feat(web): settings view for roots and policies

Own route beside library and queues. Roots edit kind, audience, path
and their policy; policies get a form over the real fields — size
bands as number inputs, score and source weights as numbers,
resolution preference and audio/HDR rules as validated lists. Delete
arms before firing; a 409 from a referenced policy or occupied root
surfaces its message.

web/src/main.ts

@@ -52,6 +52,7 @@ import {
   searchTitles,
   type TmdbMovie,
 } from "./search";
+import { settingsMain } from "./settings";
 import "./style.css";
 
 const POLL_MS = 15_000;
@@ -207,7 +208,8 @@ function main() {
   const releases = releasesMain();
   const library = libraryMain(board, releases, views);
   const queues = queuesMain(board, releases, views);
-  views.push(library, queues);
+  const settings = settingsMain(board, views);
+  views.push(library, queues, settings);
   const search = searchMain(board, releases, views);
   // a removed title must not survive on the surface the deck opened over
   releases.setRemoved((parent) => {
@@ -244,6 +246,9 @@ function main() {
       case "queues":
         queues.open();
         break;
+      case "settings":
+        settings.open();
+        break;
       case "search":
         search.restore(route.query);
         break;