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/responseViewers/CsvViewer.tsx

@@ -43,7 +43,7 @@ export function CsvViewerInner({ text, className }: { text: string | null; class
         </TableHead>
         <TableBody>
           {parsed.data.map((row, i) => (
-            // biome-ignore lint/suspicious/noArrayIndexKey: none
+            // oxlint-disable-next-line react/no-array-index-key
             <TableRow key={i}>
               {parsed.meta.fields?.map((key) => (
                 <TableCell key={key}>{row[key] ?? ""}</TableCell>