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/src/modules/projects/projects.service.ts

@@ -20,7 +20,7 @@ export class ProjectsService {
 
   async findForPlanning() {
     const projects = await this.tenant.query(
-      'SELECT * FROM projects WHERE is_active = true AND target_year IS NOT NULL ORDER BY target_year, target_month NULLS LAST, priority',
+      'SELECT * FROM projects WHERE is_active = true ORDER BY target_year NULLS LAST, target_month NULLS LAST, priority',
     );
     return this.computeFunding(projects);
   }