GeezerVison

Adds examples/proa: three Plotly figures composed with reusable Rust components and exported to HTML.

• FrameworkBuilder handles managed metadata and response finalization through an in-process route request; no listening server is started.
• layout.rs owns the document; page.rs composes it; chart.rs defines Chart/ChartCard; plots.rs builds the figures.
• Run cd examples/proa && cargo run, then open output/multiple_plots.html.

Uses Proa's existing main revision for managed metadata; switch the temporary Git pin to crates.io after Proa 0.4 releases. Plotly.rs's core API and Askama templates are unchanged. A small Plotly.js initialization bridge remains pending RSJS interop support.

Validated with builds, Clippy, Rust 1.93, nightly Rustfmt, successful file export, and unchanged browser output.

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