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Expand §7.5 from three bullet points into a comprehensive frontend integration specification covering: Rust asset pipeline (status.rs, assets.rs, decoder.rs, api/mod.rs), HTML sub-tab/canvas/gallery markup, plugin loading registration, SSE decode event dispatch, full wefax.js plugin with live canvas line-painting and gallery thumbnails, image serving route, and decode history worker integration. Add Phase 3b to implementation roadmap for the frontend work items. https://claude.ai/code/session_01CbnUSjFGUzddvzwmddn5V6 Signed-off-by: Claude <noreply@anthropic.com>