Update react monorepo to v19 (major) (#26)

This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
|
[@types/react](https://redirect.github.com/DefinitelyTyped/DefinitelyTyped/tree/master/types/react)
([source](https://redirect.github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/react))
| [`^18.3.18` ->
`^19.0.0`](https://renovatebot.com/diffs/npm/@types%2freact/18.3.18/19.0.8)
|
[![age](https://developer.mend.io/api/mc/badges/age/npm/@types%2freact/19.0.8?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/npm/@types%2freact/19.0.8?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/npm/@types%2freact/18.3.18/19.0.8?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/@types%2freact/18.3.18/19.0.8?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
|
[@types/react-dom](https://redirect.github.com/DefinitelyTyped/DefinitelyTyped/tree/master/types/react-dom)
([source](https://redirect.github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/react-dom))
| [`^18.3.5` ->
`^19.0.0`](https://renovatebot.com/diffs/npm/@types%2freact-dom/18.3.5/19.0.3)
|
[![age](https://developer.mend.io/api/mc/badges/age/npm/@types%2freact-dom/19.0.3?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/npm/@types%2freact-dom/19.0.3?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/npm/@types%2freact-dom/18.3.5/19.0.3?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/@types%2freact-dom/18.3.5/19.0.3?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
| [react](https://react.dev/)
([source](https://redirect.github.com/facebook/react/tree/HEAD/packages/react))
| [`^18.3.1` ->
`^19.0.0`](https://renovatebot.com/diffs/npm/react/18.3.1/19.0.0) |
[![age](https://developer.mend.io/api/mc/badges/age/npm/react/19.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/npm/react/19.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/npm/react/18.3.1/19.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/react/18.3.1/19.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
| [react-dom](https://react.dev/)
([source](https://redirect.github.com/facebook/react/tree/HEAD/packages/react-dom))
| [`^18.3.1` ->
`^19.0.0`](https://renovatebot.com/diffs/npm/react-dom/18.3.1/19.0.0) |
[![age](https://developer.mend.io/api/mc/badges/age/npm/react-dom/19.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/npm/react-dom/19.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/npm/react-dom/18.3.1/19.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/react-dom/18.3.1/19.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

---

### Release Notes

<details>
<summary>facebook/react (react)</summary>

###
[`v19.0.0`](https://redirect.github.com/facebook/react/compare/v18.3.1...63cde684f5340b1ca73f6244501aac1c3d2c92a8)

[Compare
Source](https://redirect.github.com/facebook/react/compare/v18.3.1...v19.0.0)

</details>

<details>
<summary>facebook/react (react-dom)</summary>

###
[`v19.0.0`](https://redirect.github.com/facebook/react/compare/v18.3.1...63cde684f5340b1ca73f6244501aac1c3d2c92a8)

[Compare
Source](https://redirect.github.com/facebook/react/compare/v18.3.1...v19.0.0)

</details>

---

### Configuration

📅 **Schedule**: Branch creation - At any time (no schedule defined),
Automerge - At any time (no schedule defined).

🚦 **Automerge**: Disabled by config. Please merge this manually once you
are satisfied.

♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the
rebase/retry checkbox.

🔕 **Ignore**: Close this PR and you won't be reminded about these
updates again.

---

- [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check
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---

This PR was generated by [Mend Renovate](https://mend.io/renovate/).
View the [repository job
log](https://developer.mend.io/github/hironow/advena).

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---------

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Co-authored-by: hironow <[email protected]>

Author: renovate[bot]

frontend/web/components/toolbar.tsx

@@ -409,12 +409,12 @@ const PureToolbar = ({
   blockKind: 'text' | 'code';
 }) => {
   const toolbarRef = useRef<HTMLDivElement>(null);
-  const timeoutRef = useRef<ReturnType<typeof setTimeout>>();
+  const timeoutRef = useRef<ReturnType<typeof setTimeout> | null>(null);
 
   const [selectedTool, setSelectedTool] = useState<string | null>(null);
   const [isAnimating, setIsAnimating] = useState(false);
 
-  useOnClickOutside(toolbarRef, () => {
+  useOnClickOutside(toolbarRef as React.RefObject<HTMLElement>, () => {
     setIsToolbarVisible(false);
     setSelectedTool(null);
   });

frontend/web/components/use-scroll-to-bottom.ts

@@ -1,8 +1,8 @@
 import { useEffect, useRef, type RefObject } from 'react';
 
 export function useScrollToBottom<T extends HTMLElement>(): [
-  RefObject<T>,
-  RefObject<T>,
+  RefObject<T | null>,
+  RefObject<T | null>,
 ] {
   const containerRef = useRef<T>(null);
   const endRef = useRef<T>(null);

frontend/web/package.json

@@ -50,8 +50,8 @@
     "prosemirror-schema-list": "^1.5.0",
     "prosemirror-state": "^1.4.3",
     "prosemirror-view": "^1.37.2",
-    "react": "^18.3.1",
-    "react-dom": "^18.3.1",
+    "react": "^19.0.0",
+    "react-dom": "^19.0.0",
     "react-markdown": "^9.0.3",
     "react-resizable-panels": "^2.1.7",
     "remark-gfm": "^4.0.0",
@@ -72,8 +72,8 @@
     "@types/d3-scale": "^4.0.8",
     "@types/node": "^22.13.0",
     "@types/pdf-parse": "^1.1.4",
-    "@types/react": "^18.3.18",
-    "@types/react-dom": "^18.3.5",
+    "@types/react": "^19.0.0",
+    "@types/react-dom": "^19.0.0",
     "jsdom": "^26.0.0",
     "postcss": "^8.5.1",
     "tailwindcss": "^3.4.17",