Bug 2454886

## Describe the bug

Opening the Query Tool in pgAdmin 4 v9.14 immediately crashes with a blank white screen and React error #130 in the browser console:

```
Uncaught Error: Minified React error #130; visit https://react.dev/errors/130?args[]=undefined&args[]=
for the full message or use the non-minified dev environment for full errors and additional helpful warnings.
```

Error #130 means "Element type is invalid: expected a string or a class/function but got: undefined" — a React component resolves to `undefined` during render.

**Downgrading to pgAdmin 9.13 immediately fixes the issue.**

## To Reproduce

1. Install pgadmin4 9.14
2. Launch pgAdmin, connect to any PostgreSQL server
3. Open the Query Tool (right-click database → Query Tool, or toolbar icon)
4. **Result**: blank white screen, React error #130 in browser console

This is 100% reproducible. Tested with:
- Clean `~/.pgadmin/` (fresh database, no prior state)
- `LLM_ENABLED = False` in config_local.py — same crash
- Both via QtWebEngine (pgadmin4-qt) and via a regular browser (Firefox, Chrome) with the standalone Flask server
- Two independent machines with identical software

### Confirming the regression

5. `sudo dnf downgrade pgadmin4 pgadmin4-qt` (back to 9.13)
6. Open the Query Tool
7. **Result**: works correctly

## Secondary symptom

If the user had Query Tool tabs open when they last used 9.13, the `Browser/Layout` value in the `setting` table of `pgadmin4.db` references those tabs. After upgrading to 9.14, pgAdmin crashes **on startup** (not just when manually opening the Query Tool), because layout restoration attempts to render the Query Tool component. This makes the app appear completely broken with no obvious workaround. Deleting `Browser/Layout` from the `setting` table restores the main UI, but the Query Tool remains broken.

## Environment

- **pgAdmin version**: 9.14-1.fc45 (crashes) / 9.13-1.fc45 (works)
- **Package type**: RPM, Fedora 45 (Rawhide), x86_64
- **Runtime**: pgadmin4-qt (unofficial Qt runtime) and standalone Flask + browser (Firefox/Chrome)
- **Qt WebEngine**: 6.10.2 (irrelevant — crash reproduces in regular browsers too)
- **Reproduced on**: 2 independent machines with identical software

## Browser console stack trace (Chrome DevTools, server mode)

```
Uncaught Error: Minified React error #130
    at Wr (vendor_react.js?ver=91400:2:63273)
    at m  (vendor_react.js?ver=91400:2:74129)
    at    vendor_react.js?ver=91400:2:76288
    at ls (vendor_react.js?ver=91400:2:114688)
    at dc (vendor_react.js?ver=91400:2:152088)
    at uc (vendor_react.js?ver=91400:2:151936)
    at sc (vendor_react.js?ver=91400:2:151728)
    at Xo (vendor_react.js?ver=91400:2:147527)
    at Bc (vendor_react.js?ver=91400:2:163195)
    at Lc (vendor_react.js?ver=91400:2:161664)
```

`ver=91400` corresponds to pgAdmin 9.14.00 internal version.

## pgadmin4-qt console output

```
Starting pgAdmin 4. Please navigate to http://127.0.0.1:34977 in your browser.
2026-04-03 20:11:31,352: WARNING	werkzeug:	Werkzeug appears to be used in a production deployment.
 * Serving Flask app 'pgadmin'
 * Debug mode: off
js: Uncaught Error: Minified React error #130; visit https://react.dev/errors/130?args[]=undefined&args[]=
for the full message or use the non-minified dev environment for full errors and additional helpful warnings.
```