fix(web-ui): avoid recursive reload after lazy file tree load

[wgqqqqq]

Summary

• stop the file tree hook from triggering a full recursive reload immediately after a lazy root load succeeds
• only auto-reload when relevant file tree options actually change, and keep that reload in lazy mode when lazy loading is enabled
• preserve existing manual refresh, folder expansion, watcher refresh, and polling behavior

Problem

Opening a very large repository such as llvm-project could leave the Files panel stuck on loading because the initial lazy load was followed by an unconditional full recursive tree load.

Verification

• pnpm run build:web