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/player/AudioPlayer.svelte

@@ -1,6 +1,6 @@
 <!-- TRACES: UR-004, UR-005, UR-028 | DR-009 -->
 <script lang="ts">
-  import { invoke } from "@tauri-apps/api/core";
+  import { commands } from "$lib/api/bindings";
   import { goto } from "$app/navigation";
   import type { MediaItem } from "$lib/api/types";
   import { auth } from "$lib/stores/auth";
@@ -74,28 +74,28 @@
   async function handleSeekEnd() {
     seeking = false;
     seekPending = true; // Keep showing target position until backend catches up
-    await invoke("player_seek", { position: seekValue });
+    await commands.playerSeek(seekValue);
   }
 
   // Control handlers for Controls component
   async function handlePlayPause() {
-    await invoke("player_toggle");
+    await commands.playerToggle();
   }
 
   async function handlePrevious() {
-    await invoke("player_previous");
+    await commands.playerPrevious();
   }
 
   async function handleNext() {
-    await invoke("player_next");
+    await commands.playerNext();
   }
 
   async function handleToggleShuffle() {
-    await invoke("player_toggle_shuffle");
+    await commands.playerToggleShuffle();
   }
 
   async function handleCycleRepeat() {
-    await invoke("player_cycle_repeat");
+    await commands.playerCycleRepeat();
   }
 
   // Prefer album ID for artwork (all tracks in an album share the same cover)
@@ -128,7 +128,7 @@
   async function handleQueueItemClick(index: number) {
     try {
       queue.skipTo(index);
-      await invoke("player_skip_to", { index });
+      await commands.playerSkipTo(index);
     } catch (e) {
       console.error("Failed to skip to queue item:", e);
     }