Fix LLM hallucinations by dynamically generating prompt examples from catalog

[ctate]

• Dynamically generate prompt examples from the user's actual catalog instead of hardcoding component names like Stack, Column, Pressable
• Add example field to ComponentDefinition and populate across all catalogs so prompt examples show realistic props instead of empty props: {}
• Fall back to Zod schema introspection for components without explicit examples
• Mention RFC 6902 in the output format section to leverage LLM training weights
• Generalize platform default rules to reference component categories instead of specific names

Fixes #88

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