chore(wailsv3): migrate frontend to v3 bindings and runtime

Regenerated bindings with wails3 generate bindings (1 service, 29 methods, 25 models) into frontend/bindings/AniTrack as TypeScript; output verified byte-deterministic across regens, so it is committed like wailsjs was.

- 10 Svelte files: wailsjs/go/main/App imports -> import {App} from bindings/AniTrack with App.* call prefixes. No logic or markup changes.
- WebsiteLink.svelte: BrowserOpenURL -> Browser.OpenURL from @wailsio/runtime.
- AvatarMenu.svelte: runtime.Quit -> Application.Quit from @wailsio/runtime.
- package.json: add @wailsio/runtime pinned to 3.0.0-beta.20 (exact, matching the Go framework); lockfile updated, all deps still max in-range, majors deferred.
- Production vite build passes with the new bindings.

frontend/src/App.svelte

@@ -20,11 +20,7 @@
   import { CheckIfAniListLoggedInAndLoadWatchList } from "./helperModules/CheckIfAniListLoggedInAndLoadWatchList.svelte";
   import { CheckIfMALLoggedInAndSetUser } from "./helperModules/CheckIfMyAnimeListLoggedIn.svelte";
   import { CheckIfSimklLoggedInAndSetUser } from "./helperModules/CheckIsSimklLoggedIn.svelte";
-  import {
-    CheckIfAniListLoggedIn,
-    GetMyAnimeList,
-    SimklGetUserWatchlist,
-  } from "../wailsjs/go/main/App";
+  import {App} from "../bindings/AniTrack";
   import { loc } from "svelte-spa-router";
   import ErrorModal from "./helperComponents/ErrorModal.svelte";
 
@@ -49,10 +45,10 @@
         await CheckIfAniListLoggedInAndLoadWatchList();
       }
       if ($malLoggedIn && $malPrimary) {
-        await GetMyAnimeList(1000).then((w) => malWatchList.set(w));
+        await App.GetMyAnimeList(1000).then((w) => malWatchList.set(w));
       }
       if ($simklLoggedIn && $simklPrimary) {
-        await SimklGetUserWatchlist().then((w) => simklWatchList.set(w));
+        await App.SimklGetUserWatchlist().then((w) => simklWatchList.set(w));
       }
 
       watchlistNeedsRefresh.set(false);
@@ -67,7 +63,7 @@
     "/": Home,
     "/anime/:id": wrap({
       asyncComponent: () => import("./routes/AnimeRoutePage.svelte"),
-      conditions: [async () => await CheckIfAniListLoggedIn()],
+      conditions: [async () => await App.CheckIfAniListLoggedIn()],
       loadingComponent: Spinner,
     }),
     // '*': "Not Found"