doberkofler / gantt-renderer / 25788231977 / 1

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feat(gantt): add onExpandCollapse/onExpandCollapseAll callbacks and header +/− controls

- Add OnExpandCollapse and OnExpandCollapseAll callback types with per-task and bulk payloads
- Wire single-row toggle callback and bulk expandAll/collapseAll callbacks
- Render expand/collapse all buttons inline in the left pane header
- Add expandAllTitle/collapseAllTitle locale keys (English fallback for all 43 locales)
- Remove demo toolbar collapse/expand buttons in favor of header controls
- Fix header button positioning to avoid overlapping Task name label
- Add unit, integration, and e2e tests for new callbacks and controls

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