refactor: consolidate Radix imports in the GitHub agent example

[lilienblum]

Summary

• migrate the GitHub agent dashboard's component primitives to the unified radix-ui package
• update both existing UI component directories
• replace 27 individual Radix dependencies with one radix-ui dependency

Validation

• targeted tsc check for the migrated UI component sets
• dependency and import audits
• git diff --check

The example's full typecheck still reports unrelated existing chart, API, and remote-agent dependency errors.

Linear: ALIEN-480

[greptile-apps]

Greptile Summary

The PR migrates the GitHub agent dashboard’s two UI component sets from individual Radix packages to the consolidated radix-ui package.

• Rewrites primitive imports across 48 dashboard UI component files.
• Removes the individual Radix dependencies and adds the consolidated package.
• Replaces several other latest dependency declarations with compatible version ranges.

Confidence Score: 4/5

The PR is not yet safe to merge because fresh dashboard installations can still resolve an unvalidated radix-ui release.

The documented installation runs pnpm install, the committed lockfile has no package resolutions, and radix-ui remains declared with a caret range, so the dependency used by a fresh installation is not reproducible.

Files Needing Attention: examples/github-agent/packages/dashboard/package.json and examples/github-agent/packages/dashboard/pnpm-lock.yaml

Important Files Changed

Filename	Overview
examples/github-agent/packages/dashboard/package.json	Consolidates the Radix dependencies, but the compatible range and unresolved lockfile leave the previously reported reproducibility problem outstanding.
examples/github-agent/packages/dashboard/components/ui/form.tsx	Migrates the Label and Slot imports to the corresponding consolidated-package namespaces while preserving component usage.
examples/github-agent/packages/dashboard/components/ui/sidebar.tsx	Replaces direct primitive imports with consolidated Radix namespace imports without changing sidebar behavior.
examples/github-agent/packages/dashboard/ui/sidebar.tsx	Applies the same consolidated import migration to the second dashboard UI component directory.

_{Reviews (3): Last reviewed commit: "fix(example): use compatible dependency ..." | Re-trigger Greptile}