refactor: remove redundant edge case check in truncate_description

Remove the unnecessary if-check that was doing nothing.
char_indices().next() always returns index 0 for the first character,
so this code was just reassigning truncate_at = 0 without any effect.

All tests pass without this code, confirming it was redundant.

Author: mzkmnk

crates/chat-cli/src/cli/chat/cli/prompts.rs

@@ -257,12 +257,6 @@ fn truncate_description(text: &str, max_length: usize) -> String {
             truncate_at = idx;
         }
 
-        // If we found a valid boundary, use it; otherwise use the last character start
-        if truncate_at == 0 && !text.is_empty() {
-            // Edge case: even the first character is too long
-            truncate_at = text.char_indices().next().map(|(i, _)| i).unwrap_or(0);
-        }
-        
         let truncated = &text[..truncate_at];
         format!("{}...", truncated.trim_end())
     }