fix: update test assertion for new key escaping format

The MappingKey::escape_project now replaces / with :: so
'issue:g/p:42' becomes 'issue:g::p:42'.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src-tauri/src/commands/mod.rs

@@ -873,7 +873,7 @@ mod tests {
         let result = bridge.incremental_sync(&mut map).unwrap();
 
         assert_eq!(result.created, 1);
-        assert!(map.mappings.contains_key("issue:g/p:42"));
+        assert!(map.mappings.contains_key("issue:g::p:42"));
     }
 
     // -- bv triage command tests --