Mikhail Chusavitin f448111e77 fix: block renaming main project variant; dynamic page titles ...

- Add ErrCannotRenameMainVariant; ProjectService.Update now returns
  this error if the caller tries to change the Variant of a main
  project (empty Variant) — ensures there is always exactly one main
- Handle ErrCannotRenameMainVariant in PUT /api/projects/:uuid with 400
- Set document.title dynamically from breadcrumb data:
  - Configurator: "CODE / variant / Config name — QuoteForge"
  - Project detail: "CODE / variant — QuoteForge"

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

2026-03-24 17:29:02 +03:00

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