refactor: consolidate duplicated code across web and API packages

- Extract shared render helpers (vacation blocks, range overlay, overbooking blink) into renderHelpers.tsx
- Centralize status badge styles and vacation color maps into status-styles.ts
- Extract dragMath.ts utility from useTimelineDrag for reuse
- Split useInvalidatePlanningViews into useInvalidateTimeline (4 queries) + useInvalidatePlanningViews (8 queries)
- Adopt findUniqueOrThrow() and Prisma select constants across API routers
- Add shared fmtEur() helper for API-side money formatting
- Wrap TimelineResourcePanel and TimelineProjectPanel with React.memo
- Fix pre-existing TS2589 deep type errors in TeamCalendar and VacationModal
- 38 files changed, reducing ~400 lines of duplicated code

Co-Authored-By: claude-flow <ruv@ruv.net>

apps/web/src/components/vacations/VacationModal.tsx

@@ -7,16 +7,10 @@ import { trpc } from "~/lib/trpc/client.js";
 import { DateInput } from "~/components/ui/DateInput.js";
 import { useDebounce } from "~/hooks/useDebounce.js";
 import { InfoTooltip } from "~/components/ui/InfoTooltip.js";
+import { VACATION_TYPE_LABELS } from "~/lib/status-styles.js";
 
 const VACATION_TYPES = Object.values(VacationType);
 
-const VACATION_TYPE_LABELS: Record<VacationType, string> = {
-  ANNUAL: "Annual Leave",
-  SICK: "Sick Leave",
-  PUBLIC_HOLIDAY: "Public Holiday",
-  OTHER: "Other",
-};
-
 interface VacationModalProps {
   resourceId?: string;
   onClose: () => void;
@@ -118,7 +112,7 @@ export function VacationModal({ resourceId: initialResourceId, onClose, onSucces
   const inputClass =
     "w-full px-3 py-2 border border-gray-300 dark:border-gray-600 rounded-lg focus:outline-none focus:ring-2 focus:ring-brand-500 text-sm dark:bg-gray-900 dark:text-gray-100";
   const labelClass = "block text-sm font-medium text-gray-700 dark:text-gray-300 mb-1";
-  const resourceList = resources?.resources ?? [];
+  const resourceList: { id: string; displayName: string; eid: string }[] = resources?.resources ?? [];
 
   return (
     <div