feat: handle meta:<name> column type pattern

Co-authored-by: aider (openai/andrew/openrouter/qwen/qwen3-coder) <aider@aider.chat>

src/modes/common.rs

@@ -73,8 +73,14 @@ pub enum ColumnType {
 impl ColumnType {
     /// Returns a Result with error message if the string is not a valid ColumnType
     pub fn from_str(s: &str) -> anyhow::Result<Self> {
+        if s.starts_with("meta:") {
+            // Handle meta:<name> pattern - this is still a Meta column type
+            Ok(ColumnType::Meta)
+        } else {
+            // Handle regular column types
             Ok(Self::try_from(s)?)
         }
+    }
 }
 
 // impl TryFrom<&str> for ColumnType is already implemented by strum_macros