Add effective-date transaction filtering and bulk selection

backlog/tasks/task-4 - Add-selection-total-to-transactions.md

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+---
+id: TASK-4
+title: Add selection total to transactions
+status: In Progress
+assignee: []
+created_date: '2026-06-15 19:21'
+updated_date: '2026-06-15 19:24'
+labels: []
+dependencies: []
+priority: high
+ordinal: 4000
+---
+
+## Description
+
+<!-- SECTION:DESCRIPTION:BEGIN -->
+Add table selection controls on the transactions page so visible/filtered rows can be selected in bulk and the sum of selected transaction amounts is shown.
+<!-- SECTION:DESCRIPTION:END -->
+
+## Acceptance Criteria
+<!-- AC:BEGIN -->
+- [x] #1 A select-all control can select and clear all currently visible filtered transactions
+- [x] #2 Individual row selection continues to work alongside the select-all control
+- [x] #3 The UI displays the count and formatted euro total of selected transactions
+- [x] #4 Automated tests cover bulk selection and selected-total behavior
+<!-- AC:END -->
+
+## Implementation Plan
+
+<!-- SECTION:PLAN:BEGIN -->
+1. Inspect current transaction table selection behavior
+2. Add failing coverage for select-all and selected sum
+3. Implement visible-row bulk selection and selected total UI
+4. Run focused tests/build and update acceptance criteria
+<!-- SECTION:PLAN:END -->
+
+## Implementation Notes
+
+<!-- SECTION:NOTES:BEGIN -->
+Added failing Vitest coverage for visible bulk selection and selected totals, then implemented transactionsSelection helpers and wired TransactionsPage header checkbox plus selected count/sum. Focused test and build pass. Global lint currently fails on pre-existing unrelated lint errors in Convex/generated/UI files.
+<!-- SECTION:NOTES:END -->