chore: adopt React 19 context/ref APIs and enforce via ESLint

.changeset/eslint-react19-context-ref.md

@@ -0,0 +1,10 @@
+---
+'@hyperdx/app': patch
+---
+
+Adopt React 19 context and ref APIs across the app and enforce them via ESLint.
+Render `<Context>` directly instead of `<Context.Provider>`, use the `use` hook
+instead of `useContext`, and pass `ref` as a regular prop instead of wrapping
+components in `forwardRef`. The corresponding `@eslint-react/no-context-provider`,
+`no-use-context`, and `no-forward-ref` rules are promoted to `error` and the
+app's `--max-warnings` ceiling is lowered. Behavior is unchanged.

packages/app/eslint.config.mjs

@@ -146,6 +146,12 @@ export default [
 
       'react-hook-form/no-use-watch': 'error',
       '@eslint-react/no-unstable-default-props': 'error',
+      // React 19 API adoption (all migrated): render <Context> instead of
+      // <Context.Provider>, use the `use` hook instead of `useContext`, and
+      // pass `ref` as a regular prop instead of wrapping in forwardRef.
+      '@eslint-react/no-context-provider': 'error',
+      '@eslint-react/no-use-context': 'error',
+      '@eslint-react/no-forward-ref': 'error',
       '@typescript-eslint/ban-ts-comment': 'error',
       // Empty no-op functions are common and intentional (test mocks, default
       // callback props like onClose/onChange). Flagging them adds noise without

packages/app/package.json

@@ -14,7 +14,7 @@
     "build:clickhouse": "NEXT_PUBLIC_THEME=clickstack NEXT_PUBLIC_IS_LOCAL_MODE=true NEXT_PUBLIC_CLICKHOUSE_BUILD=true next build --webpack && node scripts/prepare-clickhouse-build-export.js",
     "run:clickhouse": "test -d out && npx rimraf tmp && mkdir tmp && cp -r out tmp/clickstack && echo 'visit http://localhost:3000/clickstack to start' && npx serve tmp -l 3000 || echo 'run build:clickhouse first'",
     "start": "next start",
-    "lint": "npx eslint . --ext .ts,.tsx --max-warnings 601",
+    "lint": "npx eslint . --ext .ts,.tsx --max-warnings 564",
     "lint:fix": "npx eslint . --ext .ts,.tsx --fix",
     "lint:styles": "stylelint **/*/*.{css,scss}",
     "ci:lint": "yarn lint && yarn tsc --noEmit && yarn lint:styles --quiet",