Same fixes as feature/next 99576e6, brought into v1.58.0 (the user fixes the
released line directly while it has few users):
- Current node's model picker repaints the chosen card in place instead of
redrawing the grid, which scrolled back to the top.
- The classic combo editor no longer saves when its bilingual tags are shown nor
once per translated tag; one save follows the last translation.
- A long activity before/after pair is cut around its first difference.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>