Fix: Immediate task switcher visibility and hidden sandbox during runs

docs: evidence proof above graphs, overlay fix, M2M section, logs fix

Clear stale UI when HF Space sleeps or backend disconnects

Fix RCA showing same for all tasks: reset per-task state on task transition

Fix UI scroll/layout, SLA/budget tracking, counterfactual, sandbox status; add demo guide and local model sections to docs

Add inference logs to HF Logs tab and fix idle timer/budget drift

Initial Space deployment with llama-cpp + React dashboard