Add Cursor support to setup import (#33426)

## What changed

- Detect and import supported Cursor settings, sandbox permissions, MCP servers,
  project instructions, hooks, agents, commands, plugins, and recent chat
  sessions.
- Update the `/import` flow to check Claude Code and Cursor, prompting for a
  source when both have importable data.
- Add `migrationSource` to the app-server detect and import requests so each
  operation uses the selected adapter, while retaining `source` for import
  attribution and backwards compatibility.

## Testing

- Add coverage for Cursor config conversion, hooks, plugins, session discovery
  and conversion, app-server imports, and TUI source selection.

GitOrigin-RevId: a65a1511b6c1c2f9e3e0cfe4f816bb435807282e

codex-rs/app-server-protocol/src/protocol/v2/config.rs

@@ -684,10 +684,13 @@ pub struct ExternalAgentConfigDetectParams {
     /// Zero or more working directories to include for repo-scoped detection.
     #[ts(optional = nullable)]
     pub cwds: Option<Vec<PathBuf>>,
-    /// Optional import-source selector. Missing or unrecognized values use the default source for
-    /// backwards compatibility.
+    /// Deprecated field retained for compatibility. This field is ignored; use `migrationSource`
+    /// to select the migration source.
     #[ts(optional = nullable)]
     pub source: Option<String>,
+    /// Optional migration-source selector. Missing or unrecognized values use the default source.
+    #[ts(optional = nullable)]
+    pub migration_source: Option<String>,
 }
 
 #[derive(Serialize, Deserialize, Debug, Clone, PartialEq, Eq, JsonSchema, TS)]
@@ -695,11 +698,13 @@ pub struct ExternalAgentConfigDetectParams {
 #[ts(export_to = "v2/")]
 pub struct ExternalAgentConfigImportParams {
     pub migration_items: Vec<ExternalAgentConfigMigrationItem>,
-    /// Import-source selector used to produce the migration items. Pass the same value to detection
-    /// and import; missing or unrecognized values use the default source for backwards
-    /// compatibility.
+    /// Optional identifier for the product that initiated the import.
     #[ts(optional = nullable)]
     pub source: Option<String>,
+    /// Migration-source selector used to produce the migration items. Pass the same value to
+    /// detection and import; missing or unrecognized values use the default source.
+    #[ts(optional = nullable)]
+    pub migration_source: Option<String>,
 }
 
 #[derive(Serialize, Deserialize, Debug, Clone, PartialEq, Eq, JsonSchema, TS)]

codex-rs/app-server-protocol/src/protocol/v2/tests.rs

@@ -435,6 +435,7 @@ fn external_agent_config_import_params_accept_legacy_plugin_details() {
                 }),
             }],
             source: None,
+            migration_source: None,
         }
     );
 }