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/timeline/BatchAssignPopover.tsx

@@ -4,6 +4,7 @@ import { clsx } from "clsx";
 import { useEffect, useRef, useState } from "react";
 import { AllocationStatus } from "@planarchy/shared";
 import { trpc } from "~/lib/trpc/client.js";
+import { useInvalidateTimeline } from "~/hooks/useInvalidatePlanningViews.js";
 
 interface BatchAssignPopoverProps {
   resourceIds: string[];
@@ -29,7 +30,7 @@ export function BatchAssignPopover({
   onCreated,
 }: BatchAssignPopoverProps) {
   const ref = useRef<HTMLDivElement>(null);
-  const utils = trpc.useUtils();
+  const invalidateTimeline = useInvalidateTimeline();
 
   const [search, setSearch] = useState("");
   const [selectedProjectId, setSelectedProjectId] = useState<string | null>(
@@ -51,10 +52,7 @@ export function BatchAssignPopover({
 
   const batchMutation = trpc.timeline.batchQuickAssign.useMutation({
     onSuccess: () => {
-      void utils.timeline.getEntries.invalidate();
-      void utils.timeline.getEntriesView.invalidate();
-      void utils.timeline.getProjectContext.invalidate();
-      void utils.timeline.getBudgetStatus.invalidate();
+      invalidateTimeline();
       onCreated();
       onClose();
     },