Sweep of frontend/src/* for the proceeding-code rename landed by
mig 096. Same scope as the Go sweep — comments + literal string
codes substituted, plus the visible additions:
- fristenrechner.tsx / verfahrensablauf.tsx UPC_TYPES gain
upc.ccr.cfi as a fourth UPC option ("Widerklage auf Nichtigkeit");
it surfaces in the picker and renders the determinator routing
notice from proceeding_mapping.ResolveCounterclaimRouting.
- i18n.ts deadlines.* keys renamed to mirror the new codes exactly
(`deadlines.upc.inf.cfi`, …). DE + EN sides in sync.
- frontend/src/client/fristenrechner.ts fristenrechnerCodeToCascadeSegment
rekeyed to new codes; upc.ccr.cfi shares the upc-inf kebab segment
because the event_categories slug taxonomy is not renamed and ccr
resolves to inf-rules anyway.
- client/views/verfahrensablauf-core.ts court-picker conditions
rewritten against the new codes.
Bun build clean (i18n-keys.ts regenerated from the canonical map).