fix(personas): add description + expectedUpdatedAt fields missing after main merge

After merging origin/main (cb3144999, #7126 public descriptions), two
struct initializers need updating for the new description field introduced
by that PR:

- concurrent_edit_tests.rs: add description: None to AgentDefinition,
  UpdatePersonaRequest (×2), and ManagedAgentRecord initializers
- personaTypes.ts: add expectedUpdatedAt to UpdatePersonaInput (moved
  from types.ts by #7126 but the field was not carried across)

Co-authored-by: Will Pfleger <pfleger.will@gmail.com>
Signed-off-by: Will Pfleger <pfleger.will@gmail.com>

desktop/src-tauri/src/commands/personas/update/concurrent_edit_tests.rs

@@ -36,6 +36,7 @@ fn persona(id: &str, display_name: &str, updated_at: &str) -> AgentDefinition {
         id: id.to_string(),
         display_name: display_name.to_string(),
         avatar_url: None,
+        description: None,
         system_prompt: "Do the work.".to_string(),
         runtime: None,
         model: None,
@@ -151,6 +152,7 @@ fn update_request(id: &str, display_name: &str, expected: Option<&str>) -> Updat
         id: id.to_string(),
         display_name: display_name.to_string(),
         avatar_url: None,
+        description: None,
         system_prompt: "Do the work.".to_string(),
         runtime: None,
         model: None,
@@ -459,6 +461,7 @@ async fn linked_instance_rename_completes_before_retain_error_propagates() {
         respond_to: Default::default(),
         respond_to_allowlist: vec![],
         display_name: Some("Alice".to_string()),
+        description: None,
         slug: None,
         runtime: None,
         name_pool: vec![],
@@ -485,6 +488,7 @@ async fn linked_instance_rename_completes_before_retain_error_propagates() {
             id: "p1".to_string(),
             display_name: "Alice Renamed".to_string(),
             avatar_url: None,
+            description: None,
             system_prompt: "Do the work.".to_string(),
             runtime: None,
             model: None,

desktop/src/shared/api/personaTypes.ts

@@ -95,4 +95,11 @@ export type UpdatePersonaInput = {
   namePool?: string[];
   envVars?: Record<string, string>;
   behavior?: PersonaBehaviorInput;
+  /**
+   * Seed-time definition revision for the backend's lock-held compare-and-swap.
+   * When present the backend rejects the write if the persisted `updated_at`
+   * has advanced since the editor was seeded — preventing a stale full-replacement
+   * from clobbering a concurrent writer. Omit (undefined) to skip the check.
+   */
+  expectedUpdatedAt?: string;
 };