Models page redesign: tabs (Required/Recommended/Installed) with a multi-column card grid, required models (memory curator + embeddings) surfaced first and gating the rest until both are installed. Adds a qwen2.5:14b tier to the hardware-fit catalog for high-VRAM machines. Installer and restore messaging updated to match. Also declares pytest in requirements-base.txt so bin/check.sh's test suite is reproducible on a fresh venv. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>