Align lint fixes with main and resolve merge conflicts

- Convert biome-ignore to oxlint-disable-next-line across client app
- Fix no-base-to-string with type narrowing instead of suppressions
- Fix no-floating-promises with fireAndForget() in proxy app
- Fix restrict-template-expressions with String() wrapping
- Resolve leftover merge conflict markers in manager.rs
- Remove duplicate cmd_plugin_init_errors from lib.rs
- Add graphql as explicit dependency in yaak-client

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

apps/yaak-client/components/ExportDataDialog.tsx

@@ -55,7 +55,7 @@ function ExportDataDialogContent({
 
   const handleToggleAll = () => {
     setSelectedWorkspaces(
-      // biome-ignore lint/performance/noAccumulatingSpread: none
+      // oxlint-disable-next-line no-accumulating-spread
       allSelected ? {} : workspaces.reduce((acc, w) => ({ ...acc, [w.id]: true }), {}),
     );
   };