Prevent duplicate desktop model sessions and record calibration evidence

apps/desktop/src-tauri/Cargo.lock

@@ -3814,11 +3814,13 @@ dependencies = [
  "searchi-service",
  "serde",
  "serde_json",
+ "sha2 0.10.9",
  "tauri",
  "tauri-build",
  "tauri-plugin-dialog",
  "tauri-plugin-global-shortcut",
  "tauri-plugin-opener",
+ "tauri-plugin-single-instance",
  "tempfile",
  "uuid",
  "window-vibrancy",
@@ -4586,6 +4588,22 @@ dependencies = [
  "zbus",
 ]
 
+[[package]]
+name = "tauri-plugin-single-instance"
+version = "2.5.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3c142ed88deee222bd2d979269d35c73b6c1c0f6ebd5b79b4ff80066fcad6af1"
+dependencies = [
+ "serde",
+ "serde_json",
+ "tauri",
+ "thiserror 2.0.21",
+ "tokio",
+ "tracing",
+ "windows-sys 0.61.2",
+ "zbus",
+]
+
 [[package]]
 name = "tauri-runtime"
 version = "2.12.1"