docs: Add migration guide for Electron developers

[leaanthony]

Summary

• Created new migration guide for developers transitioning from Electron to Wails v3
• Covers architecture differences, feature mapping, and step-by-step migration process
• Includes code examples comparing Electron and Wails patterns
• Referenced in sidebar configuration but was missing

Quality Checklist

• Code examples verified against Wails API patterns
• Feature mapping covers main Electron → Wails equivalents
• Internal links resolve to real pages
• No hedging language or filler phrases
• Frontmatter complete with title, description, sidebar.order
• File structure follows Starlight conventions
• Callouts used sparingly and appropriately

Closes #17

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/17-from-electron-migration

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[github-actions]

⚠️ Missing Changelog Update

Hi @leaanthony, please update v3/UNRELEASED_CHANGELOG.md with a description of your changes.

This helps us keep track of changes for the next release.

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