FE-1707: Support custom icon packs in the design system

[kube]

Summary

Allow an application to supply an icon pack for a component tree. Icons omitted from the pack retain their design-system defaults.

9695-icon-pack-support.mp4

The component demo shows scoped replacements and fallback using the merged source. Checkbox states and both loading-spinner variants keep their design-system rendering.

Links

• Ticket FE-1707
• Ticket Editor UX (FE-1706)

Changes

• Export IconProvider and IconPack for scoped icon replacement
• Keep checkbox marks and loading indicators independent of icon packs
• Keep test files out of published component entry points and declarations
• Add a design-system patch changeset

Test coverage

IconProvider tests verify fallback, nested providers, checkbox state, loading indicators, sizing and accessible labels. Design-system, Petrinaut and website build, unit tests, types and lint passed on the Petricon integration tip.

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[cursor]

PR Summary

Medium Risk
New browser execution path for simulations/optimizations from chat with ownership locking and cancellation; moderate scope across core, React host, and AI UI, though heavily tested.

Overview
Adds AI-driven experiments end-to-end: petrinaut-core defines validated createExperiment request/result schemas and a runExperiment host contract (simulate or optimize, up to 100,000 runs). The React experiment host validates a frozen net snapshot, runs Monte Carlo or in-browser optimization with progress/cancellation, and locks experiment UI while a host-owned request is active.

The AI assistant executes createExperiment via ExperimentHostContext, shows progress cards with cancel/view-experiment, and keeps the panel mounted across Edit, Simulate, and Notebook. Net compilation diagnostics now note that scenario/metric checks happen at experiment creation.

Also ships an /ai-experiments website demo with a scripted transport, docs updates, and extensive tests.

Separately, ds-components adds IconProvider / IconPack for scoped icon overrides (defaults when omitted), excludes *.test.tsx from build entries, and exports the new API.

^{Reviewed by Cursor Bugbot for commit c457573. Bugbot is set up for automated code reviews on this repo. Configure here.}

[alex-e-leon]

Just the 2 comments, otherwise I'm ok to push the rest of the icon pack changes through for now

[alex-e-leon]

Go for it 👍

The base branch was changed.