Left Panel: Baryonic mass vs. equatorial radius. Dotted and dot-dashed curves indicate lines of constant angular momentum and constant frequency, respectively. The dashed black line highlights the points of maximum stability in the hadronic branches, signaling the onset of a phase transition (PT). Thin, horizontal magenta lines show trajectories where angular momentum (J) and baryonic mass (M_b) are conserved. The thick magenta curve connects points on the hybrid star branches that can be reached through a collapse conserving both J and M_b. Right Panel: Similar to the left panel, but with the y-axis representing gravitational mass. Star markers denote the endpoint trajectories for direct (M2) and delayed (M3) collapse models. The arrows are inclined because gravitational mass, unlike baryonic mass, is not conserved during the PT.