fix(scripts): add --no-dependencies to publish:vsce and use pnpm exec

[phine-apps]

Summary

• Fixes publish:vsce script by adding --no-dependencies flag so vsce does not fail on pnpm symlinked node_modules (ELSPROBLEMS error during npm list).
• Updates package and publish:vsce scripts to explicitly use pnpm exec for consistency with publish:ovsx.

Details

• Since runtime dependencies are bundled into out/extension.js via esbuild and node_modules/ is excluded in .vscodeignore, bundling node_modules during packaging/publishing is unnecessary.
• Adding --no-dependencies allows pnpm run publish:vsce to publish successfully in pnpm workspace setups.

Testing

• Verified pnpm run package completes successfully and produces valid VSIX.
• Verified pnpm run lint and pnpm run test:unit pass (199 tests).