feat: support beta/pre-release npm packages for tools

[Copilot]

Adds opt-in installation of pre-release (beta) npm dist-tag versions of registry tools, surfaced via a contextual button on the Tool Details page — similar to VS Code's "Switch to Pre-Release Version" pattern.

Changes

Type detection

• ToolRegistryEntry gains npmPackageName (populated from Supabase packagename column), propagated to the ToolDetail renderer type

npm registry check (toolRegistryManager.ts)

• checkBetaPackage(npmPackageName) — queries https://registry.npmjs.org/-/package/<name>/dist-tags for a beta tag; uses encodeURIComponent() for correct scoped-package encoding (@org/pkg → %40org%2Fkg); returns version string or null

Install flow (toolsManager.ts)

• installPrereleaseToolFromNpm(name) — installs <pkg>@beta via pnpm, loads using base name; distinct per-step error messages (install failure vs load failure)
• resolvePackageDirectoryName() — strips @tag/@version specifiers so versioned pnpm installs (e.g. pkg@beta) resolve to the correct node_modules/pkg directory; this also fixes the pre-existing debug-install bug for any versioned package spec

IPC / preload

• New CHECK_BETA_PACKAGE and INSTALL_PRERELEASE_TOOL channels wired through index.ts → preload.ts → ToolboxAPI

Tool Details UI (marketplaceManagement.ts)

• On panel open, checkAndShowPrereleaseButton() asynchronously checks beta availability and reveals an "Install Pre-Release Version (vX.Y.Z-beta.N)" button when a beta dist-tag exists
• Stale-tab guard: discards the result if the user navigated away before the API responded

Update check untouched — checkForUpdates() compares only against Supabase registry versions; beta packages are never surfaced as automatic updates

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• Use a meaningful title for the pull request.
• Follow the guidelines from the CONTRIBUTING.md.
• Test the change in your own code. (Compile and run)
• Resolve all GH Copilot comments.

[github-actions]

Bundle Size Report 📦

Bundle	Size
Main Process	972.86 KB
Renderer JS	551.68 KB
Renderer CSS	96.89 KB
Total	1.58 MB

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• 📊 Main Process: stats-main.html
• 📊 Renderer Process: stats-renderer.html

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