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/lib/services/favorites.ts

@@ -1,7 +1,7 @@
 // Favorites service - Handles toggling favorite status with optimistic updates
 // TRACES: UR-017 | DR-021
 
-import { invoke } from "@tauri-apps/api/core";
+import { commands } from "$lib/api/bindings";
 import { auth } from "$lib/stores/auth";
 
 /**
@@ -29,11 +29,7 @@ export async function toggleFavorite(
   const newIsFavorite = !currentIsFavorite;
 
   // 1. Update local database first (optimistic update)
-  await invoke("storage_toggle_favorite", {
-    userId,
-    itemId,
-    isFavorite: newIsFavorite,
-  });
+  await commands.storageToggleFavorite(userId, itemId, newIsFavorite);
 
   // 2. Sync to Jellyfin server
   try {
@@ -45,7 +41,7 @@ export async function toggleFavorite(
     }
 
     // 3. Mark as synced
-    await invoke("storage_mark_synced", { userId, itemId });
+    await commands.storageMarkSynced(userId, itemId);
   } catch (error) {
     console.error("Failed to sync favorite to server:", error);
     // Favorite is stored locally and will be synced later