refactor: renderer: support mode 2026, manage cursor visibility and altscreen

Adds support for terminal mode 2026 sequences and reintroduces cursor
visibility and alt screen management in the Bubble Tea cursed renderer.

The latest changes from the UV renderer drop cursor visibility and alt
screen management. This commit reintroduces that logic into the Bubble
Tea cursed renderer to ensure proper behavior when switching between alt
screen modes and managing cursor visibility.

It also tries to optimize updates and remove redundant state changes.