chore: clean Rust warnings and remove unused deps

- Remove serde_yaml and tokio from Cargo.toml (unused)
- Add #[allow(dead_code)] to utility code kept for future use
  (CUT_FULL, ALIGN_RIGHT, line(), PrinterError, SupabaseError,
   atualizar_sync, remover, Lock variant)
- Zero compiler warnings on release build

src-tauri/src/plugins/storage.rs

@@ -335,6 +335,7 @@ impl DbManager {
     }
 
     /// Atualiza sync_status de um registro.
+    #[allow(dead_code)]
     pub fn atualizar_sync(&self, uuid: &str, status: SyncStatus) -> Result<(), StorageError> {
         let conn = self.conn.lock().map_err(|_| StorageError::Lock)?;
         let now = Utc::now().format("%Y-%m-%dT%H:%M:%S%.3fZ").to_string();
@@ -346,6 +347,7 @@ impl DbManager {
     }
 
     /// Remove um registro (para debugging).
+    #[allow(dead_code)]
     pub fn remover(&self, uuid: &str) -> Result<bool, StorageError> {
         let conn = self.conn.lock().map_err(|_| StorageError::Lock)?;
         let n = conn.execute("DELETE FROM fechamentos WHERE uuid = ?1", params![uuid])?;
@@ -508,7 +510,7 @@ pub fn carregar_rascunho(
             // Simplifica para formato que o frontend espera
             let total_sangrias: f64 = e.tabelas.sangrias.iter().filter_map(|r| r.valor).sum();
             let total_despesas: f64 = e.tabelas.despesas.iter().filter_map(|r| r.valor).sum();
-            let total_receber: f64 = e.tabelas.areceber.iter().filter_map(|r| r.valor).sum();
+            let _total_receber: f64 = e.tabelas.areceber.iter().filter_map(|r| r.valor).sum();
             let despesa_rows: Vec<_> = e.tabelas.despesas.iter().filter_map(|r| {
                 r.descricao.as_ref().map(|d| serde_json::json!({"desc": d, "valor": r.valor}))
             }).collect();