[codex] Build Azure DevOps Business Central time tracker

[dclawd88]

Summary

Addresses #1 by adding a packaged Azure DevOps work item form extension for Business Central time tracking.

What changed

• Added the Azure DevOps extension manifest, build pipeline, TypeScript source, static UI, styling, and image assets.
• Implemented Microsoft Entra OAuth 2.0 with PKCE for Business Central access without storing a client secret in browser code.
• Added Business Central API helpers for employee lookup, time entry creation, and work-item-linked history using an ADO Work Item #<id> marker.
• Added local storage for extension settings, token state, PKCE state, and recent entry references.
• Added user documentation, privacy notice, terms, validation tests, and VSIX packaging support.

Validation

• npm run validate
• npm run package
• npm audit --omit=dev
• Local browser smoke test of dist/time-tracker.html: page loaded, settings saved, default job number propagated, and unauthenticated submission was blocked with the expected connection message.