fix(web): subscribe from a TMDB candidate by creating the entity first

The search page 订阅 button and the new-subscription wizard threw away
the TMDB id and created a title-only subscription, which stays pending
(metadata_pending) with no seasons, episode totals or coverage matrix
until some release happens to be identified. Call
/files/entity-from-candidate first and subscribe the entity; fall back
to title tracking only if that fails. Picking a TMDB row in the wizard
now creates the library entity even if the dialog is then cancelled
(idempotent per TMDB id).

Found in REAL-1b on the v0.2.2 test stack; needs an image rebuild to
take effect.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

apps/web/app/components/subscriptions/subscription-form.tsx

@@ -13,6 +13,7 @@ import { ExternalLink, Search, X } from "lucide-react";
 import { type ReactNode, useEffect, useId, useMemo, useState } from "react";
 import { Link } from "react-router";
 import { toast } from "sonner";
+import { useEntityFromCandidate } from "~/api/files.ts";
 import { downloaders, useSiteOptions } from "~/api/instances.ts";
 import { useEntityDetail, useLibraryRoots } from "~/api/library.ts";
 import { usePolicyRevisions } from "~/api/policies.ts";
@@ -141,11 +142,19 @@ function WorkPicker({ onPick, error }: { onPick: (t: Target) => void; error?: st
       year: h.entity.year,
       mediaKind: toSubKind(h.entity.kind),
     });
-  const pickTmdb = (c: TmdbCandidate) =>
-    c.localEntityId
+  const entity = useEntityFromCandidate();
+  const pickTmdb = async (c: TmdbCandidate) => {
+    // 库里没有:先按 TMDB id 建档(季/集与总集数随之就位),失败才退回按标题追踪
+    const id =
+      c.localEntityId ??
+      (await entity
+        .mutateAsync({ provider: "tmdb", externalId: c.externalId, kind: c.entityType === "movie" ? "movie" : "tv" })
+        .then((r) => r.mediaEntityId)
+        .catch(() => null));
+    return id
       ? onPick({
           kind: "entity",
-          id: c.localEntityId,
+          id,
           title: c.title,
           year: c.year,
           mediaKind: c.entityType === "movie" ? "movie" : "series",
@@ -154,8 +163,9 @@ function WorkPicker({ onPick, error }: { onPick: (t: Target) => void; error?: st
           kind: "title",
           titleQuery: c.year ? `${c.title} ${c.year}` : c.title,
           mediaKind: c.entityType === "movie" ? "movie" : "series",
-          note: `TMDB ${c.externalId}，建档后自动关联`,
+          note: `TMDB ${c.externalId}，建档失败，按标题追踪`,
         });
+  };
   const row = (key: string, main: ReactNode, sub: string, onClick: () => void) => (
     <li key={key}>
       <button
@@ -405,7 +415,7 @@ export function SubscriptionFormDialog({
         <DialogHeader>
           <DialogTitle>{editing ? "编辑订阅" : "新建订阅"}</DialogTitle>
           <DialogDescription>
-            {editing ? titleText : "从媒体库或 TMDB 选作品；库里没有的按标题追踪，建档后自动关联。"}
+            {editing ? titleText : "从媒体库或 TMDB 选作品；选 TMDB 条目会先建档。"}
           </DialogDescription>
         </DialogHeader>
         {dup ? (