Add Copilot instructions for repository

.github/copilot-instructions.md

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+# Obsidian Kanban Bases View Plugin - Copilot Instructions
+
+## Repository Overview
+
+This is an **Obsidian plugin** that provides a **kanban board view** for Obsidian Bases (database functionality). The plugin integrates with Obsidian's Bases API to display data in a drag-and-drop kanban board layout with configurable grouping, virtual scrolling, and persistent column ordering.
+
+**Key Technologies:**
+- TypeScript (strict mode enabled)
+- React 19.2.0 with JSX
+- Vite for building
+- Vitest for testing
+- @dnd-kit for drag-and-drop
+- @tanstack/react-virtual for virtual scrolling
+
+## Build, Test, and Lint Commands
+
+### Package Manager
+**CRITICAL: Always use `pnpm` for package management, not npm.** The project uses pnpm workspaces and npm will timeout.
+
+### Installation
+```bash
+pnpm install --frozen-lockfile
+```
+
+### Development
+```bash
+# Using mise (preferred for local development)
+mise run dev
+
+# Manual build with watch mode
+pnpm vite build --watch
+```
+
+### Building
+```bash
+# Production build
+pnpm vite build --mode production
+
+# Development build
+pnpm vite build
+```
+
+### Type Checking
+```bash
+tsc -noEmit
+```
+
+### Testing
+```bash
+# Run all tests
+vitest run
+
+# Run tests in watch mode
+vitest watch
+
+# Run tests with coverage
+vitest run --coverage
+
+# Run specific test file
+vitest run src/__tests__/KanbanBoard.test.tsx
+```
+
+### Linting
+```bash
+# Check for linting errors
+eslint src --ext .ts,.tsx
+
+# Auto-fix linting errors (if possible)
+eslint src --ext .ts,.tsx --fix
+```
+
+### Full Check Suite
+```bash
+# Run all checks (typecheck, lint, test)
+mise run check
+```
+
+Note: The `mise run check` command requires `VAULT_PATH` environment variable to be set to a valid Obsidian vault directory.
+
+## Project Structure
+
+```
+obsidian-bases-kanban-view/
+├── .github/              # GitHub workflows and configurations
+│   ├── workflows/        # CI/CD workflows (PR checks, releases)
+│   └── copilot-instructions.md  # This file
+├── .mise/                # Mise task definitions
+│   └── tasks/            # Build automation scripts
+├── src/
+│   ├── main.ts           # Plugin entry point, registers with Obsidian Bases API
+│   ├── views/
+│   │   └── KanbanBasesView.ts  # Core kanban board (523 lines) - drag-drop, grouping, virtual scrolling
+│   ├── components/       # React components for kanban board UI
+│   ├── utils/
+│   │   └── VirtualScroller.ts  # Virtual scrolling implementation (99 lines)
+│   ├── context/          # React context providers
+│   ├── hooks/            # Custom React hooks
+│   ├── styles/
+│   │   └── kanban.css    # Card/column styling and drag-drop states (150+ lines)
+│   └── __tests__/        # Test files (vitest + testing-library)
+├── docs/                 # Documentation
+├── manifest.json         # Obsidian plugin manifest
+├── package.json          # Dependencies and scripts
+├── tsconfig.json         # TypeScript configuration (strict: true)
+├── vite.config.mjs       # Vite build configuration
+├── vitest.config.mjs     # Vitest test configuration
+└── AGENTS.md             # Agent-specific development guidelines
+```
+
+## Key Architecture
+
+### Plugin Entry Point
+- **`src/main.ts`**: Registers the plugin with Obsidian's Bases API, defines the custom view type
+
+### Core View
+- **`src/views/KanbanBasesView.ts`**: Main kanban board implementation
+  - Manages data flow: `this.data.data` → grouped by `groupByPropertyId` → rendered
+  - Handles drag-drop operations for cards and columns
+  - Implements virtual scrolling for columns with 30+ items
+  - Manual grouping (no API support yet)
+
+### Virtual Scrolling
+- **`src/utils/VirtualScroller.ts`**: Renders only visible cards in columns for performance
+  - Uses @tanstack/react-virtual
+  - Critical for handling 100+ items
+
+### Styling
+- **`src/styles/kanban.css`**: Card/column styling, drag-drop visual feedback
+
+### Data Flow
+```
+Base data → KanbanBasesView → Grouped by property → Virtual Scroller → Rendered cards
+```
+
+## Code Style & Conventions
+
+### TypeScript
+- **Strict mode enabled** (`strict: true` in tsconfig.json)
+- All functions **must have explicit return types**
+- Private methods use underscore prefix: `_methodName()`
+- No `any` types - use proper TypeScript types
+- Use `const` and `let` (never `var`)
+
+### Imports
+Organize imports in this order:
+1. Obsidian library imports
+2. Local utility imports
+3. CSS imports
+
+Always use **named imports**, not default imports.
