domain: player/reporting ticks -> milliseconds (phase 4c)

Playback position now crosses the IPC boundary in milliseconds. Ticks
survive only inside Rust (DB storage, Jellyfin API) and at the genuine
remote-session boundary (session seek / transfer / RemoteControls).

Rust command signatures (ms in, converted to ticks internally):
- storage_update_playback_progress / _context: position_ms
- repository_report_playback_start / _progress / _stopped: position_ms
- PlaybackProgress.position_ticks -> position_ms (converted in the query)

Frontend:
- playbackReporting, playerEvents, VideoPlayer, Queue, player/[id] resume:
  seconds*1000 / durationMs/1000 instead of tick math.
- repository-client + syncService param names -> positionMs.
- Tests updated to ms fixtures/assertions.

Out of scope (legitimately ticks): NowPlayingItem, PlayState.positionTicks,
sessionSeek, playbackModeTransferToLocal, RemoteControls, SessionCard — the
remote Jellyfin session API.

Rust 456, frontend 644, check clean.

src/lib/components/player/Queue.svelte

@@ -36,9 +36,9 @@
   let dragDisabled = $state(true);
   const flipDurationMs = 200;
 
-  function formatDuration(ticks?: number | null): string {
-    if (!ticks) return "";
-    const seconds = Math.floor(ticks / 10000000);
+  function formatDuration(ms?: number | null): string {
+    if (!ms) return "";
+    const seconds = Math.floor(ms / 1000);
     const mins = Math.floor(seconds / 60);
     const secs = seconds % 60;
     return `${mins}:${secs.toString().padStart(2, "0")}`;