refactor: extract editor activation restore

[hhhjin]

Summary

• extract the editor activation restore logic into a dedicated utility
• cover pending-restore, path-change, and normal activation behavior with focused tests
• preserve the alias-switch guard while simplifying the activation effect in the editor component

Review

• review gate found no actionable issues in the reviewed scope

Testing

• pnpm lint:fix
• pnpm test:desktop

[gemini-code-assist]

Code Review

This pull request refactors the editor selection restoration logic into a dedicated utility function, restoreSelectionOnEditorActivate, and introduces unit tests for this logic. The review identifies a regression where the explicit editor focus call was omitted during the refactoring, which would negatively impact the user experience when opening notes. Additionally, there is a suggestion to improve type maintainability by using TypeScript's Parameters utility instead of duplicating the editor type definition.