Function strip_thiserror_placeholders 

pub fn strip_thiserror_placeholders(template: &str) -> String

Strip thiserror-style {name} placeholders from a Display template without leaving stray punctuation.

Examples:

• "OCR error: {message}" → "OCR error"
• "plugin error in '{plugin_name}'" → "plugin error"
• "timed out after {elapsed_ms}ms (limit: {limit_ms}ms)" → "timed out"
• "I/O error: {0}" → "I/O error"

Used by variant_display_message and binding error renderers (Dart, Go, …) so the literal placeholder string never reaches the runtime.