Once every elective set is pinned, the Top Plans panel now renders the
user's completed selection as a single "Your Plan" card showing the
achievement count and pinned courses. Previously the panel went blank
because the all-pinned branch in useAppState cleared topPlans, even
though the spec strip was already showing the achievement.
Synthesizes a single PlanOutcome from pinnedAssignments +
optimizationResult.achieved + the priority scorer; TopPlans detects the
all-pinned state via ELECTIVE_SETS.every(...) and bypasses the
length>0 filter so a 0-spec completed plan still renders honestly.
