Reorganize dashboard UI with tabbed layout and improved status bars

Add tabbed navigation in right panel with "hosts | services" tabs to
better utilize vertical space. Hosts tab displays all available hosts
with blue selector bar (j/k navigation, Enter to switch). Services tab
shows services for currently selected host.

Status bar improvements:
- Move dashboard IP to top-right status bar (non-bold)
- Restructure bottom status bar with right-aligned build/agent versions
- Fix overflow crashes using saturating_sub for small terminal windows

Additional changes:
- Add HostsWidget with scroll handling and mouse click support
- Bold styling for currently active host
- Create render_content() methods to avoid nested blocks in tabs
- Display SMB share read/write mode in share listings

agent/src/collectors/systemd.rs

@@ -251,12 +251,11 @@ impl SystemdCollector {
                     if (service_name == "smbd" || service_name == "samba-smbd") && status_info.active_state == "active" {
                         // Add SMB shares as sub-services
                         let shares = self.get_smb_shares();
-                        for (share_name, share_path) in shares {
-                            let metrics = Vec::new();
+                        for (share_name, share_path, mode) in shares {
                             sub_services.push(SubServiceData {
-                                name: format!("{}: {}", share_name, share_path),
+                                name: format!("{}: {} {}", share_name, share_path, mode),
                                 service_status: Status::Info,
-                                metrics,
+                                metrics: Vec::new(),
                                 service_type: "smb_share".to_string(),
                             });
                         }
@@ -1133,13 +1132,14 @@ impl SystemdCollector {
     }
 
     /// Get SMB shares from smb.conf
-    /// Returns a list of (share_name, share_path) tuples
-    fn get_smb_shares(&self) -> Vec<(String, String)> {
+    /// Returns a list of (share_name, share_path, mode) tuples
+    fn get_smb_shares(&self) -> Vec<(String, String, String)> {
         match std::fs::read_to_string("/etc/samba/smb.conf") {
             Ok(config) => {
                 let mut shares = Vec::new();
                 let mut current_share: Option<String> = None;
                 let mut current_path: Option<String> = None;
+                let mut current_mode: String = "ro".to_string(); // Default to read-only
 
                 for line in config.lines() {
                     let line = line.trim();
@@ -1155,7 +1155,7 @@ impl SystemdCollector {
                         if let (Some(name), Some(path)) = (current_share.take(), current_path.take()) {
                             // Skip special sections
                             if name != "global" && name != "homes" && name != "printers" {
-                                shares.push((name, path));
+                                shares.push((name, path, current_mode.clone()));
                             }
                         }
 
@@ -1163,6 +1163,7 @@ impl SystemdCollector {
                         let share_name = line[1..line.len()-1].trim().to_string();
                         current_share = Some(share_name);
                         current_path = None;
+                        current_mode = "ro".to_string(); // Reset to default
                     }
                     // Look for path = /some/path
                     else if line.starts_with("path") && line.contains('=') {
@@ -1170,12 +1171,26 @@ impl SystemdCollector {
                             current_path = Some(path_value.trim().to_string());
                         }
                     }
+                    // Look for read only = yes/no
+                    else if line.to_lowercase().starts_with("read only") && line.contains('=') {
+                        if let Some(value) = line.split('=').nth(1) {
+                            let val = value.trim().to_lowercase();
+                            current_mode = if val == "no" || val == "false" { "rw" } else { "ro" }.to_string();
+                        }
+                    }
+                    // Look for writable = yes/no (opposite of read only)
+                    else if line.to_lowercase().starts_with("writable") && line.contains('=') {
+                        if let Some(value) = line.split('=').nth(1) {
+                            let val = value.trim().to_lowercase();
+                            current_mode = if val == "yes" || val == "true" { "rw" } else { "ro" }.to_string();
+                        }
+                    }
                 }
 
                 // Don't forget the last share
                 if let (Some(name), Some(path)) = (current_share, current_path) {
                     if name != "global" && name != "homes" && name != "printers" {
-                        shares.push((name, path));
+                        shares.push((name, path, current_mode));
                     }
                 }