Add editor component search loading skeleton

[Mbeaulne]

Description

Improves the component search UX with two key additions:

1. Search skeleton loading state — While a search query is debouncing or pending, a skeleton placeholder (5 rows with icon, title, and subtitle bones) replaces the previous spinner-in-header approach, giving users a clearer sense of incoming results.

2. AI rerank progress indicator — When AI reranking is active, an animated inline status message cycles through verbs ("Scanning", "Comparing", "Scoring", "Ranking") every 1.2 seconds to communicate that the AI is working, rather than showing a bare spinner.

Additionally, component icons in the sidebar now reflect their source kind with distinct colors:

• published → emerald
• registered → teal
• user / owned → orange
• default → blue

Components with a published_by field now display a "Published by {author}" subtitle beneath the component name.

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. Open the component search sidebar and type a query — confirm the skeleton appears immediately while the debounce is pending, then resolves into results.
2. Trigger AI reranking and confirm the animated progress label appears below the search box, cycling through verbs roughly every 1.2 seconds.
3. Inspect components from different sources (published, registered, user-owned) and confirm their icons render in the correct colors.
4. Confirm that components with a published_by value display the "Published by …" subtitle.

Additional Comments

The isSearching flag is derived by comparing the local (immediate) input value against the deferred committed query, so the skeleton is shown for the full debounce window without requiring any extra async state.

[github-actions]

🎩 Preview

A preview build has been created at: 06-29-add_editor_component_search_loading_skeleton_matt/8bed990

[Mbeaulne]

• Add per-query field boost directives to lexical search #2472
• Cache search index in query and show skeleton while typing #2471
• Add source filter bar to editor component search #2470
• Add source to component search v1 and v2 #2469
• Add editor component search loading skeleton #2468 👈 (View in Graphite)
• Reduce lexical search result limit and field weights #2467
• master

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[Mbeaulne]

Merge activity

• Jun 29, 5:50 PM UTC: A user started a stack merge that includes this pull request via Graphite.
• Jun 29, 5:58 PM UTC: Graphite rebased this pull request as part of a merge.
• Jun 29, 6:01 PM UTC: @Mbeaulne merged this pull request with Graphite.