Replace em dashes with hyphens across docs and comments

src/config.rs

@@ -13,7 +13,7 @@ pub struct Config {
 
     /// Per-printer CA certificate overrides, keyed by printer ID. Most
     /// Bambu printers chain to the bundled shared CA (`certs/bambu_ca2.pem`)
-    /// and don't need an entry here — but some models (P1P, at least) ship
+    /// and don't need an entry here - but some models (P1P, at least) ship
     /// their own certificate instead of one signed by that shared CA, with
     /// no single file covering all of them. Look up a printer's own entry
     /// (if any) when constructing it; there's no fleet-wide "the" override.
@@ -42,7 +42,7 @@ impl Config {
 }
 
 /// Parses `"printer_id=path,printer_id2=path2"` into a lookup map. Empty
-/// input (the common case — no overrides needed) yields an empty map.
+/// input (the common case - no overrides needed) yields an empty map.
 fn parse_cert_overrides(raw: &str) -> HashMap<String, PathBuf> {
     raw.split(',')
         .filter_map(|entry| entry.split_once('='))