fix: trim filenames when syncing React samples from npm @W-21361802@

[k-j-kim]

References: Contributing guide · Skill authoring guide · Agent Skills spec

What changed

• Sanitize directory/file names (trim) during copyRecursive in both
  sync-react-b2e-sample.js and sync-react-b2x-sample.js so source
  paths with trailing spaces (e.g. from npm packages) are written
  without trailing spaces under samples/.
• Fixes synced sample file rename: lds-guide-graphql.md (trailing space)
  -> lds-guide-graphql.md.

Why

• git clone on window fails No way to pull repository with the last version #41

Notes

@W-21361802@

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Skills

Manual checklist

Description quality

• Describes what the skill does and the expected output
• Includes relevant Salesforce domain keywords (Apex, LWC, SOQL, metadata types, etc.)
• Trigger phrases are specific enough for Vibes to select this skill reliably

Instructions

• Clear goal statement
• Step-by-step workflow
• Validation rules for generated output
• Defined output / artifact

Context efficiency

• Core instructions are concise — supporting material lives in templates/, examples/, or docs/ subdirectories
• No unnecessary background explanation in the body

Automated checks

Enforced by CI (npm run validate:skills) per the Agent Skills spec:

• Directory is one level deep, named in kebab-case (max 64 chars), contains SKILL.md
• Frontmatter name matches directory name; description is present, ≥ 20 words, ≤ 1024 characters, and includes trigger language
• Body is non-empty and under 500 lines
• Name uses gerund form ⚠ (warning — does not block merge)