fix: resolve all remaining compilation errors

- Downgrade google_fonts from 6.1.0 to 5.1.0 for Flutter 3.16 compatibility
- Fix compute_centrality import path in CLI
- Fix error type conversion in serve command

Author: Anandb71

crates/arbor-cli/src/commands.rs

@@ -1,6 +1,6 @@
 //! CLI command implementations.
 
-use arbor_graph::ranking::compute_centrality;
+use arbor_graph::compute_centrality;
 use arbor_server::{ArborServer, ServerConfig};
 use arbor_watcher::index_directory;
 use colored::Colorize;
@@ -154,7 +154,7 @@ pub async fn serve(port: u16, path: &Path) -> Result<()> {
     println!("{} Listening on ws://127.0.0.1:{}", "✓".green(), port);
     println!("  Press {} to stop", "Ctrl+C".cyan());
 
-    server.run().await?;
+    server.run().await.map_err(|e| e.to_string())?;
 
     Ok(())
 }

visualizer/pubspec.yaml

@@ -11,7 +11,7 @@ dependencies:
     sdk: flutter
   flutter_riverpod: ^2.4.0
   web_socket_channel: ^2.4.0
-  google_fonts: ^6.1.0
+  google_fonts: ^5.1.0
   vector_math: ^2.1.4
 
 dev_dependencies: