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/playbackMode.ts

@@ -10,7 +10,7 @@
  */
 
 import { writable, get, derived } from "svelte/store";
-import { invoke } from "@tauri-apps/api/core";
+import { commands } from "$lib/api/bindings";
 import { sessions, selectedSession } from "./sessions";
 import { auth } from "./auth";
 import { ticksToSeconds } from "$lib/utils/playbackUnits";
@@ -47,7 +47,7 @@ function createPlaybackModeStore() {
    */
   async function refreshMode(): Promise<void> {
     try {
-      const rustMode = await invoke<RustPlaybackMode>("playback_mode_get_current");
+      const rustMode = (await commands.playbackModeGetCurrent()) as RustPlaybackMode;
 
       update((s) => ({
         ...s,
@@ -91,7 +91,7 @@ function createPlaybackModeStore() {
       // Rust handles everything - just wait for it to complete
       // It includes its own 5-second timeout for track loading
       console.log("[PlaybackMode] About to invoke playback_mode_transfer_to_remote with sessionId:", sessionId);
-      await invoke("playback_mode_transfer_to_remote", { sessionId });
+      await commands.playbackModeTransferToRemote(sessionId ?? "");
       console.log("[PlaybackMode] Invoke completed successfully");
 
       if (aborted) {
@@ -192,16 +192,13 @@ function createPlaybackModeStore() {
       // Use player_play_tracks - backend fetches all metadata from single ID
       const repositoryHandle = repository.getHandle();
 
-      await invoke("player_play_tracks", {
-        repositoryHandle,
-        request: {
-          trackIds: [itemId],
-          startIndex: 0,
-          shuffle: false,
-          context: {
-            type: "search",
-            searchQuery: "",
-          },
+      await commands.playerPlayTracks(repositoryHandle, {
+        trackIds: [itemId],
+        startIndex: 0,
+        shuffle: false,
+        context: {
+          type: "search",
+          searchQuery: "",
         },
       });
 
@@ -212,16 +209,13 @@ function createPlaybackModeStore() {
 
       // Seek to position if not at the very start
       if (positionSeconds > 0.5) {
-        await invoke("player_seek", { position: positionSeconds });
+        await commands.playerSeek(positionSeconds);
       }
 
       if (aborted) return;
 
       // Let Rust handle stopping remote playback
-      await invoke("playback_mode_transfer_to_local", {
-        currentItemId: itemId,
-        positionTicks,
-      });
+      await commands.playbackModeTransferToLocal(itemId, positionTicks);
 
       if (aborted) return;
 
@@ -328,7 +322,7 @@ function createPlaybackModeStore() {
 
     try {
       // Notify Rust backend to switch to idle mode
-      await invoke("playback_mode_set", { mode: { type: "idle" } });
+      await commands.playbackModeSet({ type: "idle" });
 
       // Update local state
       sessions.selectSession(null);