feat: functional gridfinity calculator app

memory-bank/progress.md

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+# Progress Tracking
+
+## Milestones
+- [ ] Initial Environment & Docs Setup
+- [ ] Core Calculation Engine
+- [ ] Web UI & Integration
+- [ ] Final Build & Polish
+
+## Todo List
+- [x] Create project structure
+- [x] Initialize Memory Bank documents
+- [ ] Create Blueprint documents (PRD, Architecture)
+- [ ] Project setup (Vite, TS, Tailwind, Vitest)
+- [ ] Implement `src/calculator.ts`
+- [ ] Write tests in `src/calculator.test.ts`
+- [ ] Implement `index.html` UI
+- [ ] Implement `src/main.ts` glue code
+- [ ] Verify build output