feat: Implement comprehensive database schema and tRPC routers for clients, projects, tasks, checkpoints, and notes

- Established database schema with five tables using better-sqlite3 and drizzle-orm
- Developed tRPC routers for clients, projects, tasks, checkpoints, and notes with full CRUD operations
- Integrated lazy initialization for electron-store to manage app settings
- Enhanced UI components for task management, including NewTaskDialog and GanttChart
- Implemented search and filter functionalities across various views
- Ensured type safety and strict TypeScript configurations throughout the codebase
- Documented learnings and best practices for future iterations in progress.txt

DEFAULT_PROMPT.md

@@ -0,0 +1,42 @@
+## Your Task
+
+1. Read the full app PRD at `prd-main.md` (in the same directory as this file)
+2. Read the PRD at `prd.json` (in the same directory as this file)
+3. Read the progress log at `progress.txt` (check Codebase Patterns section first)
+4. **DO YOUR JOB**
+5. Update the PRD to set `passes: true` for the completed story
+6. Append your progress to `progress.txt`
+
+## Progress Report Format
+
+APPEND to progress.txt (never replace, always append):
+```
+## [Date/Time] - [Story ID]
+- What was implemented
+- Files changed
+- **Learnings for future iterations:**
+  - Patterns discovered (e.g., "this codebase uses X for Y")
+  - Gotchas encountered (e.g., "don't forget to update Z when changing W")
+  - Useful context (e.g., "the evaluation panel is in component X")
+---
+```
+
+## USER REQUEST
+{
+  "id": "US-014",
+  "title": "Kanban board in Project Detail",
+  "description": "As a user, I want a Kanban board inside the project detail view with drag-and-drop task management between status columns.",
+  "acceptanceCriteria": [
+    "@hello-pangea/dnd installed; DragDropContext wraps 3 Droppable columns: To Do | In Progress | Completed",
+    "Each task card is a Draggable wrapped in a shadcn/ui Card rendering: title, description (truncated), priority as shadcn/ui Badge, due date chip, assignee string",
+    "Dragging a card to another column calls tasks.update({ id, status }) via tRPC and the UI updates immediately (optimistic or on success)",
+    "'+ Add' shadcn/ui Button (variant=ghost, size=sm) in each column header opens the shadcn/ui Dialog new-task modal with the column's status pre-selected",
+    "Columns show a task count in their header using shadcn/ui Badge (variant=secondary)",
+    "All card content uses shadcn/ui primitives: Card, Badge, Button (already installed)",
+    "Typecheck passes",
+    "Verify in browser using dev-browser skill"
+  ],
+  "priority": 14,
+  "passes": false,
+  "notes": ""
+}