file_url ? (
+        {preview ? (
           isVideo ? (
             <video
-              src={temp.file_url}
+              src={preview}
               muted
               playsInline
               preload="metadata"
@@ -117,7 +118,7 @@ function TempCard({
             />
           ) : (
             <img
-              src={temp.file_url}
+              src={preview}
               alt={temp.original_filename}
               loading="lazy"
               className="h-full w-full object-cover"
@@ -125,7 +126,7 @@ function TempCard({
           )
         ) : (
           <div className="flex h-full w-full items-center justify-center text-xs text-ctp-overlay0">
-            {temp.status === "completed" ? "Indexed" : "No preview"}
+            No preview
           </div>
         )}
         {temp.status === "visual_match" && temp.iqdb_data?.length ? (
@@ -303,17 +304,17 @@ function MetadataModal({
 
         <div className="mt-4 grid gap-4 sm:grid-cols-[200px_minmax(0,1fr)]">
           <div className="overflow-hidden rounded-md border border-ctp-surface0 bg-ctp-mantle">
-            {temp.file_url ? (
+            {(temp.preview_url ?? temp.file_url) ? (
               isVideo ? (
                 <video
-                  src={temp.file_url}
+                  src={(temp.preview_url ?? temp.file_url) as string}
                   controls
                   muted
                   className="max-h-52 w-full object-contain"
                 />
               ) : (
                 <img
-                  src={temp.file_url}
+                  src={(temp.preview_url ?? temp.file_url) as string}
                   alt={temp.original_filename}
                   className="max-h-52 w-full object-contain"
                 />
@@ -715,6 +716,15 @@ export default function UploadPage() {
     );
   }
 
+  function dismissAll(items: TempUpload[]) {
+    if (items.length === 0) return;
+    void Promise.allSettled(
+      items.map((temp) =>
+        api(`/api/uploads/${temp.temp_id}/`, { method: "DELETE" }),
+      ),
+    ).then(() => invalidateUploads());
+  }
+
   function clearFinished() {
     setEntries((current) => current.filter((entry) => entry.status !== "done"));
   }
@@ -737,12 +747,16 @@ export default function UploadPage() {
     title: string,
     items: TempUpload[],
     emptyText: string,
+    action?: ReactNode,
   ) => (
     <section className="flex min-w-0 flex-col gap-3">
       <header className="flex items-center justify-between gap-2">
         <h2 className="text-sm font-semibold text-ctp-subtext1">{title}</h2>
-        <span className="font-mono text-[11px] text-ctp-overlay0">
-          {items.length}
+        <span className="flex items-center gap-2">
+          {action}
+          <span className="font-mono text-[11px] text-ctp-overlay0">
+            {items.length}
+          </span>
         </span>
       </header>
       {items.length === 0 ? (
@@ -888,7 +902,21 @@ export default function UploadPage() {
           visual,
           "No IQDB matches right now.",
         )}
-        {column("Auto-uploaded & Indexed", completed, "Nothing indexed yet.")}
+        {column(
+          "Auto-uploaded & Indexed",
+          completed,
+          "Nothing indexed yet.",
+          completed.length > 0 ? (
+            <button
+              type="button"
+              onClick={() => dismissAll(completed)}
+              title="Dismiss every indexed record"
+              className="rounded-md px-1.5 py-0.5 font-mono text-[10px] text-ctp-overlay0 transition hover:bg-ctp-surface0 hover:text-ctp-text"
+            >
+              dismiss all
+            </button>
+          ) : null,
+        )}
       </div>
 
       {modalFor ? (