feat: implement layered settings system for HTTP requests and folders

Add support for settings overrides at folder and HTTP request levels. Introduces nullable settings columns to database tables and implements resolution logic to merge workspace, folder, and request-level settings with proper precedence.

crates-tauri/yaak-app/src/http_request.rs

@@ -178,11 +178,14 @@ async fn send_http_request_inner<R: Runtime>(
         window.db().resolve_environments(&workspace.id, folder_id, environment_id.as_deref())?;
     let request = render_http_request(&resolved, env_chain, &cb, &RenderOptions::throw()).await?;
 
+    // Resolve inherited settings for this request
+    let resolved_settings = window.db().resolve_settings_for_http_request(&resolved)?;
+
     // Build the sendable request using the new SendableHttpRequest type
     let options = SendableHttpRequestOptions {
-        follow_redirects: workspace.setting_follow_redirects,
-        timeout: if workspace.setting_request_timeout > 0 {
-            Some(Duration::from_millis(workspace.setting_request_timeout.unsigned_abs() as u64))
+        follow_redirects: resolved_settings.follow_redirects,
+        timeout: if resolved_settings.request_timeout > 0 {
+            Some(Duration::from_millis(resolved_settings.request_timeout.unsigned_abs() as u64))
         } else {
             None
         },
@@ -231,7 +234,7 @@ async fn send_http_request_inner<R: Runtime>(
     let client = connection_manager
         .get_client(&HttpConnectionOptions {
             id: plugin_context.id.clone(),
-            validate_certificates: workspace.setting_validate_certificates,
+            validate_certificates: resolved_settings.validate_certificates,
             proxy: proxy_setting,
             client_certificate,
         })

crates-tauri/yaak-app/src/lib.rs

@@ -233,7 +233,7 @@ async fn cmd_grpc_reflect<R: Runtime>(
             &uri,
             &proto_files.iter().map(|p| PathBuf::from_str(p).unwrap()).collect(),
             &metadata,
-            workspace.setting_validate_certificates,
+            workspace.setting_validate_certificates.unwrap_or(true),
             client_certificate,
             skip_cache.unwrap_or(false),
         )
@@ -327,7 +327,7 @@ async fn cmd_grpc_go<R: Runtime>(
             uri.as_str(),
             &proto_files.iter().map(|p| PathBuf::from_str(p).unwrap()).collect(),
             &metadata,
-            workspace.setting_validate_certificates,
+            workspace.setting_validate_certificates.unwrap_or(true),
             client_cert.clone(),
         )
         .await;

crates-tauri/yaak-app/src/ws_ext.rs

@@ -355,7 +355,7 @@ pub async fn cmd_ws_connect<R: Runtime>(
             url.as_str(),
             headers,
             receive_tx,
-            workspace.setting_validate_certificates,
+            workspace.setting_validate_certificates.unwrap_or(true),
             client_cert,
         )
         .await