feat(stats): add alass sidecar retiming for sentence mining and fix timi

- Retime local English sidecars against the Japanese sidecar via alass before populating sentence card translation fields; cache retimed copies for the process lifetime
- Reject reversed or non-positive subtitle timings in immersion tracker and before media generation
- Fix word card mining so sentence audio goes to SentenceAudio (not ExpressionAudio) and English subtitle text is not written to SelectionText
- Consolidate 10 individual change fragments into stats-updates.md

src/main/runtime/mpv-client-event-bindings.test.ts

@@ -159,6 +159,30 @@ test('mpv subtitle timing handler runs AniList without timing tracker and passes
   assert.deepEqual(calls, ['immersion:line:899:901', 'post-watch:901']);
 });
 
+test('mpv subtitle timing handler skips invalid cue pairs until timing is complete', () => {
+  const calls: string[] = [];
+  const handler = createHandleMpvSubtitleTimingHandler({
+    recordImmersionSubtitleLine: (text, start, end) =>
+      calls.push(`immersion:${text}:${start}:${end}`),
+    hasSubtitleTimingTracker: () => true,
+    recordSubtitleTiming: (text, start, end) => calls.push(`timing:${text}:${start}:${end}`),
+    maybeRunAnilistPostWatchUpdate: async (options) => {
+      calls.push(`post-watch:${options?.watchedSeconds}`);
+    },
+    logError: () => calls.push('error'),
+  });
+
+  handler({ text: 'line', start: 953.991, end: 953.891 });
+  handler({ text: 'line', start: 953.991, end: 956.56 });
+
+  assert.deepEqual(calls, [
+    'post-watch:953.991',
+    'immersion:line:953.991:956.56',
+    'timing:line:953.991:956.56',
+    'post-watch:956.56',
+  ]);
+});
+
 test('mpv event bindings register all expected events', () => {
   const seenEvents: string[] = [];
   const bindHandlers = createBindMpvClientEventHandlers({

src/main/runtime/mpv-client-event-bindings.ts

@@ -72,7 +72,7 @@ export function createHandleMpvSubtitleTimingHandler(deps: {
       Number.isFinite(end) ? end : 0,
     );
     const options = watchedSeconds > 0 ? { watchedSeconds } : undefined;
-    if (text.trim()) {
+    if (text.trim() && Number.isFinite(start) && Number.isFinite(end) && end > start) {
       deps.recordImmersionSubtitleLine(text, start, end);
       if (deps.hasSubtitleTimingTracker()) {
         deps.recordSubtitleTiming(text, start, end);