MindMapper

Initial commit: MindMapper — AI mind-map generator on OpenRouter

Tauri 2 + React 19 desktop app:
- Frameless rounded-card window with custom titlebar (drag region, win
  controls) modeled after flov; full-height sidebar; dark/light themes.
- d3-hierarchy left-to-right tree with smooth collapse/expand animation,
  exit ghosts, pan (middle-mouse) / zoom (wheel-to-cursor), SVG/PNG
  export.
- Free-text model picker (provider/model slug); inline OpenRouter error
  parsing with red banner; per-map and all-time token counters
  persisted to localStorage.
- Mind maps saved as JSON in the OS app-data dir; loadable from the
  sidebar history.

Release tooling:
- scripts/build-installer.ps1 — local NSIS installer build.
- .github/workflows/release.yml — auto-build & attach the .exe to a
  GitHub Release on every `v*` tag push.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>