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

changes/325-jlpt-combined-annotation-underlines.md

@@ -0,0 +1,4 @@
+type: fixed
+area: overlay
+
+- Overlay: Kept JLPT subtitle underlines on their JLPT color when lookup selection overlaps known-word or frequency annotation colors.

changes/326-anilist-time-position-post-watch.md

@@ -0,0 +1,4 @@
+type: fixed
+area: anilist
+
+- Anilist: Run post-watch progress checks on mpv time-position updates and fill missing `guessit` episode metadata from the filename parser so completed episodes are less likely to miss progress sync.