Fix JLPT underline color drift and AniList skipped-threshold sync

- Replace JLPT `text-decoration` underlines with `border-bottom` so Chromium selection/hover cannot repaint them to another annotation's color
- Lock JLPT underline color for combined annotation selectors (known, n+1, frequency) and character hover/selection states
- Trigger AniList post-watch check on every mpv time-position update to catch skipped completion thresholds
- Fall back to filename-parser season/episode when guessit omits them

src/core/services/anilist/anilist-updater.test.ts

@@ -22,6 +22,32 @@ test('guessAnilistMediaInfo uses guessit output when available', async () => {
   });
 });
 
+test('guessAnilistMediaInfo fills missing guessit episode from filename parser', async () => {
+  const result = await guessAnilistMediaInfo('/tmp/Guessit Title S01E09.mkv', null, {
+    runGuessit: async () => JSON.stringify({ title: 'Guessit Title' }),
+  });
+  assert.deepEqual(result, {
+    title: 'Guessit Title',
+    season: 1,
+    episode: 9,
+    source: 'guessit',
+  });
+});
+
+test('guessAnilistMediaInfo parses Little Witch Academia release filename', async () => {
+  const filename =
+    '/tmp/Little Witch Academia (2017) - S01E02 - 002 - Papiliodia [Bluray-1080p][10bit][h265][AC3 2.0][JA].mkv';
+  const result = await guessAnilistMediaInfo(filename, null, {
+    runGuessit: async () => JSON.stringify({ title: 'Little Witch Academia' }),
+  });
+  assert.deepEqual(result, {
+    title: 'Little Witch Academia',
+    season: 1,
+    episode: 2,
+    source: 'guessit',
+  });
+});
+
 test('guessAnilistMediaInfo falls back to parser when guessit fails', async () => {
   const result = await guessAnilistMediaInfo('/tmp/My Anime S01E03.mkv', null, {
     runGuessit: async () => {
@@ -54,7 +80,7 @@ test('guessAnilistMediaInfo uses basename for guessit input', async () => {
   ]);
   assert.deepEqual(result, {
     title: 'Rascal Does Not Dream of Bunny Girl Senpai',
-    season: null,
+    season: 1,
     episode: 1,
     source: 'guessit',
   });

src/core/services/anilist/anilist-updater.ts

@@ -236,12 +236,13 @@ export async function guessAnilistMediaInfo(
       const season = firstPositiveInteger(parsed.season);
       const year = firstYear(parsed.year);
       if (title) {
+        const fallback = parseMediaInfo(target);
         return {
           title: buildGuessitTitle(title, alternativeTitle),
           ...(alternativeTitle ? { alternativeTitle } : {}),
           ...(year ? { year } : {}),
-          season,
-          episode,
+          season: season ?? fallback.season,
+          episode: episode ?? fallback.episode,
           source: 'guessit',
         };
       }