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/Cargo.lock

@@ -900,14 +900,12 @@ dependencies = [
  "rusqlite",
  "serde",
  "serde_json",
- "serde_yaml",
  "tauri",
  "tauri-build",
  "tauri-plugin-dialog",
  "tauri-plugin-fs",
  "tauri-plugin-shell",
  "thiserror 2.0.18",
- "tokio",
  "uuid",
 ]
 
@@ -3281,19 +3279,6 @@ dependencies = [
  "syn 2.0.118",
 ]
 
-[[package]]
-name = "serde_yaml"
-version = "0.9.34+deprecated"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6a8b1a1a2ebf674015cc02edccce75287f1a0130d394307b36743c2f5d504b47"
-dependencies = [
- "indexmap 2.14.0",
- "itoa",
- "ryu",
- "serde",
- "unsafe-libyaml",
-]
-
 [[package]]
 name = "serialize-to-javascript"
 version = "0.1.2"
@@ -4070,25 +4055,11 @@ dependencies = [
  "bytes",
  "libc",
  "mio",
- "parking_lot",
  "pin-project-lite",
- "signal-hook-registry",
  "socket2",
- "tokio-macros",
  "windows-sys 0.61.2",
 ]
 
-[[package]]
-name = "tokio-macros"
-version = "2.7.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "385a6cb71ab9ab790c5fe8d67f1645e6c450a7ce006a33de03daa956cf70a496"
-dependencies = [
- "proc-macro2",
- "quote",
- "syn 2.0.118",
-]
-
 [[package]]
 name = "tokio-native-tls"
 version = "0.3.1"
@@ -4399,12 +4370,6 @@ version = "1.13.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "c6f5d3c3b1bf09027a88a6bc961fc00497d651009560b5463668dc81b0fa87a8"
 
-[[package]]
-name = "unsafe-libyaml"
-version = "0.2.11"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "673aac59facbab8a9007c7f6108d11f63b603f7cabff99fabf650fea5c32b861"
-
 [[package]]
 name = "untrusted"
 version = "0.9.0"

src-tauri/Cargo.toml

@@ -15,8 +15,6 @@ serde = { version = "1", features = ["derive"] }
 serde_json = "1"
 rusqlite = { version = "0.32", features = ["bundled"] }
 reqwest = { version = "0.12", features = ["json", "blocking"] }
-tokio = { version = "1", features = ["full"] }
-serde_yaml = "0.9"
 uuid = { version = "1", features = ["v4"] }
 chrono = { version = "0.4", features = ["serde"] }
 log = "0.4"

src-tauri/src/plugins/escpos.rs

@@ -8,6 +8,7 @@ pub const LF: &[u8] = b"\x0A";
 /// Cortar papel (parcial)
 pub const CUT: &[u8] = b"\x1D\x56\x01";
 /// Cortar papel (total)
+#[allow(dead_code)]
 pub const CUT_FULL: &[u8] = b"\x1D\x56\x00";
 /// Alimentar 3 linhas antes de cortar
 pub const FEED_CUT: &[u8] = b"\x1B\x64\x03";
@@ -17,6 +18,7 @@ pub const BOLD_OFF: &[u8] = b"\x1B\x45\x00";
 /// Alinhamento
 pub const ALIGN_LEFT: &[u8] = b"\x1B\x61\x00";
 pub const ALIGN_CENTER: &[u8] = b"\x1B\x61\x01";
+#[allow(dead_code)]
 pub const ALIGN_RIGHT: &[u8] = b"\x1B\x61\x02";
 /// Fonte normal / dupla
 pub const FONT_NORMAL: &[u8] = b"\x1B\x21\x00";
@@ -38,6 +40,7 @@ pub fn title(text: &str) -> Vec<u8> {
 }
 
 /// Monta linha normal (alinhada à esquerda)
+#[allow(dead_code)]
 pub fn line(text: &str) -> Vec<u8> {
     let mut out = Vec::new();
     out.extend_from_slice(ALIGN_LEFT);

src-tauri/src/plugins/printer.rs

@@ -5,6 +5,7 @@ use std::sync::Mutex;
 use thiserror::Error;
 
 #[derive(Error, Debug)]
+#[allow(dead_code)]
 pub enum PrinterError {
     #[error("Impressora não encontrada. Verifique se está conectada via USB e ligada.")]
     NotFound,

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();

src-tauri/src/plugins/supabase.rs

@@ -8,6 +8,7 @@ use tauri::State;
 use thiserror::Error;
 
 #[derive(Error, Debug)]
+#[allow(dead_code)]
 pub enum SupabaseError {
     #[error("HTTP error: {0}")]
     Http(#[from] reqwest::Error),