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>

packages/api/src/router/role.ts

@@ -3,6 +3,7 @@ import { CreateRoleSchema, PermissionKey, UpdateRoleSchema } from "@planarchy/sh
 import { TRPCError } from "@trpc/server";
 import { z } from "zod";
 import { findUniqueOrThrow } from "../db/helpers.js";
+import { RESOURCE_BRIEF_SELECT } from "../db/selects.js";
 import { emitRoleCreated, emitRoleDeleted, emitRoleUpdated } from "../sse/event-bus.js";
 import { createTRPCRouter, managerProcedure, protectedProcedure, requirePermission } from "../trpc.js";
 
@@ -89,7 +90,7 @@ export const roleRouter = createTRPCRouter({
             _count: { select: { resourceRoles: true } },
             resourceRoles: {
               include: {
-                resource: { select: { id: true, displayName: true, eid: true } },
+                resource: { select: RESOURCE_BRIEF_SELECT },
               },
             },
           },