Added component scaffold skill

[brYch97]

Add scaffold-component-skill Copilot skill

Adds a new Copilot skill at .github/skills/scaffold-component-skill/SKILL.md that scaffolds new React component folders according to this repository's coding conventions.

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What the skill does

Invoke it with:

name=<ComponentName> overridableUi=<yes|no>

The skill creates a new component subfolder (kebab-case) inside the current folder and generates the canonical files:

overridableUi	Generated files
no	<ComponentName>.tsx, styles.ts, index.ts
yes	Above + components/components.tsx, components/index.ts

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Conventions encoded in the skill

• Folder names — kebab-case derived from the PascalCase component name
• Props interface — I<ComponentName>Props, defined in the main .tsx file
• Styles — mergeStyleSets from @fluentui/react, factory exported as get<ComponentName>Styles, called inside useMemo
• Overridable UI — I<ComponentName>Components interface + default mappings object; merged in component body as { ...DefaultComponents, ...props.components }
• Exports — every folder gets a barrel index.ts re-exporting the component
• No inline styles, no any, no fake business logic in generated scaffolds

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Why

Ensures every new component starts from the same structural baseline and enforces repository conventions (naming, styling, overridable UI pattern) without having to remember them or look them up.