+
+```typescript
+// Good
+import { Plugin, TFile } from 'obsidian';
+import { VirtualScroller } from './utils/VirtualScroller';
+import './styles/kanban.css';
+
+// Bad
+import * as obsidian from 'obsidian';
+```
+
+### Formatting
+- **2-space indentation** (no tabs)
+- **Semicolons required**
+- **No trailing commas**
+- Use arrow functions for callbacks
+
+### Naming Conventions
+- **Classes**: PascalCase (e.g., `KanbanBasesView`)
+- **Methods/Properties**: camelCase (e.g., `updateColumnOrder`)
+- **Constants**: UPPER_SNAKE_CASE (e.g., `KANBAN_VIEW_TYPE`)
+- **Private methods**: underscore prefix (e.g., `_initializeView`)
+
+### Error Handling
+- Wrap data access in try-catch for localStorage/JSON parsing
+- Always check for null/undefined before accessing properties
+- Log errors with `[KanbanBasesView]` prefix for easy filtering
+
+```typescript
+try {
+  const data = JSON.parse(localStorage.getItem('key'));
+  if (data?.property) {
+    // Safe to use
+  }
+} catch (error) {
+  console.error('[KanbanBasesView] Failed to parse data:', error);
+}
+```
+
+### Logging
+- Use `console.debug()` for debugging information
+- Use `console.warn()` for warnings
+- Use `console.error()` for errors
+- Always prefix with `[KanbanBasesView]` for easy filtering
+- Log meaningful state during operations (see `src/views/KanbanBasesView.ts` lines 75-79 as reference)
+
+```typescript
+console.debug('[KanbanBasesView] Initializing with data:', this.data);
+console.warn('[KanbanBasesView] No grouping property found, using default');
+console.error('[KanbanBasesView] Failed to update entry:', error);
+```
+
+## Testing Guidelines
+
+### Test Framework
+- **Vitest** with happy-dom environment
+- **@testing-library/react** for component testing
+- Globals enabled (no need to import `describe`, `it`, `expect`)
+
+### Test Structure
+- Test files: `src/__tests__/**/*.test.ts` or `*.test.tsx`
+- Mock files: `src/__tests__/mocks/`
+- Setup: `src/__tests__/setup.ts`
+
+### Coverage Requirements
+- Lines: 80%
+- Functions: 80%
+- Branches: 80%
+- Statements: 80%
+
+### Writing Tests
+```typescript
+describe('ComponentName', () => {
+  it('should do something specific', () => {
+    // Arrange
+    const props = { /* ... */ };
+
+    // Act
+    const result = render(<Component {...props} />);
+
+    // Assert
+    expect(result.getByText('Expected Text')).toBeInTheDocument();
+  });
+});
+```
+
+### Running Tests
+- Run all tests: `vitest run`
+- Watch mode: `vitest watch`
+- Specific file: `vitest run path/to/test.test.tsx`
+- Coverage: `vitest run --coverage`
+
+## Development Workflow
+
+### Initial Setup
+1. Clone repository
+2. Run `pnpm install --frozen-lockfile`
+3. For local development with Obsidian:
+   - Run `mise run dev` (prompts for vault path on first run)
+   - Vault path stored in `.notes/VAULT_PATH` (gitignored)
+
+### Making Changes
+1. Create a feature branch
+2. Make minimal, focused changes
+3. Run `tsc -noEmit` to check types
+4. Run `vitest run` to ensure tests pass
