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/project-planning-read-model.ts

@@ -44,6 +44,26 @@ export const PROJECT_PLANNING_ASSIGNMENT_INCLUDE = {
   roleEntity: PROJECT_PLANNING_ALLOCATION_INCLUDE.roleEntity,
 } as const;
 
+/**
+ * Lighter resource select for timeline rendering (hot path).
+ * Omits `availability` which is only needed for budget/cost calculations.
+ */
+const TIMELINE_RESOURCE_SELECT = {
+  select: {
+    id: true,
+    displayName: true,
+    eid: true,
+    chapter: true,
+    lcrCents: true,
+  },
+} as const;
+
+export const TIMELINE_ASSIGNMENT_INCLUDE = {
+  resource: TIMELINE_RESOURCE_SELECT,
+  project: PROJECT_PLANNING_ALLOCATION_INCLUDE.project,
+  roleEntity: PROJECT_PLANNING_ALLOCATION_INCLUDE.roleEntity,
+} as const;
+
 type ProjectPlanningReadDbClient = Pick<
   PrismaClient,
   "demandRequirement" | "assignment"