setup electron app with boilerplate

CLAUDE.md

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+# Project Rules
+
+## Electron App
+### Quality
+We care about overall architectural quality and keeping consistent patterns according to best practices.
+
+As an example, we have as high of a bar as a product team like Linear, which outputs high quality software. Let's avoid slop at all costs.
+
+### Package Manager
+- Use **yarn** (not npm) for all dependency management