UpgradeDialog was reading 'currentPlan.stripe_yearly_price_id' from
'auth.plan', but auth.plan is built by AuthPlanResource which only
exposes {id, slug, name, interval} — the price ids are absent. The
'isOnYearly' computation always compared against undefined and returned
false, so users on a yearly subscription saw the dialog as if they were
on monthly: no current-plan badge match, the toggle was forced visible,
and the wrong price/billing label was shown.
Switches both UpgradeDialog and the Billing settings page to read
auth.plan.interval directly (the authoritative field already present
in shared props), drops the now-unused 'currentPriceId' from the Inertia
middleware and the Auth type. Yearly is now the default selection on
dialog open and the toggle stays visible regardless of current cadence.
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