Reflect all changes since v0.2.3: Linux installation (deb/rpm/AppImage),
multiple profiles, transaction splits, budgets, encrypted export/import,
dark mode, interactive charts, user guide, and auto-updater. Fix GitHub
repo URL in badges.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Add CI/CD workflow that builds Windows installers (.msi/.exe) on tag push
via tauri-action. Rewrite README with installation guide, quick-start
instructions, and development setup — all in French.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>