feat(deeplink): add config merge command for preview

Expose config merging functionality to frontend for preview.
- Add merge_deeplink_config Tauri command
- Make parse_and_merge_config public for reuse
- Enable frontend to display complete config before import

src-tauri/src/commands/deeplink.rs

@@ -9,6 +9,16 @@ pub fn parse_deeplink(url: String) -> Result<DeepLinkImportRequest, String> {
     parse_deeplink_url(&url).map_err(|e| e.to_string())
 }
 
+/// Merge configuration from Base64/URL into a deep link request
+/// This is used by the frontend to show the complete configuration in the confirmation dialog
+#[tauri::command]
+pub fn merge_deeplink_config(
+    request: DeepLinkImportRequest,
+) -> Result<DeepLinkImportRequest, String> {
+    log::info!("Merging config for deep link request: {}", request.name);
+    crate::deeplink::parse_and_merge_config(&request).map_err(|e| e.to_string())
+}
+
 /// Import a provider from a deep link request (after user confirmation)
 #[tauri::command]
 pub fn import_from_deeplink(

src-tauri/src/deeplink.rs

@@ -398,7 +398,7 @@ requires_openai_auth = true
 /// Parse and merge configuration from Base64 encoded config or remote URL
 ///
 /// Priority: URL params > inline config > remote config
-fn parse_and_merge_config(
+pub fn parse_and_merge_config(
     request: &DeepLinkImportRequest,
 ) -> Result<DeepLinkImportRequest, AppError> {
     use base64::prelude::*;

src-tauri/src/lib.rs

@@ -706,6 +706,7 @@ pub fn run() {
             commands::sync_current_providers_live,
             // Deep link import
             commands::parse_deeplink,
+            commands::merge_deeplink_config,
             commands::import_from_deeplink,
             update_tray_menu,
             // Environment variable management