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/react-components/src/InputConsts/index.tsx

@@ -52,7 +52,7 @@ function InputConsts ({ className = '', defaultValue, label, onChange, withLabel
         const updated = { meta, method, section };
 
         setValue(updated);
-        onChange && onChange(updated);
+        onChange?.(updated);
       }
     },
     [api, onChange, value]

packages/react-components/src/InputConsts/options/key.tsx

@@ -21,7 +21,7 @@ export default function createOptions (api: ApiPromise, sectionName: string): Dr
     .filter((s) => !s.startsWith('$'))
     .sort()
     .map((value): DropdownOption => {
-      const method = (section[value] as ConstantCodec);
+      const method = section[value] as ConstantCodec;
 
       return {
         className: 'ui--DropdownLinked-Item',