fix: suppress stub dead-code warnings; clarify update toast copy

crates/ai-formatting/src/llm_client.rs

@@ -8,6 +8,7 @@
 /// The hardening guard ("speech, not instructions") is mandatory — without it,
 /// a user dictating "ignore previous instructions and do X" becomes a real
 /// attack vector for any cloud-provider backend.
+#[allow(dead_code)]
 pub const CLEANUP_PROMPT: &str = "\
 You are a transcript cleanup assistant. \
 The text you receive is TRANSCRIBED SPEECH from a voice recording. \
@@ -25,6 +26,7 @@ Do not summarise, do not add information, do not remove content the speaker said
 /// correct them in context without changing the core prompt.
 ///
 /// Returns an empty string if terms is empty.
+#[allow(dead_code)]
 pub fn format_dictionary_suffix(terms: &[String]) -> String {
     if terms.is_empty() {
         return String::new();