Adds AI-generated component descriptions to Components V2

[Mbeaulne]

Description

Adds AI-generated descriptions for components viewed in the Components V2 detail panel. When a component is selected, the panel now shows a dedicated description section with both the source-authored (prefilled) description and an AI-generated description produced by calling the configured LLM provider.

A new component-search-v2-ai-descriptions beta flag controls whether descriptions are generated automatically on component selection. When the flag is off, a manual "Generate AI description" button is shown instead. The flag is hidden in Beta Features settings unless the parent component-search-v2 flag is also enabled.

The ComponentDetail component gains a hideDescription prop so the detail panel can suppress the built-in description block when the caller renders its own description panel above it.

The source filter logic has been extracted from DashboardComponentsV2View into a dedicated DashboardComponentsV2SourceFilter module. Filter keys are now based on source kind rather than kind:id, so all registered libraries are grouped into a single "Registered libraries" toggle instead of one toggle per library. The registered libraries fingerprint now tracks the sorted set of known digests rather than just their count, so the index correctly invalidates when digest values change without a count change.

Related Issue and Pull requests

Type of Change

• Bug fix
• New feature
• Improvement
• Cleanup/Refactor
• Breaking change
• Documentation update

Checklist

• I have tested this does not break current pipelines / runs functionality
• I have tested the changes on staging

Screenshots (if applicable)

Test Instructions

1. Enable the component-search-v2 beta flag in Settings.
2. Open the Components V2 view and select any component.
3. Verify the detail panel shows a "Prefilled description" section and an "AI-generated description" section with a "Generate AI description" button.
4. Configure Agent settings with a valid LLM provider, then click "Generate AI description" and confirm a description is returned.
5. Enable the component-search-v2-ai-descriptions beta flag (visible only when component-search-v2 is enabled) and re-select a component. Confirm the description is generated automatically without clicking the button.
6. Confirm that after a generation error, the description is not retried automatically and a "Try again" button is shown.
7. Verify the source filter bar groups all registered libraries under a single "Registered libraries" toggle.

Additional Comments

The generateComponentAiDescription service function follows the same OpenAI-compatible chat completions pattern used by the existing rerank service. Internal prompt-builder and config-validation helpers have been renamed to avoid ambiguity now that both rerank and description generation share the same module.

[github-actions]

🎩 Preview

A preview build has been created at: 05-28-component_description/9815ec4

[Mbeaulne]

Warning

This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
Learn more

• Adds AI-generated component descriptions to Components V2 #2337 👈 (View in Graphite)
• Add AI rerank and detail actions to Components V2 #2323
• Add multi-source Components V2 search and filters #2322
• Add Components V2 route shell #2319
• Add component search support utilities #2318
• Extract shared component detail view #2317
• Add natural-language component rerank service #2321
• Add Agent Settings UI for AI search #2320
• Add BYOK component search settings hook #2316
• Add component search index service #2315
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