Bump textual from 0.76.0 to 0.78.0 (#1038)

Bumps [textual](https://github.com/Textualize/textual) from 0.76.0 to 0.78.0.
- [Release notes](https://github.com/Textualize/textual/releases)
- [Changelog](https://github.com/Textualize/textual/blob/main/CHANGELOG.md)
- [Commits](Textualize/textual@v0.76.0...v0.78.0)

---
updated-dependencies:
- dependency-name: textual
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

pyproject.toml

@@ -83,7 +83,7 @@ tenacity = "^9.0.0"
 swifter = "^1.4.0"
 pydantic = "^2"
 rich = "^13.6.0"
-textual = "^0.76.0"
+textual = "^0.78.0"
 devtools = "^0.12.2"
 
 typing-extensions = "^4.12.2"