fix(anki): clip mined media on the sub-delay retimed timeline

mpv's sub-start/sub-end and parsed cues carry the subtitle file's own
timestamps; sub-delay (z/x, sub-step) only moves where mpv plays them.
Mining now shifts subtitle timings onto the video clock before media
generation, review, and MiscInfo timestamps.

changes/mining-respects-sub-delay.md

@@ -0,0 +1,4 @@
+type: fixed
+area: anki
+
+- Mined card audio, images, and timestamps now follow mpv's manual subtitle retiming (`sub-delay`, z/x), instead of clipping the subtitle file's original timing.