Launch Phase Pareto failure analysis

Find the weakest step in a procedure: Phase Pareto ranks phases by failures, retries, and duration so you target the real bottleneck instead of guessing.

• Added a Phase Pareto chart with Failures, Retries, and Duration views, each with previous-period trend badges
• Added phase-level filters for outcome, sample class (production / golden / failing), and full run and unit slicing, kept in sync between the sidebar and command bar
• Added a retry-count breakdown that surfaces phases churning through repeated attempts
• Improved the date filter to window on when each phase ran, not when its run started