fix build warnings

build.rs

@@ -2,6 +2,8 @@ use std::path::Path;
 use std::process::Command;
 
 fn main() {
+    let is_ci = std::env::var("CI").is_ok();
+
     // Verify that required directories exist at build time
     let required_dirs = vec!["static", "templates", "node_modules"];
 
@@ -18,10 +20,13 @@ fn main() {
         for dir in &missing_dirs {
             println!("cargo:warning=  - {}", dir);
         }
-
-        if missing_dirs.contains(&"node_modules") {
-            println!("cargo:warning=Run 'npm install' to install frontend dependencies");
     }
+
+    // node_modules is only needed for local dev (Docker/CI install deps separately)
+    if !is_ci && !Path::new("node_modules").exists() {
+        println!(
+            "cargo:warning=node_modules not found — run 'npm install' for frontend dependencies"
+        );
     }
 
     // Verify critical files
@@ -47,8 +52,10 @@ fn main() {
         }
     }
 
-    // Build mdBook documentation
+    // Build mdBook documentation (skip in CI — docs are built in Docker)
+    if !is_ci {
         build_documentation();
+    }
 
     // Tell cargo to rerun if these directories change
     println!("cargo:rerun-if-changed=static/");