Migrate all IPC call sites to typed tauri-specta commands.*

Replace the remaining ~155 untyped invoke() calls across stores, services,
components, and routes with the generated commands.* wrappers from
$lib/api/bindings, so every IPC call is compile-time-checked against the
command signatures.

- Register repository_get_subtitle_url and repository_get_video_download_url
  in specta_builder() and the invoke_handler; regenerate bindings.ts.
- Source duplicated wire types (AutoplaySettings, CacheConfig, Session,
  ConnectivityStatus, audio/video settings, etc.) from bindings.
- Fix two bugs surfaced by the typed wrappers:
  - VideoDownloadButton passed an un-awaited Promise as the stream URL.
  - setAutoplaySettings omitted the required userId argument.
- Update unit tests asserting the old invoke(name, args) shape.
- Remove the five param-naming guard tests; the compiler and codegen now
  enforce what they checked.

svelte-check: 0 errors. vitest: green. cargo test --lib: green.

src/routes/library/[id]/+page.svelte

@@ -2,7 +2,7 @@
   import { onMount, untrack } from "svelte";
   import { page } from "$app/stores";
   import { goto } from "$app/navigation";
-  import { invoke } from "@tauri-apps/api/core";
+  import { commands } from "$lib/api/bindings";
   import type { MediaItem, Library } from "$lib/api/types";
   import { library, libraryItems, isLibraryLoading, currentLibrary, libraries } from "$lib/stores/library";
   import { auth } from "$lib/stores/auth";
@@ -221,14 +221,11 @@
         const repo = auth.getRepository();
         const repositoryHandle = repo.getHandle();
         const firstTrack = $libraryItems[0];
-        await invoke("player_play_album_track", {
-          repositoryHandle,
-          request: {
-            albumId: item.id,
-            albumName: item.name,
-            trackId: firstTrack.id,
-            shuffle: false,
-          },
+        await commands.playerPlayAlbumTrack(repositoryHandle, {
+          albumId: item.id,
+          albumName: item.name,
+          trackId: firstTrack.id,
+          shuffle: false,
         });
       } catch (e) {
         console.error("Failed to play album:", e);
@@ -248,14 +245,11 @@
         const repositoryHandle = repo.getHandle();
         // Pick a random track to start with
         const randomTrack = $libraryItems[Math.floor(Math.random() * $libraryItems.length)];
-        await invoke("player_play_album_track", {
-          repositoryHandle,
-          request: {
-            albumId: item.id,
-            albumName: item.name,
-            trackId: randomTrack.id,
-            shuffle: true,
-          },
+        await commands.playerPlayAlbumTrack(repositoryHandle, {
+          albumId: item.id,
+          albumName: item.name,
+          trackId: randomTrack.id,
+          shuffle: true,
         });
       } catch (e) {
         console.error("Failed to shuffle play album:", e);