refactor(templates): remove React.FC usage from CLI landing page components

[gonzoblasco]

Remove React.FC usage from CLI (#277)

Closes #277

Summary

Removes React.FC and FC type annotations from all landing page template components in the CLI's prod-assets directory. The website was already done in #275; this completes the CLI side.

Changes

Replaced FC<Props> / React.FC<Props> with plain function components and inline prop types across 9 components:

• Link.tsx — React.FC<LinkProps> → plain function
• headings.tsx — FC<ComponentProps<"h1-h4">> → plain functions (H1, H2, H3, H4)
• Container.tsx — FC<ContainerProps> → plain function
• Paragraph.tsx — FC<ComponentProps<"p">> → plain function
• InlineCode.tsx — FC<ComponentProps<"code">> → plain function
• Subtitle.tsx — FC<ComponentProps<"p">> → plain function
• Section.tsx — FC<ComponentProps<"section">> → plain function
• TechnologyGrid.tsx — FC<TechnologyGridProps> → plain function
• TechnologyGridItem.tsx — FC<TechnologyGridItemProps> → plain function

Why

React.FC is discouraged in modern React because it implicitly adds children to props (even when not needed) and provides no benefit over plain function components with explicit prop types.

Verification

• ✅ pnpm run build — clean
• ✅ pnpm run lint — no errors
• ✅ pnpm run unit — 9/9 tests pass
• ✅ No remaining FC or React.FC usage in prod-assets/

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