Bug & tweak sprint: fix financial calculations, add quarterly report, enhance dashboard

- Fix Accounts page: include investment accounts in Est. Monthly Interest calc,
  add Fund column to investment table, split summary cards into Operating/Reserve
- Fix Cash Flow: ending balance now respects includeInvestments toggle
- Fix Budget Manager: separate operating/reserve income in summary cards
- Fix Projects: default sort by planned_date instead of name
- Add Vendors: last_negotiated date field with migration, CSV import/export
- New Quarterly Financial Report: budget vs actuals, over-budget flagging, YTD
- Enhance Dashboard: separate Operating/Reserve fund cards, expanded Quick Stats
  with monthly interest, YTD interest earned, planned capital spend

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

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

@@ -7,7 +7,7 @@ export class ProjectsService {
 
   async findAll() {
     const projects = await this.tenant.query(
-      'SELECT * FROM projects WHERE is_active = true ORDER BY name',
+      'SELECT * FROM projects WHERE is_active = true ORDER BY planned_date NULLS LAST, target_year NULLS LAST, target_month NULLS LAST, name',
     );
     return this.computeFunding(projects);
   }