Fix perspective

Often a photo get a skewed perspective when taken with a handheld device. It usually looks like the top of the card has a smaller width than the bottom. This causes title to be slightly misplaced and rotated.

- [ ] Fix perspective so the extracted card will be a rectangle with parallel sides and 90 degrees corner.

Start by locating the card-extraction step responsible for correcting handheld photos, then inspect how skewed card edges affect the title position and rotation. Use a photo where the top and bottom widths differ to verify the result. Done means the extracted card is rectangular, has parallel sides, and has 90-degree corners.

Written by the indexing model from the issue text.