Bump version to 1.19.2-alpha.0 for next alpha pre-release

[Copilot]

This PR bumps the extension version from 1.19.1 to 1.19.2-alpha.0 using npm version prepatch --preid=alpha to prepare for the next alpha pre-release.

Changes Made

• Updated package.json version field from 1.19.1 to 1.19.2-alpha.0
• Updated package-lock.json to reflect the new version
• Created git tag v1.19.2-alpha.0 automatically via npm version command

What Was Not Changed

• No modifications to main.js or tsconfig.json as required
• No dependency upgrades or package updates
• No functional code changes
• All existing functionality preserved

Verification

• ✅ Linting passes without errors
• ✅ Build completes successfully
• ✅ CodeQL security analysis shows no vulnerabilities
• ✅ Only package.json and package-lock.json were modified
• ✅ Version follows semantic versioning conventions for alpha pre-releases

This minimal change prepares the extension for alpha testing and follows the standard npm versioning workflow for pre-release versions.

Original prompt

Run npm version prepatch --preid=alpha to bump the version to the next alpha pre-release version.

Requirements:

• Only modify package.json and package-lock.json files
• Do not change main.js or tsconfig.json files - if any changes were made to these files, revert them
• Do not upgrade any other dependencies
• Fix any build or lint errors that result from the version change
• Make only the necessary changes for the version bump

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