feat(docs): enhance frontend engineering content and component styling
- Register frontend engineering demo components in theme index - Update AssetFingerprintDemo Vue imports and cleanup - Revise "finding great idea" content from numbered list to prose format - Expand web basics appendix with ECMAScript and TypeScript explanations - Improve SummaryCard component styling with enhanced gradients and spacing - Simplify BuildPipelineDemo and DependencyGraphDemo components for clarity
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