Update ratatui to 0.26.1

[albinekb]

Thanks for making this! It's fun to play with 👏 I wanted to use the latest ratatui, and there was some minor changes needed. LMK if there's anything i need to change.

[TheEmeraldBee]

One of the tests is failing. If you could look at that and either change the test or fix that, that would be great, and I can then accept the pull request. Thank you!

[albinekb]

The test failed because:

  left: Rect { x: 26, y: 125, width: 204, height: 3 }
 right: Rect { x: 26, y: 128, width: 204, height: 3 }

Breaking change in 0.25:
ratatui/ratatui#881

Should we keep using Legacy flex, so it behaves like before? (pushed commit)
Let me know if you'd like to use the new default Flex::Start and update the expected result in the test instead.

[TheEmeraldBee]

Lets update it.

[albinekb]

Great! Fixed ✅