fix(deps): update dependency textual to v8

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
textual	==7.5.0 → ==8.0.0

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Release Notes

Textualize/textual (textual)

v8.0.0

Compare Source

Added

• Added mode argument to push_screen and push_screen_wait to enable pushing a screen to a non-active mode #​6362
• Added App.mode_change_signal and App.screen_change_signal #​6362
• Added Tabs.get_tab #​6362
• Added Catppuccin Frappe and Macchiato themes #​6335

Changed

• It is no longer a NOOP and warning to dismiss a non-active screen. The dismiss will still work, but the screen may not update if the current mode is not active. #​6362
• Added 50ms delay when switching screens to allow state to udpate and prevent janky flash of old content #​6362
• Breaking change: Changed Select.BLANK to Select.NULL to avoid clash with newer Widget.BLANK Classvar #​6374

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