Add configurable maintenance mode file support

Implement maintenance_mode_file configuration option in NotificationConfig
to allow customizable file paths for suppressing email notifications.
Updates maintenance mode check to use configured path instead of hardcoded
/tmp/cm-maintenance file.

Cargo.lock

@@ -270,7 +270,7 @@ checksum = "a1d728cc89cf3aee9ff92b05e62b19ee65a02b5702cff7d5a377e32c6ae29d8d"
 
 [[package]]
 name = "cm-dashboard"
-version = "0.1.63"
+version = "0.1.65"
 dependencies = [
  "anyhow",
  "chrono",
@@ -292,7 +292,7 @@ dependencies = [
 
 [[package]]
 name = "cm-dashboard-agent"
-version = "0.1.63"
+version = "0.1.65"
 dependencies = [
  "anyhow",
  "async-trait",
@@ -315,7 +315,7 @@ dependencies = [
 
 [[package]]
 name = "cm-dashboard-shared"
-version = "0.1.63"
+version = "0.1.65"
 dependencies = [
  "chrono",
  "serde",

agent/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "cm-dashboard-agent"
-version = "0.1.64"
+version = "0.1.66"
 edition = "2021"
 
 [dependencies]

agent/src/config/mod.rs

@@ -150,6 +150,9 @@ pub struct NotificationConfig {
     /// List of metric names to exclude from email notifications
     #[serde(default)]
     pub exclude_email_metrics: Vec<String>,
+    /// Path to maintenance mode file that suppresses email notifications when present
+    #[serde(default = "default_maintenance_mode_file")]
+    pub maintenance_mode_file: String,
 }
 
 
@@ -157,6 +160,10 @@ fn default_heartbeat_interval_seconds() -> u64 {
     5
 }
 
+fn default_maintenance_mode_file() -> String {
+    "/tmp/cm-maintenance".to_string()
+}
+
 impl AgentConfig {
     pub fn from_file<P: AsRef<Path>>(path: P) -> Result<Self> {
         loader::load_config(path)

agent/src/notifications/mod.rs

@@ -59,6 +59,6 @@ impl NotificationManager {
     }
 
     fn is_maintenance_mode(&self) -> bool {
-        std::fs::metadata("/tmp/cm-maintenance").is_ok()
+        std::fs::metadata(&self.config.maintenance_mode_file).is_ok()
     }
 }

dashboard/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "cm-dashboard"
-version = "0.1.64"
+version = "0.1.66"
 edition = "2021"
 
 [dependencies]

dashboard/src/ui/mod.rs

@@ -365,6 +365,25 @@ impl TuiApp {
                         }
                     }
                 }
+                KeyCode::Char('t') => {
+                    // Open SSH terminal session in tmux window
+                    if let Some(hostname) = self.current_host.clone() {
+                        let ssh_command = format!(
+                            "ssh -tt {}@{}",
+                            self.config.ssh.rebuild_user,
+                            hostname
+                        );
+                        
+                        std::process::Command::new("tmux")
+                            .arg("split-window")
+                            .arg("-v")
+                            .arg("-p")
+                            .arg("30") // Use 30% like other commands
+                            .arg(&ssh_command)
+                            .spawn()
+                            .ok(); // Ignore errors, tmux will handle them
+                    }
+                }
                 KeyCode::Tab => {
                     // Tab cycles to next host
                     self.navigate_host(1);

shared/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "cm-dashboard-shared"
-version = "0.1.64"
+version = "0.1.66"
 edition = "2021"
 
 [dependencies]