feat: consolidate into single slidev-addon-marimo package

[lucharo]

Summary

• Consolidates slidev-addon-marimo-islands and slidev-addon-marimo-live into a single unified slidev-addon-marimo package
• Supports both Islands (Pyodide/WASM) and Live (WebSocket kernel) modes
• Reorganizes directory structure with clear islands/ and live/ separation

Changes

New Package Structure

slidev-addon-marimo/
├── components/
│   ├── islands/MarimoIsland.vue
│   └── live/MarimoLive.vue, MarimoOutput.vue, MarimoUI.vue
├── composables/
│   ├── islands/useCellRegistry.ts, useMarimoKernel.ts
│   └── live/useKernelState.ts, useMarimoKernel.ts
├── setup/
│   ├── islands/island-manager.ts, preparser.ts
│   ├── live/kernel-connection.ts, message-parser.ts, ui-sync.ts
│   ├── shared/constants.ts, kernel-message-patch.ts
│   ├── main.ts (unified entry with mode detection)
│   └── preparser.ts (handles both ```marimo and ```marimo-live)
└── index.ts (exports both modes)

Mode Detection

• Islands mode initializes automatically for ```marimo blocks
• Live mode only activates when explicitly configured via window.__MARIMO_LIVE_CONFIG__
• Both modes can coexist in the same presentation

Usage

---
addons:
  - slidev-addon-marimo
---

Test plan

• Islands mode tested in browser - slides render, Python executes, widgets work
• All 35 unit tests pass
• Live mode requires running marimo kernel for full testing

🤖 Generated with Claude Code