Performance chart under positions; remove obsolete files

- PerfChart moves into the left column under Open Positions
  (half-width), balancing the radar column.

Cleanup:
- Design mockup pages (DesignMockups / DesignHorizon / DesignOrbit)
  and their routes removed - the redesign has shipped; the mockups
  live on in git history. Main bundle shrinks ~97 kB and the
  chunk-size warning goes away.
- frontend/tsconfig.tsbuildinfo untracked and gitignored (incremental
  build artifact that churned in every commit).
- Dead npm test / test:watch scripts removed - vitest was never a
  dependency; CI already skips the step via its vitest guard.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

.gitignore

@@ -27,6 +27,7 @@ Thumbs.db
 # Frontend
 frontend/node_modules/
 frontend/dist/
+frontend/tsconfig.tsbuildinfo
 
 # Alembic
 alembic/versions/__pycache__/