fix(web): retain markdown workspace ownership

R20 follow-up

Give inspector reasoning markdown its projected source thread and retain the explicit environment fallback for proposed plans without a thread reference. Workspace links and images now resolve through their owning environment after removal of the active-environment fallback.

Implemented by GPT-5.6 Sol via Codex.
0b9a275bddJulius Marminge committed on 9/5/2026, 4:54:28 AMparent54044e3
2 files changedLine totals unavailable