feat(M14): 3-pane backlog — generic SplitPane, BacklogStore, SSE realtime, card-grid TaskPanel (#22)
* feat(split-pane): refactor to generic n-pane SplitPane with cookie persistence New API: panes[], defaultSplit[], cookieKey, tabLabels. Supports arbitrary number of panes with n-1 draggable dividers and JSON cookie persistence. Replaces TriplePane; mobile renders tabs. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com> * feat(split-pane): migrate callers to new panes[] API Backlog page and sprint board now use generic SplitPane. TriplePane removed; sprint board uses 3-pane with defaultSplit=[28,35,37]. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com> * test(split-pane): add unit tests for 2/3-pane, cookie-restore, mobile tabs Added jsdom + @testing-library/react devDeps for component testing. 7 cases: render, divider count, cookie restore, invalid cookie fallback, mobile tab render/switch, and no-dividers-on-mobile. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com> * feat(backlog): add BacklogStore Zustand store with applyChange reducer State: pbis, storiesByPbi, tasksByStory. setInitialData for server hydration; applyChange(entity, op, data) handles I/U/D for SSE events. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com> * feat(backlog): server-fetch tasks + hydrate BacklogStore on page load Page now fetches tasks parallel to stories and groups by story_id. BacklogHydrationWrapper calls setInitialData on mount so the store is ready for downstream SSE consumers. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com> * feat(backlog): add EmptyPanel shared component, replace inline empty states EmptyPanel takes title?, message, and optional action with DemoTooltip. Replaces duplicate inline empty-state markup in pbi-list and story-panel. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com> * feat(backlog): add TaskPanel with sortable rows and TaskDialog wiring Reads selectedStoryId + tasksByStory from stores. DnD reorder via reorderTasksAction. Row click → ?editTask, + button → ?newTask&storyId. DemoTooltip on drag handles and + button. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com> * feat(backlog): wire TaskPanel + TaskDialog into backlog page 3-pane SplitPane [20,45,35]. searchParams for newTask/editTask. TaskDialog and EditTaskLoader render on ?newTask and ?editTask. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com> * test(backlog): add TaskPanel tests for render states and click handlers 7 cases: no-story empty, no-tasks empty+action, tasks render, + button router.push, row click router.push, demo disabled button, demo disabled handles. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com> * feat(backlog): migrate PbiList to store-driven via useBacklogStore Removes pbis prop; reads from useBacklogStore(s => s.pbis) so SSE updates reflect in real-time without prop drilling. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com> * feat(backlog): migrate StoryPanel to store-driven + selectStory on click Removes storiesByPbi prop; reads from useBacklogStore. Card click now dispatches selectStory(id) + shows isSelected highlight. Edit moved to inline pencil button. page.tsx drops pbis/storiesByPbi props. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com> * test(backlog): add 3-pane integration tests for click-cascade flow Covers: empty states, PBI→stories, story→tasks, cascade-reset, isSelected highlight. localStorage mocked for sort-mode persistence. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com> * feat(ST-1115): SSE backlog realtime — endpoint, hook, hydration mount, tests Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com> * feat(ST-1116): mobile auto-switch tabs + back button in BacklogSplitPane Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com> * docs(ST-1116): update functional-spec (3-pane backlog + mobile) and architecture (backlog SSE + backlog-store) Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com> * feat(ST-1117): TaskPanel card-grid — BacklogCard + rectSortingStrategy, tests updated Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com> * fix(tests): correct PbiStatusApi type and remove duplicate mock keys Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com> --------- Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>
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__tests__/components/backlog/backlog-split-pane.test.tsx
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__tests__/components/backlog/backlog-split-pane.test.tsx
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// @vitest-environment jsdom
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import { describe, it, expect, beforeEach } from 'vitest'
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import { render, screen } from '@testing-library/react'
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import { useSelectionStore } from '@/stores/selection-store'
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import { BacklogSplitPane } from '@/components/backlog/backlog-split-pane'
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const PANES = [
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<div key="a">PBI pane</div>,
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<div key="b">Stories pane</div>,
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<div key="c">Tasks pane</div>,
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]
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function renderPane() {
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return render(
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<BacklogSplitPane
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panes={PANES}
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defaultSplit={[33, 33, 34]}
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cookieKey="test-backlog"
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tabLabels={["PBI's", 'Stories', 'Taken']}
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/>
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)
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}
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beforeEach(() => {
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useSelectionStore.setState({ selectedPbiId: null, selectedStoryId: null })
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// Force mobile viewport
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Object.defineProperty(window, 'innerWidth', { writable: true, configurable: true, value: 600 })
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window.dispatchEvent(new Event('resize'))
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})
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describe('BacklogSplitPane auto-switch', () => {
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it('starts on tab 0 with no selection', () => {
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renderPane()
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expect(screen.getByText('PBI pane')).toBeTruthy()
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expect(screen.queryByText('Stories pane')).toBeNull()
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})
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it('auto-switches to tab 1 when PBI is selected', () => {
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const { rerender } = renderPane()
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useSelectionStore.setState({ selectedPbiId: 'pbi-1', selectedStoryId: null })
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rerender(
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<BacklogSplitPane
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panes={PANES}
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defaultSplit={[33, 33, 34]}
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cookieKey="test-backlog"
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tabLabels={["PBI's", 'Stories', 'Taken']}
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/>
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)
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expect(screen.getByText('Stories pane')).toBeTruthy()
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expect(screen.queryByText('PBI pane')).toBeNull()
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})
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it('auto-switches to tab 2 when story is selected', () => {
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const { rerender } = renderPane()
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useSelectionStore.setState({ selectedPbiId: 'pbi-1', selectedStoryId: 'story-1' })
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rerender(
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<BacklogSplitPane
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panes={PANES}
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defaultSplit={[33, 33, 34]}
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cookieKey="test-backlog"
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tabLabels={["PBI's", 'Stories', 'Taken']}
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/>
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)
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expect(screen.getByText('Tasks pane')).toBeTruthy()
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expect(screen.queryByText('PBI pane')).toBeNull()
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})
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it('switches to tab 1 on cascade-reset (story cleared when new PBI selected)', () => {
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// Start with story selected (tab 2)
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useSelectionStore.setState({ selectedPbiId: 'pbi-1', selectedStoryId: 'story-1' })
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const { rerender } = renderPane()
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// Cascade-reset: new PBI → story clears
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useSelectionStore.setState({ selectedPbiId: 'pbi-2', selectedStoryId: null })
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rerender(
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<BacklogSplitPane
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panes={PANES}
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defaultSplit={[33, 33, 34]}
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cookieKey="test-backlog"
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tabLabels={["PBI's", 'Stories', 'Taken']}
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/>
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)
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expect(screen.getByText('Stories pane')).toBeTruthy()
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})
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})
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