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/preload.ts

@@ -5,15 +5,10 @@
  * TRACES: UR-004, UR-011 | DR-006, DR-015
  */
 
-import { invoke } from '@tauri-apps/api/core';
+import { commands } from '$lib/api/bindings';
+import type { CacheConfig } from '$lib/api/bindings';
 import { auth } from '$lib/stores/auth';
 
-interface PreloadResult {
-	queuedCount: number;
-	alreadyDownloaded: number;
-	skipped: number;
-}
-
 interface PreloadOptions {
 	/** Enable debug logging */
 	debug?: boolean;
@@ -39,10 +34,8 @@ export async function preloadUpcomingTracks(options: PreloadOptions = {}): Promi
 
 		if (debug) console.log('[Preload] Triggering preload for user:', userId);
 
-		const result = await invoke<PreloadResult>('player_preload_upcoming', {
-			userId,
-			downloadBasePath: '/downloads' // This parameter is currently unused in the backend
-		});
+		// downloadBasePath is currently unused in the backend
+		const result = await commands.playerPreloadUpcoming(userId, '/downloads');
 
 		if (debug) {
 			console.log('[Preload] Result:', {
@@ -66,27 +59,13 @@ export async function preloadUpcomingTracks(options: PreloadOptions = {}): Promi
 /**
  * Update smart cache configuration
  */
-export async function updateCacheConfig(config: {
-	queuePrecacheEnabled?: boolean;
-	queuePrecacheCount?: number;
-	albumAffinityEnabled?: boolean;
-	albumAffinityThreshold?: number;
-	storageLimit?: number;
-	wifiOnly?: boolean;
-}): Promise<void> {
-	await invoke('player_set_cache_config', { config });
+export async function updateCacheConfig(config: CacheConfig): Promise<void> {
+	await commands.playerSetCacheConfig(config);
 }
 
 /**
  * Get current cache configuration
  */
-export async function getCacheConfig(): Promise<{
-	queuePrecacheEnabled: boolean;
-	queuePrecacheCount: number;
-	albumAffinityEnabled: boolean;
-	albumAffinityThreshold: number;
-	storageLimit: number;
-	wifiOnly: boolean;
-}> {
-	return await invoke('player_get_cache_config');
+export async function getCacheConfig(): Promise<CacheConfig> {
+	return await commands.playerGetCacheConfig();
 }