Clean up unused imports and fix build warnings

- Remove unused imports (Duration, HashMap, SharedError, DateTime, etc.)
- Fix unused variables by prefixing with underscore
- Remove redundant dashboard.toml config file
- Update theme imports to use only needed components
- Maintain all functionality while reducing warnings
- Add srv02 to predefined hosts configuration
- Remove unused broadcast_command methods

dashboard/src/communication/mod.rs

@@ -2,7 +2,6 @@ use anyhow::Result;
 use cm_dashboard_shared::{MetricMessage, MessageEnvelope, MessageType};
 use tracing::{info, error, debug, warn};
 use zmq::{Context, Socket, SocketType};
-use std::time::Duration;
 
 use crate::config::ZmqConfig;
 
@@ -80,11 +79,6 @@ impl ZmqConsumer {
         Ok(())
     }
     
-    /// Get list of newly connected hosts since last check
-    pub fn get_newly_connected_hosts(&self) -> Vec<String> {
-        // For now, return all connected hosts (could be enhanced with state tracking)
-        self.connected_hosts.iter().cloned().collect()
-    }
     
     /// Receive metrics from any connected agent (non-blocking)
     pub async fn receive_metrics(&mut self) -> Result<Option<MetricMessage>> {
@@ -128,32 +122,21 @@ impl ZmqConsumer {
         }
     }
     
-    /// Get list of connected hosts
-    pub fn get_connected_hosts(&self) -> Vec<String> {
-        self.connected_hosts.iter().cloned().collect()
-    }
-    
-    /// Check if connected to any hosts
-    pub fn has_connections(&self) -> bool {
-        !self.connected_hosts.is_empty()
-    }
 }
 
 /// ZMQ command sender for sending commands to agents
 pub struct ZmqCommandSender {
     context: Context,
-    config: ZmqConfig,
 }
 
 impl ZmqCommandSender {
-    pub fn new(config: &ZmqConfig) -> Result<Self> {
+    pub fn new(_config: &ZmqConfig) -> Result<Self> {
         let context = Context::new();
         
         info!("ZMQ command sender initialized");
         
         Ok(Self {
             context,
-            config: config.clone(),
         })
     }
     
@@ -181,24 +164,4 @@ impl ZmqCommandSender {
         // Socket will be automatically closed when dropped
         Ok(())
     }
-    
-    /// Send a command to all connected hosts
-    pub async fn broadcast_command(&self, hosts: &[String], command: AgentCommand) -> Result<Vec<String>> {
-        let mut failed_hosts = Vec::new();
-        
-        for hostname in hosts {
-            if let Err(e) = self.send_command(hostname, command.clone()).await {
-                error!("Failed to send command to {}: {}", hostname, e);
-                failed_hosts.push(hostname.clone());
-            }
-        }
-        
-        if failed_hosts.is_empty() {
-            info!("Successfully broadcast command {:?} to {} hosts", command, hosts.len());
-        } else {
-            warn!("Failed to send command to {} hosts: {:?}", failed_hosts.len(), failed_hosts);
-        }
-        
-        Ok(failed_hosts)
-    }
 }