Ratatui 0.30 introduced breaking API changes that caused compilation failures and deprecation warnings.

Changes

• AnsiString width calculation: Use .as_str() to access underlying string content before calling .width()

  // Before
  strings.iter().map(|s| s.width() as u16).sum()
  
  // After
  strings.iter().map(|s| s.as_str().width() as u16).sum()

• Buffer indexing: Replace deprecated get_mut(x, y) with indexing syntax [(x, y)]

  // Before
  buf.get_mut(x, y).set_symbol("─")
  
  // After
  buf[(x, y)].set_symbol("─")

• Rect::area() return type: Changed from u16 to u32, updated comparisons with u32::from() conversions in example code

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