refactor: complete v2 refactoring plan (Phases 1-5)

Phase 1 — Quick Wins: centralize formatMoney/formatCents, extract
findUniqueOrThrow helper (19 routers), shared Prisma select constants,
useInvalidatePlanningViews hook, status badge consolidation, composite
DB indexes.

Phase 2 — Timeline Split: extract TimelineContext, TimelineResourcePanel,
TimelineProjectPanel; split 28-dep useMemo into 3 focused memos.
TimelineView.tsx reduced from 1,903 to 538 lines.

Phase 3 — Query Performance: server-side filtering for getEntriesView,
remove availability from timeline resource select, SSE event debouncing
(50ms batch window).

Phase 4 — Estimate Workspace: extract 7 tab components and 3 editor
components. EstimateWorkspaceClient 1,298→306 lines,
EstimateWorkspaceDraftEditor 1,205→581 lines.

Phase 5 — Package Cleanup: split commit-dispo-import-batch (1,112→573
lines), extract shared pagination helper with 11 tests.

All tests pass: 209 API, 254 engine, 67 application.

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

packages/api/src/router/staffing.ts

@@ -2,6 +2,7 @@ import { analyzeUtilization, findCapacityWindows, rankResources } from "@planarc
 import { listAssignmentBookings } from "@planarchy/application";
 import { TRPCError } from "@trpc/server";
 import { z } from "zod";
+import { findUniqueOrThrow } from "../db/helpers.js";
 import { createTRPCRouter, protectedProcedure } from "../trpc.js";
 
 export const staffingRouter = createTRPCRouter({
@@ -108,19 +109,18 @@ export const staffingRouter = createTRPCRouter({
       }),
     )
     .query(async ({ ctx, input }) => {
-      const resource = await ctx.db.resource.findUnique({
-        where: { id: input.resourceId },
-        select: {
-          id: true,
-          displayName: true,
-          chargeabilityTarget: true,
-          availability: true,
-        },
-      });
-
-      if (!resource) {
-        throw new TRPCError({ code: "NOT_FOUND", message: "Resource not found" });
-      }
+      const resource = await findUniqueOrThrow(
+        ctx.db.resource.findUnique({
+          where: { id: input.resourceId },
+          select: {
+            id: true,
+            displayName: true,
+            chargeabilityTarget: true,
+            availability: true,
+          },
+        }),
+        "Resource",
+      );
 
       const resourceBookings = await listAssignmentBookings(ctx.db, {
         startDate: input.startDate,
@@ -161,18 +161,17 @@ export const staffingRouter = createTRPCRouter({
       }),
     )
     .query(async ({ ctx, input }) => {
-      const resource = await ctx.db.resource.findUnique({
-        where: { id: input.resourceId },
-        select: {
-          id: true,
-          displayName: true,
-          availability: true,
-        },
-      });
-
-      if (!resource) {
-        throw new TRPCError({ code: "NOT_FOUND", message: "Resource not found" });
-      }
+      const resource = await findUniqueOrThrow(
+        ctx.db.resource.findUnique({
+          where: { id: input.resourceId },
+          select: {
+            id: true,
+            displayName: true,
+            availability: true,
+          },
+        }),
+        "Resource",
+      );
 
       const resourceBookings = await listAssignmentBookings(ctx.db, {
         startDate: input.startDate,