Shift the season marker towards the 1st column of the season, and add a subtle divider between seasons.
Tapping or clicking an episode block in the heatmap should open a quick action menu with three options-
See Details
Add to Watchlist/List
Ignore Episode
This will makes heatmap navigation interactive rather than just visual, streamlining how users plan rewatches or skip episodes.

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In Review
Ideas
3 days ago

mischievous_duck
Get notified by email when there are changes.
In Review
Ideas
3 days ago

mischievous_duck
Get notified by email when there are changes.