feat: Add vibe-plotter FastHTML app for showcasing plot-agent

[andrewm4894]

Summary

Adds a new FastHTML web app called vibe-plotter that showcases plot-agent as an agentic data visualization tool. Users can select datasets, describe visualizations in natural language, and download generated plots.

Plot-Agent Enhancements

• Add load_from_url() method and from_url() classmethod for loading CSV data from URLs
• Add export methods: export_html(), export_png(), export_json(), export_code()
• Add httpx and kaleido dependencies

Vibe-Plotter App Features

• UCI ML Dataset Picker: 10 popular datasets via ucimlrepo API
• Custom URL Loading: Paste any CSV URL
• Chat Interface: Natural language visualization requests with HTMX
• Interactive Plotly Display: Real-time chart updates
• Export Options: Download as HTML, PNG, JSON, or Python code
• PostHog LLM Analytics: Full frontend + backend session linking
• Render Deployment: Ready-to-deploy configuration

Tech Stack

• FastHTML + Pico CSS (clean minimal UI)
• Plotly for interactive visualizations
• PostHog for analytics and LLM observability
• Render for deployment

Test Plan

• App starts successfully (python -m vibe_plotter.app)
• UCI dataset loading works (tested with Iris)
• Chat generates visualizations
• Plot displays with title, summary, and interactive chart
• All export formats work (HTML, PNG, JSON, code)
• Health check endpoint responds

[coderabbitai]

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