Update dependency textual to v8.2.8

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
textual	==8.2.7 → ==8.2.8

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Release Notes

Textualize/textual (textual)

v8.2.8

Compare Source

Fixed

• Fixed parsing Kitty extended keys with multiple codepoints #​6592
• Fixed crash when clicking in the Screen's padding #​6598

Changed

• super+backspace is now an alias for ctrl+u in Input and TextArea #​6594
• alt+backspace (option+backspace on Mac) has the same effect as ctrl+backspace in Input and TextArea #​6593

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.23%. Comparing base (f79d71c) to head (ce9cb76).
⚠️ Report is 3 commits behind head on dev.

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