Forward mode in the simulation tab now calls the durable /api/v1/forward
lifecycle instead of the single-pass /api/v1/simulation (which only differed
by a mode string). runSimulation branches to /api/v1/forward for forward mode,
loads runs on mount, and renders a forward panel listing each paper run with
its status (frozen/executed/marked/matured), non-PIT badge, holdings and a
Mark / Mature action per run. Frontend build passes (bundle index-INuvPOCF.js).
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