feat: Add Center alignment to ColumnAlignment for comfy-table compatibility

Co-authored-by: aider (openai/andrew/openrouter/deepseek/deepseek-chat-v3.1) <aider@aider.chat>

src/config.rs

@@ -21,6 +21,7 @@ pub enum ColumnAlignment {
     #[default]
     Left,
     Right,
+    Center,
 }
 
 impl<'de> serde::Deserialize<'de> for ColumnConfig {

src/modes/list.rs

@@ -161,6 +161,7 @@ pub fn mode_list(
             cell = match column.align {
                 crate::config::ColumnAlignment::Right => cell.set_alignment(CellAlignment::Right),
                 crate::config::ColumnAlignment::Left => cell.set_alignment(CellAlignment::Left),
+                crate::config::ColumnAlignment::Center => cell.set_alignment(CellAlignment::Center),
             };
             table_row.add_cell(cell);
         }