fix: improve mobile responsiveness for task/kanban pages
- KanbanBoard: responsive grid (1 col mobile, 2 col tablet, 4 col desktop)
- TaskModal: bottom-sheet style on mobile with scroll, touch-friendly close
- Touch targets: enforce 44px minimum on all interactive elements (buttons,
checkboxes, kebab menus, add buttons, view tabs)
- TabloTasksSection: responsive padding and stacking header layout
- DashboardTaskList: simplified mobile grid hiding non-essential columns
- InlineTaskCreate: larger touch targets on action buttons
Co-Authored-By: Claude Sonnet 4.6 (1M context) <noreply@anthropic.com>
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