+5. Run `eslint src --ext .ts,.tsx` to check linting
+6. Build: `pnpm vite build`
+
+### Testing Changes in Obsidian
+1. Build with `pnpm vite build --watch` or `mise run dev`
+2. Changes are symlinked to vault's `.obsidian/plugins/` directory
+3. Reload Obsidian (Windows: Ctrl+R, Mac: Cmd+R, or use Command Palette → "Reload app")
+4. Filter console logs by `[KanbanBasesView]` to debug
+
+### CI/CD
+- PR checks run on every pull request
+- Checks include: TypeScript compilation, linting, tests
+- Release automation via release-please
+
+## Known Limitations and Context
+
+### Not Yet Implemented
+- Property updates from drag-drop not persisted (see `updateEntryProperty()` stub in `KanbanBasesView.ts`)
+- Swimlanes (2D grouping)
+- Filter integration
+- Create/edit items inline
+- Keyboard navigation
+- Custom card templates
+- Using a note as the template for rendering cards
+
+### Technical Debt
+- Grouping is manual (no API support from Obsidian Bases yet)
+- Virtual scrolling optimization for very large datasets (1000+ items)
+
+### Obsidian API Integration
+- Plugin uses Obsidian Bases API (still evolving)
+- View registration: `this.registerView(KANBAN_VIEW_TYPE, ...)`
+- Data access: `this.data.data` from base view
+- Property updates: Waiting for stable API
+
+### Performance Considerations
+- Virtual scrolling kicks in for columns with 30+ items
+- Drag-drop operations are optimized with React memoization
+- Re-rendering minimized with proper React hooks dependencies
+
+## Agent-Specific Notes
+
+For more detailed agent-specific guidelines, see `AGENTS.md` in the repository root. That file contains:
+- Command usage (mise tasks)
+- Vault configuration details
+- Debugging tips with DevTools
+- Context & notes workflow for persistent agent memory
+
+## Common Tasks
+
+### Adding a New Feature
+1. Read relevant code in `src/views/KanbanBasesView.ts` to understand data flow
+2. Create React components in `src/components/`
+3. Add tests in `src/__tests__/`
+4. Update styles in `src/styles/kanban.css`
+5. Run full check suite: `mise run check`
+
+### Fixing a Bug
+1. Filter console for `[KanbanBasesView]` to identify error location
+2. Write a failing test first
+3. Fix the bug with minimal changes
+4. Ensure test passes and no other tests break
+5. Run `mise run check`
+
+### Updating Dependencies
+1. Use `pnpm add <package>` or `pnpm add -D <package>`
+2. Test thoroughly after updates
+3. Update `pnpm-lock.yaml` by running `pnpm install`
+4. Verify build still works: `pnpm vite build`
+
+## External Resources
+
+- [Obsidian Plugin API](https://github.com/obsidianmd/obsidian-api)
+- [Obsidian Bases Documentation](https://docs.obsidian.md/Plugins/Bases)
+- [React DnD Kit Documentation](https://docs.dndkit.com/)
+- [TanStack Virtual Documentation](https://tanstack.com/virtual/latest)
+
+## Questions or Issues?
+
+- Check console logs filtered by `[KanbanBasesView]`
+- Review existing tests for examples
+- See `AGENTS.md` for agent-specific debugging tips
+- File issues with reproduction steps and console errors