feat: enhance strictness of Rust compiler settings and improve code quality by treating warnings as errors

Cargo.toml

@@ -4,6 +4,23 @@ version = "0.1.0"
 edition = "2021"
 authors = ["asepharyana <superaseph@gmail.com>"]
 
+# Treat all warnings as errors, set strict clippy levels
+[lints.rust]
+unused = "deny"
+dead_code = "deny"
+unreachable_code = "deny"
+unused_imports = "deny"
+unused_variables = "deny"
+unused_mut = "deny"
+unused_must_use = "deny"
+deprecated = "deny"
+trivial_casts = "deny"
+trivial_numeric_casts = "deny"
+
+[lints.clippy]
+all = { level = "warn", priority = -1 }
+pedantic = { level = "warn", priority = -2 }
+
 [dependencies]
 ratatui = "0.30.2"
 crossterm = "0.28"