Capital Planning: add Unscheduled bucket for imported projects without target_year

Projects imported via CSV that lack a target_year were invisible in Capital
Planning because findForPlanning() filtered on target_year IS NOT NULL. This
removes that filter and adds an "Unscheduled" Kanban column (orange background,
2-col layout) so users can drag unscheduled projects into year buckets.
Also bumps app version to 2026.3.2 (beta).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

backend/package.json

@@ -1,6 +1,6 @@
 {
   "name": "hoa-ledgeriq-backend",
-  "version": "0.2.0",
+  "version": "2026.3.2-beta",
   "description": "HOA LedgerIQ - Backend API",
   "private": true,
   "scripts": {