Migrate textarea support to ratatui-textarea and align TUI dependencies

[Copilot]

This updates the TUI editor stack to the maintained ratatui-textarea crate and aligns the surrounding terminal dependencies with its compatibility requirements. The change keeps the existing textarea integration intact while moving the project onto the current ratatui/crossterm line.

• Dependency migration

  • Replaced tui-textarea with ratatui-textarea
  • Upgraded ratatui from 0.29 to 0.30
  • Upgraded crossterm from 0.28 to 0.29
  • Upgraded tui-input to a version compatible with crossterm 0.29

• Source updates

  • Swapped textarea imports from tui_textarea::TextArea to ratatui_textarea::TextArea
  • Kept the existing TextArea usage unchanged where the API remained compatible

• Lockfile refresh

  • Regenerated Cargo.lock for the new dependency graph
  • Pulled in the updated transitive crates required by the ratatui 0.30 stack

• Compatibility example

  use ratatui_textarea::TextArea;
  
  let input: TextArea<'_> = vec![
    "{".to_string(),
    r#"  "alg": "HS256","#.to_string(),
    r#"  "typ": "JWT""#.to_string(),
    "}".to_string(),
  ]
  .into();

[deepu105]

@copilot fix the ci failure

[Copilot]

@copilot fix the ci failure

Fixed in 61202e1. The failing CI job was Clippy; I updated the three blocking warnings and re-ran cargo fmt --all -- --check, cargo clippy --all --all-features --all-targets --workspace -- -D warnings, and cargo test, all of which now pass.