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/components/library/VideoDownloadButton.svelte

@@ -1,7 +1,7 @@
 <script lang="ts">
   import { downloads } from "$lib/stores/downloads";
   import { auth } from "$lib/stores/auth";
-  import { invoke } from "@tauri-apps/api/core";
+  import { commands } from "$lib/api/bindings";
   import { QUALITY_PRESETS, type QualityPreset } from "$lib/api/quality-presets";
 
   interface Props {
@@ -66,11 +66,11 @@
       console.log("🎬 Starting video download for item:", itemId, "quality:", quality);
 
       // Get stream URL based on quality
-      const streamUrl = repo.getVideoDownloadUrl(itemId, quality);
+      const streamUrl = await repo.getVideoDownloadUrl(itemId, quality);
       console.log("   Stream URL obtained");
 
       // Get target directory
-      const targetDir = await invoke<string>("storage_get_path");
+      const targetDir = await commands.storageGetPath();
 
       // Create file path
       const safeName = (itemName || itemId).replace(/[/\\:*?"<>|]/g, "_");
@@ -107,11 +107,7 @@
       await downloads.pinItem(itemId);
 
       // Actually start the download
-      await invoke("start_download", {
-        downloadId,
-        streamUrl,
-        targetDir,
-      });
+      await commands.startDownload(downloadId, streamUrl, targetDir);
       console.log("   Download started");
     } catch (error) {
       console.error("Failed to start video download:", error);