🤖 fix: hide hidden entries in new project picker

[ibetitsmike]

Summary

• Remove hidden entries from the desktop system project directory picker so the new-project flow focuses on visible folders.
• Add Storybook test-runner Jest config to ignore the VS Code extension package and avoid haste-map collisions in CI.
• Stabilize the flaky ToolSelectorInteraction Storybook play-test by normalizing the initial tool-selection state before asserting None→All transitions.

Background

• The PR’s Storybook job failed for two reasons: a Jest haste-map collision (package.json name conflict with vscode/package.json) and a flaky interaction test that sometimes started with All enabled after Storybook remount retries.

Implementation

• Dropped Electron’s showHiddenFiles option in the project directory picker and documented the rationale inline.
• Added test-runner-jest.config.js that extends Storybook’s default Jest config and excludes vscode/ from module discovery.
• Updated App.projectSettings.stories.tsx to normalize the MCP tool selector into an "all selected" baseline before asserting button disabled states.

Validation

• make storybook-build
• make test-storybook
• make static-check

Risks

• Low: changes are limited to picker visibility and Storybook test setup/story behavior.

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