fix(windows): 修复项目菜单滚轮滚动迟缓

[Mucheen]

Summary

• Bind the existing WebView2 wheel helper to the actual project menu overflow container.
• Preserve pixel, line, and page wheel deltas while allowing boundary scroll chaining.
• Keep the workaround scoped to TitleProjectMenu so other dropdowns are unchanged.

Verification

• bun test src/ui/scroll-container-wheel.test.ts (5 passed)
• bun run typecheck
• bun run lint (existing warnings only)
• bun run build (existing dependency and chunk-size warnings only)
• Browser wheel check: deltaY 120 moved scrollTop from 0 to 120; the bottom-boundary event remained unconsumed.
• scripts/build-windows.ps1 -Configuration Release
• cargo test --manifest-path windows/tauri/src-tauri/Cargo.toml (71 passed)