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>

crates/yaak-git/index.ts

@@ -95,8 +95,8 @@ export const gitMutations = (dir: string, callbacks: GitCallbacks) => {
 
   const handleError = (err: unknown) => {
     showToast({
-      id: `${err}`,
-      message: `${err}`,
+      id: String(err),
+      message: String(err),
       color: "danger",
       timeout: 5000,
     });