Move to @pezkuwi/dev 0.86.4 (eslint 10 toolchain)

- dev ^0.86.4 at the root and in packages/apps; directives renamed by
  pezkuwi-dev-migrate-eslint10.
- eslint --fix with the 0.86.4 config; one fix broke syntax
  (typescript-eslint prefer-optional-chain turned
  `(isStarted && onStart) && onStart()` into `(isStarted && onStart?.();`
  in TxButton) and is corrected by hand.
- The remaining findings fixed rather than disabled: optional chains
  (each suggestion reviewed), `cause` on rethrown errors, `if` instead of
  `a && promise` in effects, parallel instead of sequential awaits in
  Promise.all, Error rejections, no `delete` on arrays (the storage query
  cache is a Map; an upload's file list no longer keeps a hole), no
  `[object Object]` stringification (TFunction's second argument is text
  or options), dead code removed (referenda's never-shown expand button,
  react-query's unused CoreDescriptor).

packages/page-coretime/src/Overview/filters/useSearchFilter.tsx

@@ -1,7 +1,7 @@
 // Copyright 2017-2026 @pezkuwi/app-coretime authors & contributors
 // SPDX-License-Identifier: Apache-2.0
 
-import React, { useCallback, useMemo, useState } from 'react';
+import { useCallback, useMemo, useState } from 'react';
 
 import { useRelayEndpoints } from '@pezkuwi/react-hooks/useParaEndpoints';
 
@@ -18,7 +18,7 @@ export function useSearchFilter ({ data, onFilter }: UseSearchFilterProps) {
       endpoints
         .filter((e) => e?.text && e.paraId)
         .map((e) => [
-          React.isValidElement(e.text) ? '' : String(e.text),
+          typeof e.text === 'string' ? e.text : '',
           e.paraId
         ])
     ),