Add three alternative views to the campaign planner canvas:
- Timeline: horizontal chronological layout with day columns and phase bars
- Platform: kanban columns grouped by platform with post cards
- Table: compact sortable table with status, platform, content, dates
View switcher in toolbar preserves canvas state when switching. Clicking
any post in alt views navigates back to canvas with that node selected
and centered. Keyboard shortcuts guarded to canvas-only view.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>