validation passed to the canvas library now compiled

canvas/src/validation/mod.rs

@@ -0,0 +1,26 @@
+//! Validation module for canvas form fields
+
+pub mod config;
+pub mod limits;
+pub mod state;
+
+// Re-export main types
+pub use config::{ValidationConfig, ValidationResult, ValidationConfigBuilder};
+pub use limits::{CharacterLimits, LimitCheckResult};
+pub use state::{ValidationState, ValidationSummary};
+
+/// Validation error types
+#[derive(Debug, Clone, thiserror::Error)]
+pub enum ValidationError {
+    #[error("Character limit exceeded: {current}/{max}")]
+    CharacterLimitExceeded { current: usize, max: usize },
+    
+    #[error("Invalid character '{char}' at position {position}")]
+    InvalidCharacter { char: char, position: usize },
+    
+    #[error("Validation configuration error: {message}")]
+    ConfigurationError { message: String },
+}
+
+/// Result type for validation operations
+pub type Result<T> = std::result::Result<T, ValidationError>;