feat: upgrade to react 19

CLAUDE.md

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+# CLAUDE.md
+
+This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
+
+## Overview
+
+`@devtron-labs/devtron-fe-common-lib` is a React component and utility library for the Devtron platform. It is built with Vite and published to npm as an ES module.
+
+## Commands
+
+```bash
+# Type-check + lint (strict, max-warnings=0)
+npm run lint
+
+# Auto-fix lint issues
+npm run lint-fix
+
+# Build with source maps (development/local linking)
+npm run build
+
+# Watch mode rebuild with source maps
+npm run build-watch
+
+# Build without source maps (CI/CD, publishing)
+npm run build-lib
+
+# Vite dev server
+npm run dev
+
+# Generate icon/illustration components from SVGs
+npm run generate-icon
+npm run generate-illustration
+```
+
+There are no tests currently (`npm test` is a no-op).
+
+## Architecture
+
+### Entry & Exports
+
+`src/index.ts` re-exports everything from four top-level modules:
+
+- **`src/Common/`** — Legacy utilities, hooks, and components (BreadCrumb, SearchBar, Checkbox, etc.)
+- **`src/Shared/`** — Primary reusable code: 100+ UI components, hooks, providers, services, API utilities, types, helpers, constants, validations
+- **`src/Pages/`** — Full-page components (Applications, BulkEdit, GlobalConfigurations, ResourceBrowser)
+- **`src/Pages-Devtron-2.0/`** — New Devtron 2.0 features (ApplicationManagement, Navigation, SecurityCenter, etc.)
+
+### Component Structure Convention
+
+Components follow a consistent directory layout:
+
+```
+ComponentName/
+├── ComponentName.component.tsx   # Main component (forwardRef + React.memo typical)
+├── types.ts                      # TypeScript interfaces/types
+├── constants.ts                  # Component-level constants
+├── utils.ts                      # Helper functions
+├── component.scss                # Scoped SCSS styles
+└── index.ts                      # Barrel export
+```
+
+### Key Architectural Patterns
+
+**State management**: React Context API only — `MainContextProvider`, `ThemeProvider`, `UserEmailProvider`. No Redux/Zustand.
+
+**API layer**: TanStack Query (React Query v4) via `CoreAPI` class. API queuing handled via `APIQueuing`. Custom query hooks live in `Shared/API/reactQueryHooks.ts`.
+
+**Styling**: SCSS with BEM naming. CSS is injected into JS chunks via `vite-plugin-lib-inject-css`. No CSS modules.
+
+**SVG icons**: Imported as React components via `vite-plugin-svgr`. Two icon generations: `src/Assets/Icon/` and `src/Assets/IconV2/`. Do **not** use `IconBase` or `IllustrationBase` directly — use the `Icon` and `Illustration` wrapper components.
+
+**Toasts**: Do **not** import from `react-toastify` directly — use `ToastManager` from the library.
+
+**Forms**: Dynamic forms use `@rjsf` (React JSON Schema Form). Custom form hooks in `Shared/Hooks/`.
+
+**Router**: React Router v6 (`useBlocker` etc.). The `usePrompt` hook handles navigation blocking.
+
+### TypeScript & Path Aliases
+
+`tsconfig.json` configures path aliases used throughout the codebase:
+
+| Alias                | Maps to                   |
+| -------------------- | ------------------------- |
+| `@Icons/*`           | `src/Assets/Icon/*`       |
+| `@IconsV2/*`         | `src/Assets/IconV2/*`     |
+| `@Common/*`          | `src/Common/*`            |
+| `@Shared/*`          | `src/Shared/*`            |
+| `@Pages/*`           | `src/Pages/*`             |
+| `@PagesDevtron2.0/*` | `src/Pages-Devtron-2.0/*` |
+
+Strict mode is **off** in tsconfig. Target is ES2020, module is ESNext.
+
+### Build Output
+
+Vite splits the bundle into named chunks: `@vendor`, `@code-editor`, `@framer-motion`, `@moment`, `@react-select`, `@react-virtualized-sticky-tree`, `@common-rjsf`, `@src-assets-*`. Output is ES modules only, landing in `dist/`. Type declarations are generated via `vite-plugin-dts` at `dist/index.d.ts`.
+
+## Code Style
+
+- **Prettier**: No semicolons, single quotes, 120-char print width, 4-space tabs, trailing commas everywhere.
+- **ESLint**: Airbnb + TypeScript + Prettier. Import order enforced by `eslint-plugin-simple-import-sort`.
+- **Pre-commit**: `lint-staged` runs ESLint on staged `.{js,jsx,ts,tsx}` files via Husky.
+- JSX only in `.tsx` files (not `.jsx`).
+- `no-console` is a warning (not error).
+
+## CI/CD
+
+- **PRs**: Node version from `.nvmrc`, `npm ci`, `npm run lint`, `npm run build-lib`.
+- **Releases**: Triggered by GitHub release creation, runs `npm test` + `npm run build-lib` + `npm publish --access public` using `NPM_TOKEN` secret.