docs: add JSDoc to exported viewer and app shell components

[baanish]

Motivation

• Improve local code discoverability by documenting the viewer flow, key props/callbacks, and notable renderer behavior for exported components used across the shell and renderers.
• Make intent explicit for read-only renderers, lazy-loaded language/code embeds, and fallback/error states so maintainers and integrators can reason about lifecycle and safety constraints.

Description

• Added concise JSDoc blocks above the exported components in the requested files to describe purpose, important props (for example onReady, selection handlers, onPreviewHash), and notable runtime behavior.
• Files updated: src/components/home/link-creator.tsx, src/components/viewer/artifact-selector.tsx, src/components/viewer/fragment-details-disclosure.tsx, src/components/renderers/markdown-renderer.tsx, src/components/renderers/code-renderer.tsx, src/components/renderers/diff-renderer.tsx, src/components/renderers/csv-renderer.tsx, src/components/renderers/json-renderer.tsx, src/components/theme-provider.tsx, src/components/theme-toggle.tsx, src/app/page.tsx, and src/app/layout.tsx.
• These are documentation-only additions and do not change runtime logic or behavior.

Testing

• Ran npm run lint and the lint pass completed successfully.

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Codex Task

[cloudflare-workers-and-pages]

Deploying agent-render with    Cloudflare Pages

Latest commit:	6376065
Status:	✅  Deploy successful!
Preview URL:	https://719fe40b.agent-render.pages.dev
Branch Preview URL:	https://codex-add-jsdoc-blocks-for-e.agent-render.pages.dev

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Code Review Summary

Status: No Issues Found | Recommendation: Merge

Overview

This PR adds JSDoc documentation blocks to 12 exported components across the agent-render application. The changes are purely documentation additions with no functional code modifications.

Files Reviewed (12 files)

• src/app/layout.tsx - JSDoc added to RootLayout
• src/app/page.tsx - JSDoc added to HomePage
• src/components/home/link-creator.tsx - JSDoc added to LinkCreator
• src/components/renderers/code-renderer.tsx - JSDoc added to CodeRenderer
• src/components/renderers/csv-renderer.tsx - JSDoc added to CsvRenderer
• src/components/renderers/diff-renderer.tsx - JSDoc added to DiffRenderer
• src/components/renderers/json-renderer.tsx - JSDoc added to JsonRenderer
• src/components/renderers/markdown-renderer.tsx - JSDoc added to MarkdownRenderer
• src/components/theme-provider.tsx - JSDoc added to ThemeProvider
• src/components/theme-toggle.tsx - JSDoc added to ThemeToggle
• src/components/viewer/artifact-selector.tsx - JSDoc added to ArtifactSelector
• src/components/viewer/fragment-details-disclosure.tsx - JSDoc added to FragmentDetailsDisclosure

Assessment

All JSDoc comments are accurate, well-written, and correctly describe:

• Component purpose and functionality
• Props and their usage
• Return value behavior
• Edge cases and fallback handling

The documentation follows consistent patterns across all components and aligns with the existing codebase style.