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/stores/connectivity.ts

@@ -6,8 +6,8 @@
 
 import { writable, derived } from "svelte/store";
 import { browser } from "$app/environment";
-import { invoke } from "@tauri-apps/api/core";
 import { listen } from "@tauri-apps/api/event";
+import { commands } from "$lib/api/bindings";
 
 export interface ConnectivityState {
   /** Browser's navigator.onLine status */
@@ -29,13 +29,6 @@ export interface ConnectivityEvents {
   onServerReconnected?: () => void;
 }
 
-interface RustConnectivityStatus {
-  isServerReachable: boolean;
-  lastChecked: string | null;
-  connectionError: string | null;
-  isChecking: boolean;
-}
-
 function createConnectivityStore() {
   const initialState: ConnectivityState = {
     isOnline: browser ? navigator.onLine : true,
@@ -115,10 +108,10 @@ function createConnectivityStore() {
    */
   async function checkServerReachable(): Promise<boolean> {
     try {
-      const isReachable = await invoke<boolean>("connectivity_check_server");
+      const isReachable = await commands.connectivityCheckServer();
 
       // Fetch updated status from Rust
-      const status = await invoke<RustConnectivityStatus>("connectivity_get_status");
+      const status = await commands.connectivityGetStatus();
       update((s) => ({
         ...s,
         isServerReachable: status.isServerReachable,
@@ -145,13 +138,13 @@ function createConnectivityStore() {
       console.log("[ConnectivityStore] Starting monitoring for:", url);
 
       // Set the server URL
-      await invoke("connectivity_set_server_url", { url });
+      await commands.connectivitySetServerUrl(url);
 
       // Start the Rust monitoring task (performs immediate check)
-      await invoke("connectivity_start_monitoring");
+      await commands.connectivityStartMonitoring();
 
       // Get the initial status immediately after starting
-      const status = await invoke<RustConnectivityStatus>("connectivity_get_status");
+      const status = await commands.connectivityGetStatus();
       update((s) => ({
         ...s,
         isServerReachable: status.isServerReachable,
@@ -179,7 +172,7 @@ function createConnectivityStore() {
     if (!isMonitoring) return;
 
     try {
-      await invoke("connectivity_stop_monitoring");
+      await commands.connectivityStopMonitoring();
       isMonitoring = false;
       eventHandlers = {};
       console.log("[ConnectivityStore] Stopped monitoring");
@@ -193,7 +186,7 @@ function createConnectivityStore() {
    */
   async function setServerUrl(url: string): Promise<void> {
     try {
-      await invoke("connectivity_set_server_url", { url });
+      await commands.connectivitySetServerUrl(url);
     } catch (error) {
       console.error("[ConnectivityStore] Failed to set server URL:", error);
     }
@@ -211,7 +204,7 @@ function createConnectivityStore() {
    */
   async function markReachable(): Promise<void> {
     try {
-      await invoke("connectivity_mark_reachable");
+      await commands.connectivityMarkReachable();
 
       // Update local state
       update((s) => ({
@@ -230,7 +223,7 @@ function createConnectivityStore() {
    */
   async function markUnreachable(error?: string): Promise<void> {
     try {
-      await invoke("connectivity_mark_unreachable", { error: error ?? null });
+      await commands.connectivityMarkUnreachable(error ?? null);
 
       // Update local state
       update((s) => ({