docs: update Copilot instructions and add changelog badge to README

Author: ArchILLtect

.github/copilot-instructions.md

@@ -4,7 +4,7 @@ Project: Vite + React 19 + TypeScript (strict), using SWC React plugin. Auth sta
 
 Big picture
 
--   SPA bootstrapped by Vite. Entry `src/main.tsx` mounts `src/App.tsx` into `#root` in `index.html`.
+-   SPA bootstrapped by Vite. Entry `src/main.tsx` mounts `src/App.tsx` into `root` in `index.html`.
 -   Build is type-first: `npm run build` executes `tsc -b` before `vite build`. CI fails on any TS errors.
 -   Flat ESLint config with React Hooks and React Refresh rules; focus on `.ts/.tsx` files; `dist/` ignored.
 -   ESM-only repository (`"type": "module"`, TS `moduleResolution: bundler`, `verbatimModuleSyntax: true`). Prefer `import type` for types.

README.md

@@ -1,5 +1,6 @@
 [![Frontend CI](https://github.com/sameboat-platform/frontend/actions/workflows/frontend-ci.yml/badge.svg)](https://github.com/sameboat-platform/frontend/actions/workflows/frontend-ci.yml)
 [![Release](https://img.shields.io/github/v/tag/sameboat-platform/frontend?label=release&sort=semver)](https://github.com/sameboat-platform/frontend/releases)
+[![Changelog 0.3.0](https://img.shields.io/badge/changelog-0.3.0-blue)](CHANGELOG.md#030---2025-10-29)
 [![License](https://img.shields.io/github/license/sameboat-platform/frontend.svg)](LICENSE)
 [![Dependencies](https://img.shields.io/github/actions/workflow/status/sameboat-platform/frontend/frontend-ci.yml?label=build)](https://github.com/sameboat-platform/frontend/actions)
 [![Coverage](./.github/badges/coverage.svg)](https://github.com/sameboat-platform/frontend/actions/workflows/coverage-badge.yml)