# Implementation Plan: Integrate SvelteKit

**Branch**: `004-integrate-svelte-kit` | **Date**: 2025-12-20 | **Spec**: [specs/004-integrate-svelte-kit/spec.md](specs/004-integrate-svelte-kit/spec.md)
**Input**: Feature specification from `/specs/004-integrate-svelte-kit/spec.md`

## Summary

Integrate SvelteKit as the primary frontend framework to provide seamless navigation, improved data loading, and a unified layout. The application will be configured as a Static Single Page Application (SPA) to be served by the existing Python backend, preserving all existing functionality while leveraging modern framework features like file-based routing and shared layouts.

## Technical Context

**Language/Version**: Python 3.9+, Node.js 18+  
**Primary Dependencies**: SvelteKit, FastAPI, Tailwind CSS (inferred from existing frontend)  
**Storage**: N/A (Frontend integration)  
**Testing**: pytest (Backend), Vitest/Playwright (Frontend - SvelteKit defaults)  
**Target Platform**: Linux server (SPA served by backend)
**Project Type**: Web application (frontend + backend)  
**Performance Goals**: Page transition time < 200ms (SC-001)  
**Constraints**: Must be deployable as a Static SPA (FR-003), no Node.js server in production (Assumptions)  
**Scale/Scope**: Migration of existing Dashboard and Settings pages

## Constitution Check

*GATE: Must pass before Phase 0 research. Re-check after Phase 1 design.*

- **Principle Compliance**: The project constitution is currently in a template state. No specific violations identified.
- **Architecture Alignment**: The move to SvelteKit aligns with the goal of using modern frontend patterns while maintaining the "SPA served by backend" constraint.

## Project Structure

### Documentation (this feature)

```text
specs/004-integrate-svelte-kit/
├── plan.md              # This file (/speckit.plan command output)
├── research.md          # Phase 0 output (/speckit.plan command)
├── data-model.md        # Phase 1 output (/speckit.plan command)
├── quickstart.md        # Phase 1 output (/speckit.plan command)
├── contracts/           # Phase 1 output (/speckit.plan command)
└── tasks.md             # Phase 2 output (/speckit.tasks command - NOT created by /speckit.plan)
```

### Source Code (repository root)

```text
backend/
├── src/
│   ├── models/
│   ├── services/
│   └── api/
└── tests/

frontend/
├── src/
│   ├── lib/
│   ├── routes/          # SvelteKit file-based routing
│   └── app.html
├── static/
└── tests/
```

**Structure Decision**: Option 2: Web application. The project already has `backend/` and `frontend/` directories. SvelteKit will be integrated into the `frontend/` directory, replacing the current Svelte setup.

## Complexity Tracking

> **Fill ONLY if Constitution Check has violations that must be justified**

| Violation | Why Needed | Simpler Alternative Rejected Because |
|-----------|------------|-------------------------------------|
| None | N/A | N/A |