Import lists from CSV or text and match each entry

The list editor gets an Import button. A .csv/.tsv/.txt file or pasted
text is parsed on the server: header columns (Title, Year, Artist or
Director, Note, Rank), numbered lines and trailing "(1999)" years are
understood, and Canon's own export round-trips.

Each row is then searched with the list's provider and scored. A row is
matched automatically only when one result fits exactly and nothing else
fits as well; a year or artist in the file breaks ties, an exact title
beats a bracketed version like "(Live)", and "Artist - Title" lines are
tried both ways. Custom lists need a year or subtitle to be certain.
Everything else is shown for review with a recommended pick, the other
results, "Add as written", Skip, and a search-again box. Entries are
added in file order after the existing ones, with any notes from the
file.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

web/static/js/admin-list.js

@@ -3,6 +3,7 @@ import { h, icon, api, readBoot, toast, confirmDialog, chooseDialog, openDialog,
 import { sortable } from "./sortable.js";
 import { openListForm } from "./list-form.js";
 import { previewButton } from "./player.js";
+import { openImport } from "./import.js";
 
 const boot = readBoot();
 const { categories, limits, productions } = boot;
@@ -261,6 +262,12 @@ async function runRefreshAll(targets, replaceCustomArt) {
 
 document.querySelector("[data-action=refresh-all]")?.addEventListener("click", refreshAll);
 
+document.querySelector("[data-action=import]").addEventListener("click", () => openImport({
+  list, cat,
+  onListChange: (l) => { list = l; renderHeader(); },
+  onDone: () => load(pages()),
+}));
+
 // Songs and albums from Deezer, or matched to Deezer when saved, can play.
 function canPreview(it) {
   return (cat.key === "song" || cat.key === "album") && (it.provider === "deezer" || !!it.extra?.deezer);