feat: add Pomodoro timer functionality with logging and project goals

- Implemented Pomodoro timer in the app, allowing users to start, pause, and stop sessions.
- Added context for managing Pomodoro state and actions.
- Integrated time logging for completed sessions to track productivity.
- Enhanced project settings to include time goals and Pomodoro settings.
- Created migration scripts to update the database schema for new project fields and time logs.
- Updated UI components to display Pomodoro controls and project time summaries.
- Added category filtering for projects in the project list view.

backend/app/main.py

@@ -159,6 +159,32 @@ def delete_task(task_id: int, db: Session = Depends(get_db)):
     return None
 
 
+# ========== TIME LOG ENDPOINTS ==========
+
+@app.post("/api/tasks/{task_id}/time-logs", response_model=schemas.TimeLog, status_code=201)
+def log_time(task_id: int, time_log: schemas.TimeLogCreate, db: Session = Depends(get_db)):
+    """Log time spent on a task"""
+    if not crud.get_task(db, task_id):
+        raise HTTPException(status_code=404, detail="Task not found")
+    return crud.create_time_log(db, task_id, time_log)
+
+
+@app.get("/api/tasks/{task_id}/time-logs", response_model=List[schemas.TimeLog])
+def get_time_logs(task_id: int, db: Session = Depends(get_db)):
+    """Get all time logs for a task"""
+    if not crud.get_task(db, task_id):
+        raise HTTPException(status_code=404, detail="Task not found")
+    return crud.get_time_logs_by_task(db, task_id)
+
+
+@app.get("/api/projects/{project_id}/time-summary", response_model=schemas.ProjectTimeSummary)
+def get_project_time_summary(project_id: int, db: Session = Depends(get_db)):
+    """Get aggregated time statistics for a project"""
+    if not crud.get_project(db, project_id):
+        raise HTTPException(status_code=404, detail="Project not found")
+    return crud.get_project_time_summary(db, project_id)
+
+
 # ========== SEARCH ENDPOINT ==========
 
 @app.get("/api/search", response_model=List[schemas.Task])