Hotfix projects home when pin_order is unavailable

[dtrn2048]

Summary

• make /api/projects/home fall back to a query without pin_order when testing Directus rejects that field
• keep the projects list visible even if pinned projects cannot be loaded
• add a regression test for the fallback path

Root cause

Testing started returning empty project lists because the new projects-home BFF queried project.pin_order, but testing Directus rejected that field. The endpoint swallowed the failed list query and returned empty arrays while a separate count query still returned the correct total.

Verification

• uv run ruff check dembrane/api/project.py tests/api/test_projects_home.py
• uv run ruff format --check dembrane/api/project.py tests/api/test_projects_home.py
• uv run pytest tests/api/test_projects_home.py tests/api/test_chat_agentic_mode.py -q

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