fix(ui): refresh active project metadata after rename

[devswha]

Summary

• reconcile the active project with freshly fetched project metadata
• keep expanded session pages intact while applying a renamed display name
• add regression coverage for rename synchronization and expanded-session preservation

CUA reproduction

1. Select a project.
2. Rename it from the sidebar.
3. Before this fix, the sidebar changed immediately but the document title and active-project header retained the old name until the project was reselected.
4. With this fix, the sidebar and document title update together (CUA Project Fixed - Gajae Code App).

Verification

• node --import tsx --test src/hooks/useProjectsState.test.ts (7 passed)
• npm run typecheck
• npx eslint src/hooks/useProjectsState.ts src/hooks/useProjectsState.test.ts
• CUA: renamed selected project and confirmed title updated without reselection

[devswha]

CI reaches only the pre-existing npm audit gate and fails on 10 high-severity dependency findings before typecheck/tests. Tracked separately in #2. The focused regression test, full local typecheck, focused lint, and CUA rename scenario all pass.