Improve settings search recommendations

[adibhanna]

Summary

• Add setting-level search metadata for the Settings modal.
• Render matched setting names in the settings search sidebar, with the parent section shown as context.
• Jump to the selected setting when a recommendation is clicked and highlight the target for two seconds.
• Add a regression test proving wrap returns Word wrap instead of only the Editor section.

Why

Fixes #31 and fixes #32. The previous settings search only filtered top-level sections, so matching a specific setting surfaced the section/type name instead of the actual setting. Clicking a result also did not move the user to the actual control.

Validation

• npm run test:run --workspace @zennotes/app-core
• npm run typecheck --workspace @zennotes/app-core
• npm run typecheck --workspace @zennotes/desktop
• npm run typecheck --workspace @zennotes/web
• npm run build:nocheck --workspace @zennotes/web