feat: move session history to a dedicated history screen (#175)

* feat: move session history to a dedicated history screen

Closes #159.

* fix(ci): fix ktlint style issues and unresolved NavigationController reference

app/src/main/java/com/m57/hermescontrol/NavigationController.kt

@@ -16,6 +16,7 @@ import androidx.navigation3.runtime.NavKey
  */
 object NavigationController {
     var backStack: NavBackStack<NavKey>? = null
+    var pendingSessionId: String? = null
 
     // Bottom-nav primary screens — dynamic, updated by Navigation.kt via
     // updatePrimaryScreens() when the user customises the bottom nav bar.