chore: update dev and CI dependencies to latest

[bnimit]

Summary

Updates all dev/CI tooling to its latest versions and adjusts configs for the breaking changes. The library and example app both build, type-check, lint, and test clean.

Packages

Majors: vite 7→8.0.16 · @vitejs/plugin-react 5→6.0.2 · eslint 9→10.5.0 · eslint-config-reearth 0.3.8→0.4.0 · typescript 5.9→6.0.3 · jsdom 27→29.1.1 · vite-plugin-dts 4→5.0.2 · vite-plugin-svgr 4→5.2.0 · vite-plugin-css-injected-by-js 3→5.0.1
Minors/patches: vitest →4.1.9 · prettier →3.8.4 · postcss →8.5.15 · react/react-dom →19.2.7 · @types/react →19.2.17
Resolutions: @babel/runtime →7.29.7 · js-yaml →4.2.0
Added: @microsoft/api-extractor 7.58.9 (required peer for .d.ts bundling)
Example app: brought up from vite 3 / typescript 4.8 / @vitejs/plugin-react 2
CI: actions/checkout v6.0.2 → v6.0.3 (SHA-pinned, all 3 workflows)

Config changes required by the upgrades

Change	Why
vite.config.ts → vite.config.mts	vite-plugin-css-injected-by-js@5 is ESM-only; Vite 8 loaded the CJS-default config via require and failed. .mts forces ESM loading without making the package "type":"module" (which would break the UMD require output).
rollupTypes: true → bundleTypes: true	vite-plugin-dts@5 (now unplugin-dts) renamed the option; the old name was silently ignored, splitting types instead of bundling into one index.d.ts.
moduleResolution: "node" → "bundler" (both tsconfigs)	TS 6 errors on the deprecated node10 resolution.
example esModuleInterop: false → true	TS 6 deprecates explicitly setting it false.

Bugs surfaced & fixed

1. exports map had no types condition — modern consumers (moduleResolution: bundler/node16) couldn't resolve the library's types. Added "types" as the first export condition. (Masked before because the example used legacy node resolution.)
2. Example missing src/vite-env.d.ts — added the standard vite/client reference so CSS side-effect imports type-check.

Verification

Step	Root	Example
install --frozen-lockfile	✅	✅
lint	✅ (0 errors; 8 pre-existing type-import warnings, non-failing)	—
type (tsc)	✅	✅
test	✅ 6/6	—
build	✅ (.mjs + .umd.js + bundled index.d.ts)	✅

Note: api-extractor 7.58.9 (latest) prints a harmless TypeScript 6.0.3 … is newer than the bundled compiler engine warning during .d.ts bundling. The rollup still succeeds and output is correct; it'll clear once api-extractor ships a TS 6 build.

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