feat: initialize project with Vite + React + TypeScript + Tailwind CSS

- Set up Vite 7 + React 19 + TypeScript 5 + Tailwind CSS 4
- Configure path aliases (@/ -> src/)
- Create Layout with Header and Footer components
- Create HomePage with hero section and feature highlights
- Set up cursor rules for agent-driven development
- Create PLAN.md and LESSONS.md for progress tracking

Co-authored-by: Cursor <cursoragent@cursor.com>

.cursor/rules/project-overview.mdc

@@ -0,0 +1,30 @@
+---
+description: Project overview and conventions for the Diet Reference App
+alwaysApply: true
+---
+
+# Diet & Healthy Weight Reference App
+
+## Project
+Static SPA — справочник методик похудения и здорового веса. Vite 6 + React 19 + TypeScript 5 + Tailwind CSS 4 + React Router 7.
+
+## Key Conventions
+- All code in TypeScript strict mode — no `any`, no `as` casts without justification
+- Functional components only, prefer named exports
+- Custom hooks for reusable logic (prefix `use`)
+- Data lives in `src/data/` as typed TS modules
+- All user state (theme, bookmarks) via localStorage through custom hooks
+- Semantic HTML + ARIA attributes for accessibility
+- Russian language for UI content, English for code (variable names, comments)
+
+## File Structure
+- `src/components/` — reusable UI components (Button, Card, Badge, etc.)
+- `src/pages/` — route-level page components
+- `src/data/` — static content data (methods, categories)
+- `src/hooks/` — custom React hooks
+- `src/utils/` — pure utility functions
+- `src/types/` — shared TypeScript types and interfaces
+
+## Commit Style
+- Atomic commits per feature
+- Format: `feat: short description` / `fix:` / `refactor:` / `style:` / `docs:`