Add solver toolbar context menu for renderer/debug/animation

[seveibar]

Motivation

• Provide a compact context menu to the left of the breadcrumbs exposing renderer, debug and animation controls.
• Allow switching between the vector viewer and a Canvas-based viewer for the interactive graphics.
• Expose an action to download the current visualization and make animation speed selectable.
• Keep animation behavior consistent when the animation speed changes.

Description

• Add lib/react/SolverContextMenu.tsx which implements the Renderer, Debug and Animation dropdowns and local click-outside handling.
• Wire the new SolverContextMenu into GenericSolverToolbar and add new toolbar props: renderer, onRendererChange, onAnimationSpeedChange, and onDownloadVisualization.
• Update GenericSolverDebugger to track renderer and currentAnimationSpeed, import InteractiveGraphicsCanvas from graphics-debug/react, switch rendering between InteractiveGraphics and InteractiveGraphicsCanvas, and implement the visualization download blob logic.
• Refactor animation start/cleanup logic in the toolbar so re-starting/clearing respects animationSpeed changes.

Testing

• Ran typecheck with bunx tsc --noEmit and it completed successfully.
• Ran formatting with bun run format which formatted files successfully.
• Started the local Cosmos dev server with bun run start and exercised the UI, and captured a screenshot of the toolbar (playwright run) to validate placement and menus.
• No unit tests were added or modified in this change.

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Codex Task

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Project	Deployment	Review	Updated (UTC)
solver-utils	Ready	Preview, Comment	Jan 3, 2026 6:59pm